Special Notes and Alternate Allowances:
Mineral Wool Allowance- NFPA 285 tables for mineral wool are not available. For any listed insulation, mineral wool may be used as a replacement for combustible insulation.
No Insulation Allowance - NFPA 285 tables for no insulation are not available. Where the WRB is allowed over combustible insulation, those WRB’s allowed over the insulation may be used on the base-wall with no insulation.
- It is not permitted to remove insulation from a table – unless the table allows WRB over the insulation. In this case, when the insulation is removed, then that WRB over the insulation is to be used on the base wall surface.
- Do not use the WRB as listed on the base wall surface when removing the insulation to allow the WRB over the insulation.
- Adhere to the maximum air gap as stated within the approval when performing this process.
WRB Allowance - GCP PERM-A-BARRIER® or PERM-A-BARRIER® Ultra may replace any WRB shown since this WRB is less combustible than the WRBs listed in the approvals.
WRBs may not be used under and over insulation. -Where an approval does not list “None” for WRB, None may be used to comply with the point above.
Where an approval does not list air gaps for specific claddings, use the air gap tested for brick (usually 2 inches) as a maximum.
Walls containing up to 3 in. Kingspan GreenGuard® XPS Insulation
Please refer to XPS manufacturers’ recommendations for window and door header details.
Walls containing XPS insulation
| Wall Components | Materials | |
| Base Wall System Use any of these options | 1 | Concrete Wall |
| 2 | Concrete Masonry Wall | |
| 3 | 20-gauge (min) 3 5/8 in. depth (min.) steel studs spaced at a maximum of 16 in. o.c. with lateral bracing every 4 ft. vertically | |
| a | 1 layer - 5/8 in. thick Type X or 1/2 in. thick Type X gypsum wallboard on interior | |
| Floorline Firestopping | 1 | 4 lb/cu ft mineral wool (i.e., Thermafiber®) in each stud cavity at each floor line, attached with Z-clips or equivalent |
| Cavity Insulation Use any of these options | 1 | None |
| 2 | Any noncombustible insulation per ASTM E136 | |
| 3 | Fiberglass (Batt type Class A ASTM E84 faced or unfaced | |
| Exterior Sheathing Use any of these options | 1 | None |
| 2 | Minimum 1/2 in. thick, exterior type gypsum sheathing | |
| 3 | Minimum 5/8 in. thick, Type X, exterior type gypsum sheathing | |
| Air Barrier or Weather-Resistive Barrier Applied to Exterior Sheathing | 1 | PERM-A-BARRIER® Aluminum Wall Membrane |
| 2 | PERM-A-BARRIER® VPL | |
| 3 | PERM-A-BARRIER® VPS | |
| 4 | PERM-A-BARRIER® NPL | |
| 5 | PERM-A-BARRIER® Ultra | |
| Note | All WRB to be installed at the indicated or recommended application rates and per the manufacturer installation instructions | |
| Exterior Insulation | 1 | Kingspan GreenGuard® XPS - 1/2 in. minimum and 3 in. maximum |
| Note | Seal all insulation joints with maximum 4 in. wide asphalt or Butyl based flashing tape | |
| Exterior Veneer Use any of these options | 1 | Brick |
| a | Standard nominal 4 in. thick, clay brick | |
| b | Brick veneer anchors - standard types - installed maximum 24 in. o.c. vertically on each stud | |
| c | Maximum 2 in. air gap between exterior insulation and brick | |
| 2 | Concrete | |
| a | Minimum 2 in. thick | |
| b | Maximum 2 in. air gap between exterior insulation and concrete. | |
| 3 | CMU - Concrete Masonry Units | |
| a | Minimum 4 in. thick | |
| b | Maximum 2 in. air gap between exterior insulation and CMU | |
| 4 | Stone Veneer | |
| a | Minimum 2 in. thick limestone or natural stone veneer | |
| b | Minimum 1 1/2 in. thick cast artificial stone veneer | |
| c | Any standard non-open joint technique may be used (such as shiplap, etc.) | |
| 5 | Terracotta Cladding | |
| a | Minimum 1 1/4 in. thick | |
| b | Any standard joint installation technique may be used (such as shiplap, etc.) | |
| 6 | Portland cement-sand plaster (Stucco) over metal lath | |
| a | Minimum 3/4 in. thick | |
| b | 2 or 3-coat application | |
| c | No air gap between Stucco veneer and exterior insulation | |
Walls containing up to 4 in. Kingspan GreenGuard® XPS Insulation
Please refer to XPS manufacturers’ recommendations for window and door header details.
| Wall Components | Materials | |
| Base Wall System | 1 | 18-gauge 3 5/8 in. depth (min.) galvanized steel studs spaced at a maximum 24 in. o.c. |
| a | 1 layer - 5/8 in. thick gypsum wallboard on interior | |
| Cavity Insulation | 1 | Unfaced fiberglass batt insulation |
| Exterior Sheathing | 1 | One (1) layer 1/2 in. thick exterior type gypsum |
| Air Barrier or Weather-Resistive Barrier Applied to Exterior Sheathing Use any of these options | 1 | PERM-A-BARRIER® Aluminum Wall Membrane |
| 2 | PERM-A-BARRIER® VPL | |
| 3 | PERM-A-BARRIER® VPL LT | |
| 4 | PERM-A-BARRIER® VPS | |
| 5 | PERM-A-BARRIER® Ultra | |
| Exterior Insulation | 1 | Kingspan GreenGuard® XPS Insulation Board- 4 in. thickness |
| WRB Over Exterior Insulation | 1 | 10mm Keene Building Products Driwall™ Rainscreen drainage mat |
| Exterior Veneer | 1 | Glen-Gery Thin Veneer Brick |
| a | First a layer of 1/2 in. thick PermaBASE® cement board | |
| b | Laticrete MVIS™ Thin Brick Mortar applied to full surface of PermaBASE® | |
| c | Thin Veneer Brick applied with Glen-Gery Mortar Blend Portland cement-line mortar as grout | |
Walls containing Dow Styrofoam™ XPS Insulation
Please refer to XPS manufacturers’ recommendations for window and door header details.
| Wall Component | Materials | |
| Base Wall System Use either 1, 2, 3, or 4 | 1 | Concrete Wall |
| 2 | Concrete Masonry Unit (CMU) Wall | |
| 3 | Steel studs: minimum 3 5/8 in. depth, minimum 20-gauge at a maximum spacing of 24 in. OC. One layer of 5/8 in. thick Type X gypsum wallboard on interior face of studs. Gypsum wallboard joints shall receive at a minimum a LeveI 2 finish with all fasteners covered with joint compound. | |
| 4 | Wood studs: Minimum 2-inch x 4-inch FRTW wood studs spaced at a maximum of 24-inch OC. One layer of 5/8 in. thick Type X gypsum wallboard installed on interior face of wood studs. One layer of 5/8 in. thick Type X exterior gypsum sheathing installed on exterior face of wood studs. Minimum two top plates at floorlines. As an option, any thickness of plywood or OSB may be installed on exterior face of wood studs under exterior gypsum sheathing. | |
| Floorline Firestopping Required in curtain-wall construction | 4 lb/cu ft mineral wool friction fit in each stud cavity, at each floorline | |
| Stud Cavity Insulation Use either 1, 2, 3, or 4 | 1 | None |
| 2 | Fiberglass batt insulation (faced or unfaced) | |
| 3 | Mineral wool blown-in or batt insulation (faced or unfaced) | |
| 4 | Any noncombustible material | |
| Exterior Sheathing Use either 1, 2, 3, or 4 | 1 | 5/8 in. thick Type X glass mat gypsum sheathing |
| 2 | 1/2 in. thick glass mat gypsum sheathing | |
| 3 | 5/8 in. thick DensElement® sheathing - The joints of the DensElement® sheathing may be sealed with R-Guard FastFlash Liquid Flashing or approved equivalent | |
| Note | Exterior sheathing is optional for Base wall systems 1 and 2 above | |
| WRB Materials Applied to Exterior Sheathing Use either 1, 2, 3, 4, or 5 | 1 | PERM-A-BARRIER® Aluminum Wall Membrane |
| 2 | PERM-A-BARRIER® VPL | |
| 3 | PERM-A-BARRIER® VPL LT | |
| 4 | PERM-A-BARRIER® VPS | |
| 5 | PERM-A-BARRIER® Ultra | |
| Note | Any WRB shown above can be applied over Base Wall System 1 or 2 above, where able. | |
| Continuous insulation adhesive Use either 1, 2, 3, or 4 | 1 | None |
| 2 | Sto TurboStick Adhesive | |
| 3 | Sto ExtraSeal® | |
| 4 | DuPont™ Insta Stik™ quick set polyurethane adhesive | |
| Continuous insulation | DuPont™ Styrofoam™ Type IV per ASTM C578. Total thickness to be minimum 1/2 in. to maximum 3 in. XPS products include the Blue Styrofoam™, Grey Styrofoam™ (covered in ICC-ESR 2142), and Grey Styrofoam™ brand ST-100 Series (LIMS-274901) Styrofoam™ (covered in ICC-ESR 4755). | |
| Sealing of exterior insulation Use either 1 or 2 | 1 | None |
| 2 | Seal all exterior insulation joints, and as an option, veneer tie penetrations with: | |
| a | DuPont™ LiquidArmor™ - CM Flashing and Sealant-max. 50-mil wet thickness, max. 4 in. width | |
| b | DuPont™ LiquidArmor™ - LT Flashing and Sealant-max. 35-miI wet thickness, max. 4 in. width. | |
| c | Asphalt, acrylic, or butyl-based flashing tape - max. 4 in. width | |
| d | DuPont™ Great Stuff PRO™- Use on joints that are ≤ 1/4 in. width, vertical joints must be staggered & remove significant excess from the face of the XPS | |
| Secondary WRB material Use either 1, 2, or 3 | 1 | None |
| 2 | No. 15 Grade D building paper | |
| 3 | Asphalt felt in compliance with ASTM D226 | |
| Drainage Mat Use either 1 or 2 | 1 | None |
| 2 | Sto DrainScreen® - installed over Air Barrier and water-resistive barrier membrane or over continuous insulation | |
| Exterior Veneer | Stucco - Minimum 3/4 in. thick 2 - or 3-coat stucco complying with ASTM C926 applied over 2 1/2 -lb/yd^2 galvanized steel diamond mesh lath complying with ASTM C1063/C847. As an option, adhered masonry veneer, such as: Thin brick, manufactured stone, ceramic or porcelain tile may be installed over the Stucco | |
Walls containing a maximum 4.25-inch thick ThermaxTM insulation board
| Wall Component | Materials | |
| Base Wall System Use either 1, 2, 3, 4, 5, or 6 | 1 | Concrete Wall |
| 2 | Concrete Masonry Unit (CMU) Wall | |
| 3 | Standard clay brick wall | |
| 4 | Adobe block wall | |
| 5 | Wood studs: nominal 2-in. x 4-in. or greater FRTW wood studs spaced at a maximum of 24-in. OC. Wall cavity empty (no insulation) or filled with fiberglass batt insulation (faced or unfaced) or mineral wool insulation (faced or unfaced). One layer of 5/8 in. thick Type X gypsum wallboard installed on interior face of wood studs. One layer of 5/8 in. thick Type X exterior gypsum sheathing installed on exterior face of wood studs. Minimum two top plates at floorlines. As an option, any thickness of plywood or OSB may be installed on exterior face of wood studs under exterior gypsum sheathing. | |
| 6 | Steel studs: minimum 3 5/8 in. depth, minimum 20-gauge at a maximum spacing of 24 in. OC with lateral bracing every 4 ft. vertically with: | |
| a | One layer of 5/8 in. thick Type X gypsum wallboard on interior face of studs. Gypsum wallboard joints shall receive at a minimum a LeveI 2 finish with all fasteners covered with joint compound, or | |
| b | MONOKOTE® Z-3306 installed at a minimum 3/8 in. thickness over Thermax, or | |
| c | International Cellulose Corporation's Ure-K® Thermal Barrier System installed at a minimum of 1 1/4 in. thickness over Thermax | |
| Floorline Firestopping Required in curtain-wall construction | 4 lb/cu ft mineral wool (e.g., Thermafiber) in each stud cavity and at each floor line - friction fit cavity, attached with Z-clips, or equivalent | |
| Interior Vapor / Moisture barrier for use with Base Wall 5 or 6 | 1 | None |
| 2 | Any 6-mil thick polyethylene film | |
| Cavity Insulation Use either 1, 2, or 3 or combination of 2 and 3 | 1 | None - Screw end of fasteners that protrude into the stud cavity can be covered with a maximum of 1 1/2 in. diameter plug of DuPont™ Froth-Pak™ Class A rated per ASTM E84 |
| 2 | Maximum 2 in. thickness of BASF SPRAYTITE® 81206 SPF (covered in Intertek CCRR-1031) or BASF WALLTITE® LWP (covered in Intertek CCRR-0374) applied using sheathing or insulation as substrate and covering the width of the cavity and inside the stud flange. Must cover the SPRAYTITE® 81206 or WALLTITE® LWP above any window, louver or door opening with minimum 2 in. thickness of mineral wool insulation (1 1/2 in. mineral wool cover in 3 1.2 in. deep studs). The mineral wool insulation must be installed from top of opening to bottom of floor deck above. Additionally, a special construction of the header must be used. | |
| Exterior Sheathing Use either 1, 2, or 3 OR | 1 | None |
| 2 | 1/2 in. thick exterior gypsum sheathing | |
| 3 | 5/8 in. thick Type X exterior gypsum sheathing | |
| Note | Exterior sheathing is not required for Base wall systems 1 through 4 above | |
| Multi-Function Sheathing & WRB Products | 1 | USG Securock® ExoAir® 430 System |
| Note | This item replaces the exterior sheathings above. When this item is used the exterior sheathings are not required and WRBs below (Layer IV) shall not be used. | |
| WRB Materials Applied to Exterior Sheathing 2 or 3 Use either 1, 2, 3, 4, 5, 6, or 7 | 1 | PERM-A-BARRIER® Aluminum Wall Membrane |
| 2 | PERM-A-BARRIER® VPL | |
| 3 | PERM-A-BARRIER® VPL LT | |
| 4 | PERM-A-BARRIER® VPS | |
| 5 | PERM-A-BARRIER® NPL 10 | |
| 6 | PERM-A-BARRIER® VPL 50 RS | |
| 7 | PERM-A-BARRIER® Ultra | |
| Note | Any WRB material shown above can be applied over Base Wall System 1 through 4 above, where able. | |
| Drainage Mat Use either 1 or 2 | 1 | None |
| 2 | DuPont™ Tyvek® DrainVent™ Rainscreen - Limited to use as: | |
| Must be used in conjunction with any WRB shown above Exterior veneers #1 thru #6 in Layer VIII below when no air gap is present between the veneer and the DrainVentTM Exterior veneers #2 thru #15, #16b thru 16m, #17 and #19 in Layer VIII below when no air gap is present between the veneer and the DrainVentTM | ||
| Exterior Insulation Use either 1 or 2 | 1 | None (Exterior sheathing must be Item 2 or 3 listed in exterior sheathings above) |
| 2 | DuPont ThermaxTM Brand Rigid Insulation - Total thickness to be a minimum of 5/8 in. to maximum of 4 1/4 in. | |
| Exterior Insulation Joint Flashing Use either 1 or 2 | 1 | None - Only when a water-resistive barrier is applied to the exterior sheathing or when a water-resistive barrier is applied to the exterior insulation |
| 2 | Flash all exterior insulation joints and veneer tie penetrations with one of the following: | |
| a | DuPont LiquidArmorTM - CM Flashing and Sealant-max. 60-mil wet thickness, max. 5 in. width | |
| b | DuPont LiquidArmorTM - LT Flashing and Sealant-max. 35-miI wet thickness, max. 5 in. width. | |
| c | DuPont LiquidArmorTM - QS Flashing and Sealant-max. 60-mil wet thickness, max. 5 in. width | |
| d | DuPont Tyvek® Fluid Applied Flashing & Joint Compound -max. 25-mil wet thickness, max. 3 in. width | |
| e | DuPont WeatherMateTM Flashing - max. 4 in. width | |
| f | Asphalt, acrylic, or butyl-based flashing tape - max. 4 in. width | |
| g | DuPont Great Stuff Pro- Use on joints that are ≤ 1/4 in. width, vertical joints must be staggered & remove significant excess from the face of the Thermax | |
| h | DOWSIL DEFENDAIRTM 200 or DOWSIL DEFENDAIRTM 200C | |
| Note | With either e) or f), a small amount of spray primer may be used to aid in adhesion; maximum 4 in. width | |
| Exterior Veneer Use either 1, 2, 3, 4, 5, or 6 | 1 | Brick - Standard type brick veneer anchors, installed a maximum of 24-inches OC vertically on each stud. A maximum 2-inch air gap between the exterior insulation and the brick. Use standard nominal 4-inch thick clay bricks. |
| 2 | Stucco - Minimum 3/4 in. thick, exterior cement plaster and lath. A secondary water-resistive barrier can be installed between the exterior insulation and the lath. The secondary water-resistive barrier can be 1 or 2 layers of asphalt building paper but shall not be full-coverage asphalt or butyl-based self-adhered membranes. | |
| 3 | Minimum 2 in. thick limestone or natural stone veneer or minimum 1 1/2 in. thick artificial cast stone veneer. Any standard non-open-joint installation technique such as ship-lap, etc., can be used. | |
| 4 | Terracotta cladding - minimum 1 1/4 in. thick terracotta cladding system. Any non-open-joint installation technique such as ship-lap, etc. can be used. | |
| 5 | Concrete or precast concrete panels - Minimum 1 1/2 in. thick panel, with a 2-in. maximum air gap between exterior insulation and concrete panel. Any standard non-open-joint installation technique such as ship-lap, etc. can be used. | |
| 6 | Concrete Masonry Units - Minimum 2 in. thick panel, with a 2 in. maximum air gap between exterior insulation and the interior face of the exterior CMU. Any standard non-open-joint installation technique can be used | |
| Flashing of Window, Door, and Other Exterior Wall Penetrations | As an option, flash window, door and other exterior penetrations with either. | |
| a | DuPont LiquidArmorTM - CM Flashing and Sealant - max. 60-mil wet thickness, max. 12 in. width. | |
| b | DuPont LiquidArmorTM - LT Flashing and Sealant - max. 35-mil wet thickness, max. 12 in. width. | |
| c | DuPont LiquidArmorTM - QS Flashing and Sealant-max. 60-mil wet thickness, max. 12 in. width | |
| d | DuPont Tyvek® Fluid Applied Flashing & Joint Compound -max. 25-mil wet thickness, max. 3 in. width | |
| e | DuPont DuraGardTM CM Transition Flashing - max. 12 in. width | |
| f | Limited amounts of acrylic, asphalt or butyl-based flashing tape - max. 12 in. width. | |
| g | Hohmann & Barnard TextroflashTM Flashing | |
| h | DOWSIL DEFENDAIRTM 200 or DOWSIL DEFENDAIRTM 200C | |
| Note | Flashing tape used in wall openings may extend the wall width plus extend up to a maximum of 4 in. onto the exterior face of the sheathing. Flashing tape may be used on sheathing exterior corners where the flashing tape may extend a maximum of 4 in. onto the sheathing face on either side of the corner | |
| Mortar Net | As an option, non-full wall coverage mortar drop and drainage nets and meshes can be installed at base of wall and at shelf angles to permit water drainage. Maximum 12 in. high | |
Walls containing a maximum 3-inch thick ThermaxTM insulation board
| Wall Component | Materials | |
| Base Wall System Use either 1, 2, 3, 4, 5, or 6 | 1 | Concrete Wall |
| 2 | Concrete Masonry Unit (CMU) Wall | |
| 3 | Standard clay brick wall | |
| 4 | Adobe block wall | |
| 5 | Wood studs: nominal 2-in. x 4-in. or greater FRTW wood studs spaced at a maximum of 24-in. OC. Wall cavity empty (no insulation) or filled with fiberglass batt insulation (faced or unfaced) or mineral wool insulation (faced or unfaced). One layer of 5/8 in. thick Type X gypsum wallboard installed on interior face of wood studs. One layer of 5/8 in. thick Type X exterior gypsum sheathing installed on exterior face of wood studs. Minimum two top plates at floorlines. As an option, any thickness of plywood or OSB may be installed on exterior face of wood studs under exterior gypsum sheathing. | |
| 6 | Steel studs: minimum 3 5/8 in. depth, minimum 20-gauge at a maximum spacing of 24 in. OC with lateral bracing every 4 ft. vertically with: | |
| a | One layer of 5/8 in. thick Type X gypsum wallboard on interior face of studs. Gypsum wallboard joints shall receive at a minimum a LeveI 2 finish with all fasteners covered with joint compound, or | |
| b | MONOKOTE® Z-3306 installed at a minimum 3/8 in. thickness over Thermax, or | |
| c | International Cellulose Corporation's Ure-K® Thermal Barrier System installed at a minimum of 1 1/4 in. thickness over Thermax | |
| Floorline Firestopping Required in curtain-wall construction | 4 lb/cu ft mineral wool (e.g., Thermafiber) in each stud cavity and at each floor line - friction fit cavity, attached with Z-clips, or equivalent | |
| Interior Vapor / Moisture barrier for use with Base Wall 5 or 6 | 1 | None |
| 2 | Any 6-mil thick polyethylene film | |
| Cavity Insulation Use either 1, 2, or 3 or combination of 2 and 3 | 1 | None - Screw end of fasteners that protrude into the stud cavity can be covered with a maximum of 1 1/2 in. diameter plug of DuPont™ Froth-Pak™ Class A rated per ASTM E84 |
| 2 | Maximum 2 in. thickness of BASF SPRAYTITE® 81206 SPF (covered in Intertek CCRR-1031) or BASF WALLTITE® LWP (covered in Intertek CCRR-0374) applied using sheathing or insulation as substrate and covering the width of the cavity and inside the stud flange. Must cover the SPRAYTITE® 81206 or WALLTITE® LWP above any window, louver or door opening with minimum 2 in. thickness of mineral wool insulation (1 1/2 in. mineral wool cover in 3 1.2 in. deep studs). The mineral wool insulation must be installed from top of opening to bottom of floor deck above. Additionally, a special construction of the header must be used. | |
| 3 | Fiberglass blown-in or batt insulation (faced or unfaced) or mineral wool blown-in or batt insulation (faced or unfaced) | |
| Exterior Sheathing Use either 1, 2, or 3 OR | 1 | None |
| 2 | 1/2 in. thick exterior gypsum sheathing | |
| 3 | 5/8 in. thick Type X exterior gypsum sheathing | |
| Note | Exterior sheathing is not required for Base wall systems 1 through 4 above | |
| Multi-Function Sheathing & WRB Products | 1 | USG Securock® ExoAir® 430 System |
| Note | This item replaces the exterior sheathings above. When this item is used the exterior sheathings are not required and WRBs below (Layer IV) shall not be used. | |
| WRB Materials Applied to Exterior Sheathing 2 or 3 Use either 1, 2, 3, 4, 5, 6, or 7 | 1 | PERM-A-BARRIER® Aluminum Wall Membrane |
| 2 | PERM-A-BARRIER® VPL | |
| 3 | PERM-A-BARRIER® VPL LT | |
| 4 | PERM-A-BARRIER® VPS | |
| 5 | PERM-A-BARRIER® NPL 10 | |
| 6 | PERM-A-BARRIER® VPL 50 RS | |
| 7 | PERM-A-BARRIER® Ultra | |
| Note | Any WRB material shown above can be applied over Base Wall System 1 through 4 above, where able. | |
| Drainage Mat Use either 1 or 2 | 1 | None |
| 2 | DuPont™ Tyvek® DrainVent™ Rainscreen - Limited to use as: | |
| Must be used in conjunction with any WRB shown above Exterior veneers #1 thru #6 in Layer VIII below when no air gap is present between the veneer and the DrainVentTM Exterior veneers #2 thru #15, #16b thru 16m, #17 and #19 in Layer VIII below when no air gap is present between the veneer and the DrainVentTM | ||
| Exterior Insulation Use either 1 or 2 | 1 | None (Exterior sheathing must be Item 2 or 3 listed in exterior sheathings above) |
| 2 | DuPont™ ThermaxTM Brand Rigid Insulation - Total thickness to be a minimum of 5/8 in. to maximum of 3 in. | |
| Exterior Insulation Joint Flashing Use either 1 or 2 | 1 | None - Only when a water-resistive barrier is applied to the exterior sheathing or when a water-resistive barrier is applied to the exterior insulation |
| 2 | Flash all exterior insulation joints and veneer tie penetrations with one of the following: | |
| a | DuPont™ LiquidArmor™ - CM Flashing and Sealant-max. 60-mil wet thickness, max. 5 in. width | |
| b | DuPont™ LiquidArmor™ - LT Flashing and Sealant-max. 35-miI wet thickness, max. 5 in. width. | |
| c | DuPont™ LiquidArmor™ - QS Flashing and Sealant-max. 60-mil wet thickness, max. 5 in. width | |
| d | DuPont™ Tyvek® Fluid Applied Flashing & Joint Compound -max. 25-mil wet thickness, max. 3 in. width | |
| e | DuPont™ WeatherMateTM Flashing - max. 4 in. width | |
| f | Asphalt, acrylic, or butyl-based flashing tape - max. 4 in. width | |
| g | DuPont™ Great Stuff PRO™- Use on joints that are ≤ 1/4 in. width, vertical joints must be staggered & remove significant excess from the face of the Thermax | |
| h | DOWSIL DEFENDAIR™ 200 or DOWSIL DEFENDAIR™ 200C | |
| Note | With either e) or f), a small amount of spray primer may be used to aid in adhesion; maximum 4 in. width | |
| Exterior Veneer Use either 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 or 19 | 1 | ACM System - Use any Aluminum Composite Material (ACM) system that has been successfully tested by the panel manufacturer via the NFPA 285 test method. Acceptable NFPA 285 testing shall consist of successful NFPA test results on a wall assembly incorporating a comparable thickness of combustible foam insulation (e.g., polyiso) behind the ACM. These ACM panel systems include: |
| - | Reynobond® FR ACM | |
| - | ALPOLIC® fr ACM | |
| - | ALUCOBOND® PLUS ACM | |
| 2 | Terracotta cladding - use any terracotta cladding system in which terracotta is minimum 1 1/4 in. thick. Any standard installation can be used. | |
| 3 | Metal exterior wall coverings such as steel, aluminum, copper, zinc, etc. Any standard installation technique can be used | |
| 4 | Fiber-cement siding (noncombustible) - minimum 1/4 in. thick. Any standard installation technique with noncombustible furring can be used. A maximum 1 1/2 in. air gap allowed behind the fiber-cement siding. | |
| 5 | Brick - Standard nominal 4 in. thick, clay brick with standard type brick veneer anchors, installed maximum 24 in. OC vertically on each stud. Air gap between exterior insulation and brick to be a maximum of 2 in. | |
| 6 | Stucco - Minimum 3/4 in. thick, exterior cement plaster and lath. A secondary water-resistive barrier can be installed between the exterior insulation and the lath. The secondary water-resistive barrier can be 1 or 2 layers of asphalt building paper but shall not be full-coverage asphalt or butyl-based self-adhered membranes. | |
| 7 | Corium Thin brick system | |
| 8 | Minimum 1 1/4 in. thick limestone or natural stone veneer or minimum 1 1/4 in. thick artificial cast stone veneer. Any standard installation technique such as ship-lap, etc., can be used. | |
| 9 | StoneLite® natural stone wall panels by Stone Panels, Inc. | |
| 10 | Glen-Gery Thin Tech® Elite Series- Masonry veneer | |
| 11 | Concrete or precast concrete panels - Minimum 1 1/2 in. thick panel. Air gap between exterior insulation and concrete panel shall be as per wall design. Any standard installation technique can be used. | |
| 12 | Ceramic tile (min. 3/8 in. thick) bonded using noncombustible mortar adhesive to minimum 1/2 in. thick cement board or gypsum sheathing | |
| 13 | Thin brick (min. 3/4 in. thick clay brick) fully adhered with cementitious mortar (standard or polymer modified} to min. 1/2 in. thick cement backer board or gypsum sheathing. A secondary water-resistive barrier can be installed between the board/sheathing and the brick. The secondary water-resistive barrier shall not be full-coverage asphalt or butyl-based self-adhered membranes. | |
| 14 | Natural stone or artificial stone (min. 3/4 in. thick clay brick) fully adhered with cementitious mortar (standard or polymer modified) to min. 1/2 in. thick cement backer board or gypsum sheathing. A secondary water-resistive barrier can be installed between the board/sheathing and the stone. The secondary water-resistive barrier shall not be full-coverage asphalt or butyl-based self-adhered membranes | |
| 15 | Concrete Masonry Units - Minimum 2 in. thick panel, with a 2 in. maximum air gap between exterior insulation and the interior face of the exterior CMU. Any standard non-open-joint installation technique can be used | |
| 16 | Knight Wall Systems to include: | |
| a | ACM System - Use any ACM system that has been successfully tested by the panel manufacturer via the NFPA 285 test method. Any standard installation technique can be used. These ACM panel systems include: | |
| - | Reynobond® FR ACM | |
| - | ALPOLIC® fr ACM | |
| - | ALUCOBOND® PLUS ACM | |
| b | Terracotta cladding - use any terracotta cladding system in which terracotta is minimum 1 1/4 in. thick. Any standard installation can be used. | |
| c | Metal exterior wall coverings such as steel, aluminum, copper, zinc, etc. Any standard installation technique can be used | |
| d | Brick - Standard nominal 4 in. thick, clay brick with standard type brick veneer anchors, installed maximum 2 in. OC vertically on each stud. Air gap between exterior insulation and brick to be as per wall design. | |
| e | Stucco - Minimum 3/4 in. thick, exterior cement plaster and lath attached to minimum 1/2 in. thick backer board. A secondary water-resistive barrier can be installed between the exterior insulation and the lath. The secondary water-resistive barrier can be 1 or 2 layers of asphalt building paper but shall not be full-coverage asphalt or butyl-based self-adhered membranes. | |
| f | Corium Thin brick system | |
| g | Minimum 1 1/4 in. thick limestone or natural stone veneer or minimum 1 1/4 in. thick artificial cast stone veneer. Any standard installation technique such as ship-lap, etc., can be used. | |
| h | StoneLite® natural stone wall panels by Stone Panels, Inc. | |
| i | Glen-Gery Thin Tech® Elite Series- Masonry veneer | |
| j | Concrete or precast concrete panels - Minimum 1 1/2 in. thick panel. Air gap between exterior insulation and concrete panel shall be as per wall design. Any standard installation technique can be used. | |
| k | Ceramic tile (min. 3/8 in. thick) bonded using noncombustible mortar adhesive to minimum 1/2 in. thick cement board or gypsum sheathing | |
| l | Thin brick (min. 3/4 in. thick clay brick) fully adhered with cementitious mortar (standard or polymer modified} to min. 1/2 in. thick cement backer board or gypsum sheathing. A secondary water-resistive barrier can be installed between the board/sheathing and the brick. The secondary water-resistive barrier shall not be full-coverage asphalt or butyl-based self-adhered membranes. | |
| m | Natural stone or artificial stone (min. 3/4 in. thick clay brick) fully adhered with cementitious mortar (standard or polymer modified) to min. 1/2 in. thick cement backer board or gypsum sheathing. A secondary water-resistive barrier can be installed between the board/sheathing and the stone. The secondary water-resistive barrier shall not be full-coverage asphalt or butyl-based self-adhered membranes | |
| 17 | Cornerstone Building Products to include: | |
| - | PBR Panel (Exposed fasteners) | |
| - | PBU Panel (Exposed fasteners) | |
| - | AVP Panel (Exposed fasteners) | |
| - | Designer Series Panels (Exposed fasteners) | |
| - | ShadowRib™ Panels (Exposed fasteners) | |
| - | NuWall® Panels (Exposed fasteners) | |
| - | MasterLine 16® (Concealed fasteners) | |
| 18 | FUNDERMAX Gmbh "M Look" panels - 7-mm thick, installed with 1 to 1 1/2 in. air gap behind the panels and using exposed fasteners. | |
| 19 | TABS II Plus Wall System w/o TABS II Plus "RainScreen" with Pre-attached wrap. | |
| Flashing of Window, Door, and Other Exterior Wall Penetrations | As an option, flash window, door and other exterior penetrations with either. | |
| a | DuPont™ LiquidArmor™ - CM Flashing and Sealant - max. 60-mil wet thickness, max. 12 in. width. | |
| b | DuPont™ LiquidArmor™ - LT Flashing and Sealant - max. 35-mil wet thickness, max. 12 in. width. | |
| c | DuPont™ LiquidArmor™ - QS Flashing and Sealant-max. 60-mil wet thickness, max. 12 in. width | |
| d | DuPont™ Tyvek® Fluid Applied Flashing & Joint Compound -max. 25-mil wet thickness, max. 3 in. width | |
| e | Limited amounts of acrylic, asphalt or butyl-based flashing tape - max. 12 in. width. | |
| f | Hohmann & Barnard Textroflash™ Flashing | |
| g | DOWSIL DEFENDAIR™ 200 or DOWSIL DEFENDAIR™ 200C | |
| h | DuPont™ DuraGard™ CM Transition Flashing - max. 12 in. width | |
| Note | Flashing tape used in wall openings may extend the wall width plus extend up to a maximum of 4 in. onto the exterior face of the sheathing. Flashing tape may be used on sheathing exterior corners where the flashing tape may extend a maximum of 4 in. onto the sheathing face on either side of the corner | |
| Mortar Net | As an option, non-full wall coverage mortar drop and drainage nets and meshes can be installed at base of wall and at shelf angles to permit water drainage. Maximum 12 in. high | |
For Firestone (now Amrize) Enverge™ CI foil exterior wall insulation or Enverge™ CI glass exterior wall insulation wall component
| Wall Component | Materials | |
| Base Wall System Use either 1, 2, or 3 | 1 | Concrete Wall |
| 2 | Concrete Masonry Wall | |
| 3 | 1 layer - 5/8 in. thick Type X gypsum wallboard on interior, installed over steel studs: minimum 3 5/8 in. depth, minimum 20-gauge at a maximum of 24 in. OC with lateral bracing every 4 ft. vertically | |
| Floorline Firestopping | 4 lb/cu ft mineral wool (e.g., Thermafiber®) in each stud cavity and at each floor line - attached with Z-clips or equivalent | |
| Cavity Insulation Use either 1, 2, or 3 | 1 | None |
| 2 | Any noncombustible insulation | |
| 3 | Fiberglass batt insulation (faced or unfaced) | |
| Exterior Sheathing Use either 1, 2, or 3 | 1 | None |
| 2 | 1/2 in. thick, exterior type gypsum sheathing | |
| 3 | 5/8 in. thick, exterior type gypsum sheathing | |
| Water-Resistive Barrier Applied to Exterior Sheathing 2 or 3 above Use either 1, 2, 3, 4, 5, or 6 | 1 | PERM-A-BARRIER® Aluminum Wall Membrane |
| 2 | PERM-A-BARRIER® VPL | |
| 3 | PERM-A-BARRIER® VPL LT | |
| 4 | PERM-A-BARRIER® VPS | |
| 5 | PERM-A-BARRIER® NPL | |
| 6 | PERM-A-BARRIER® Ultra | |
| Exterior Insulation Use either 1 or 2 | 1 | Firestone Enverge™ CI Foil Exterior Wall Insulation - 2 1/2 in. maximum thickness with Exterior Veneer - Part 1 or 4 in. maximum thickness with Exterior Veneer - Part 2 |
| 2 | Firestone Enverge™ CI Glass Exterior Wall Insulation - 2 1/2 in. maximum thickness with Exterior Veneer - Part 1 or 4 in. maximum thickness with Exterior Veneer - Part 2 | |
| Flashing Use either None, 1, or 2 | Optional - Flash all exterior insulation joints and veneer tie penetrations with | |
| 1 | 4 in. wide Shuretape® AF 100 or AF 975CT aluminum foil tape | |
| 2 | Asphalt or butyl-based flashing tape-Maximum 4 in. wide (AAMA71 or ICC-ES AC 148 complying) | |
| Note | Optional - Spray primer to aid in adhesion of either 1 or 2 applied at a maximum of 5 inches wide | |
| Weather-resistive barrier applied to exterior insulation | None | |
| Exterior Veneer Part 1 Use either 1, 2, 3, 4, 5, 6, 7, or 8 | 1 | Brick |
| - | Brick veneer anchors - standard types - installed maximum 24 in. OC vertically on each stud | |
| - | Maximum 2 in. air gap between exterior insulation and brick | |
| - | Standard nominal 4 in. thick clay brick | |
| 2 | Stucco - Minimum 3/4 in. thick exterior cement plaster and lath. A secondary water-resistive barrier can be installed between the exterior insulation and the lath. The secondary water-resistive barrier shall not be full-coverage asphalt or butyl-based self-adhered membranes. | |
| 3 | Minimum 2 in. thick limestone or natural stone veneer or minimum 1 1/2 in. thick artificial cast stone veneer. Any standard installation technique can be used. | |
| 4 | Terracotta cladding - Use any terracotta cladding system in which terracotta is minimum 1 1/4 in. thick. Any standard installation technique can be used | |
| 5 | Metal veneer such as steel, aluminum, copper, etc. Any standard installation technique can be used. | |
| 6 | Cement board siding - Any standard installation technique can be used. | |
| 7 | MCM System - Use any Metal Composite Panel that has been successfully tested by the panel manufacturer via NFPA 285 test method. Installation shall be such that the free air cavity behind the MCM shall not exceed 2 7/8 in. | |
| 8 | Aluminum faced, aluminum honeycomb core panels. Any standard installation technique can be used. | |
| Exterior Veneer Part 2 Use either 1, 2, 3, or 4 | 1 | Brick |
| - | Brick veneer anchors - standard types - installed maximum 24 in. OC vertically on each stud | |
| - | Maximum 2 in. air gap between exterior insulation and brick | |
| - | Standard nominal 4 in. thick clay brick | |
| 2 | Stucco - Minimum 3/4 in. thick exterior cement plaster and lath. A secondary water-resistive barrier can be installed between the exterior insulation and the lath. The secondary water-resistive barrier shall not be full-coverage asphalt or butyl-based self-adhered membranes. | |
| 3 | Minimum 2 in. thick limestone or natural stone veneer or minimum 1 1/2 in. thick artificial cast stone veneer. Any standard non-open joint installation technique such as ship-lap, etc. can be used. | |
| 4 | Terracotta cladding - Use any terracotta cladding system in which terracotta is minimum 1 1/4 in. thick. Any standard non-open joint installation technique such as ship-lap, etc. can be used. | |
Note: all barriers to be installed at indicated or recommended application rates and per manufacturer's installation instructions.
For walls containing Atlas EnergyShield® Pro, CGF Pro, Ply Pro or XR exterior insulation
| Wall Component | Materials | |
| Base Wall System Use any of these items No Sheathing is needed for 1 and 2 | 1 | Cast concrete walls (1 in. minimum) |
| 2 | CMU Concrete Walls (1 in. minimum) | |
| 3 | 20-gauge (minimum) 3 5/8 in. (minimum) steel studs with 5/8 in. thick Type X gypsum wallboard on interior | |
| 4 | Fire-Retardant Treated (FRT) wood studs spaced 24 in. o.c. (maximum) with 5/8 in. thick Type X gypsum wallboard on interior | |
| Floorline Firestopping Use any of these items | 1 | None - only with exterior sheathing option 1, 3, 4, or 5 (gypsum wallboard, concrete, DensElement® or Securock® ExoAir® 430) |
| 2 | 4 in. thick, 4-pcf mineral fiber (wool) safing insulation installed with Z-clips or equivalent | |
| 3 | 1 1/2 in. FRT lumber for use with FRT studs | |
| Cavity Insulation Use any of these items Note: SPF cavity insulations 5-22 must use fire stopping at floor lines and exterior gypsum sheathing (thickness as noted) | 1 | None |
| 2 | Any noncombustible insulation per ASTM E136 | |
| 3 | Any mineral fiber (Board Type Class A ASTM E84 faced or unfaced) | |
| 4 | Any fiberglass (Batt Type Class A ASTM E84 faced or unfaced) | |
| 5 | 5 1/2 in. (maximum) Icynene LD-C-50™ spray foam in 6 in. deep studs (maximum) full fill without an air gap. Use with 5/8 in." exterior sheathing | |
| 6 | 5 1/2 in. (maximum) Icynene MD-C-200™ 2 pcf spray foam in 6 in. deep studs (maximum) full fill without an air gap. Use with 5/8 in. exterior sheathing. | |
| 7 | 5 1/2 in. (maximum) Icynene MD-R-210™ 2 pcf spray foam in 6 in. deep studs (maximum) full fill without an air gap. Use with 5/8 in. exterior sheathing. | |
| 8 | 6 in. (maximum) SWD Urethane QUIK-SHIELD® (QS) 112, 2-pcf spray foam in 6" deep studs (maximum) or partial fill with a maximum 2 1/2 in. air gap. Use with 5/8 in. exterior sheathing. | |
| 9 | 3 1/2 in. (maximum) Gaco Western 183M spray foam in 3 5/8 in. deep studs (maximum). Use with 5/8 in. exterior gypsum sheathing | |
| 10 | 3 1/2 in. (maximum) Gaco Western F1850 with 5/8 in. exterior sheathing in 3 5/8 in. deep studs (maximum) | |
| 11 | 3 5/8 in. (maximum) Demilec Sealection® 500 with 5/8 in. exterior sheathing in 3 5/8 in. deep studs (maximum). | |
| 12 | 3 5/8 in. (maximum) Demilec HeatLok Soy® 200 Plus with 5/8 in. exterior sheathing in 3 5/8 in. deep studs (maximum) | |
| 13 | 3 in. (maximum) Bayer Bayseal® with 5/8 in. exterior sheathing | |
| 14 | 3 in. (maximum) Lapolla Foam-Lok™ FL 2000 with 5/8 in. exterior sheathing in 3 5/8 in. deep studs (maximum) | |
| 15 | 3 5/8 in. (maximum) BASF SPRAYTITE® 81206 or WALLTITE® (US and US-N) with 5/8 in. exterior sheathing in 3 5/8 in. deep studs (maximum) | |
| 16 | 3 5/8 in. (maximum) Accella (Premium Spray Products) FoamsulateTM 220 with 5/8 in. exterior sheathing in 3 5/8 in. deep studs (maximum) | |
| 17 | 3 5/8 in. (maximum) JM Corbond® III or IV - Full stud Cavity depth or less for use with 5/8 in. exterior gypsum sheathing | |
| 18 | BASF WALLTITE® (LWP, Max, XL, Plus) - 3 5/8 in. (maximum). Use with 1/2 in. exterior gypsum sheathing | |
| 19 | Carlisle SealTite™ PRO HFO, SealTite™ PRO Closed Cell, SealTite™ Pro One Zero, SealTite™ Pro Open Cell, SealTite™ Pro High Yield, SealTite™ Pro No Mix, SealTite™ Pro No Trim 21, SealTite™ Pro OCX- 3 5/8 in. (maximum). Use with 1/2 in. exterior gypsum sheathing | |
| 20 | Huntsman HeatLok HFO or HFO Pro - 3 5/8 in. (maximum). Use with 5/8 in. exterior gypsum sheathing | |
| 21 | Holcim Enverge™ EasySeal® 5, Enverge™ SucraSeal - 3 5/8 in. (maximum). Use with 1/2 in. exterior gypsum sheathing | |
| 22 | SWD Urethane (Quick-Shield Goblin or Yeti - 1 in. to 3 5/8 in. thick for use in 3 5/8 in. studs (maximum). Use with 5/8 in. exterior gypsum sheathing) | |
| Exterior Sheathing Use any of these items Note: When Items 4 or 5 (integrated sheathing WRB) are used, WRB listed below may not be added on top of the sheathing. Sheathings 1-7 are only used for stud base walls No sheathing is needed for Base Walls 1 or 2 | 1 | 1/2 in. or thicker exterior type gypsum sheathing |
| 2 | None - only when cavity SPF insulation is not used and a special opening perimeter is used (see the last entry in this table). | |
| 3 | 2 in. thick precast concrete panels attached to structural elements of building | |
| 4 | 1/2 in. or thicker GP DensElement® sheathing with integrated WRB | |
| 5 | 1/2 in. or 5/8 in. thick USG Securock® ExoAir® 430 | |
| 6 | 7/16 in. (minimum) FRT plywood panels complying with IBC Section 2303.2 and installed following code allowances for Types I, II, III, or IV construction | |
| 7 | NexGen MAXTERRA® MgO 12 mm, 16 mm, or 20 mm | |
| Note | When SPF is used in the cavity, exterior sheathing must be used. See specific sheathing thicknesses above | |
| WRB Over Base Wall Use any of these items | 1 | PERM-A-BARRIER® VPL LT |
| 2 | PERM-A-BARRIER® NPL 10 | |
| 3 | PERM-A-BARRIER® NPL | |
| 4 | PERM-A-BARRIER® NPS | |
| 5 | PERM-A-BARRIER® VPS | |
| 6 | PERM-A-BARRIER® VPL | |
| 7 | PERM-A-BARRIER® Aluminum Wall Membrane (AWM) | |
| 8 | PERM-A-BARRIER® VPL 50RS | |
| 9 | PERM-A-BARRIER® VPS 30 | |
| 10 | PERM-A-BARRIER® VPL 50 | |
| 11 | PERM-A-BARRIER® Ultra | |
| Z Girts Use any of these items for claddings requiring girts | 1 | Metallic Z Girts |
| 2 | Horizontal Smart Ci-GreenGirt | |
| 3 | Horizontal Armatherm™ FRR Z Girt | |
| 4 | Knight Wall ThermaZee® | |
| 5 | Strongirt® (Horizontal only) - Claddings must be 8 mm minimum thickness, and not for use with Claddings 7, 8, 10, or 12 | |
| 6 | SFS NH3 (horizontal only) | |
| 7 | Cascadia Clip (horizontal only) | |
| Note | Girt spacing should be to comply with wind load per manufacturer instructions. | |
| Exterior Insulation Use any of these items Items 1, 2, 3, and 4 may be multiple layers of thinner product with faces on each side | 1 | 4 in. (maximum) Atlas EnergyShield Pro |
| 2 | 4 in. (maximum) EnergyShield CGF Pro | |
| 3 | 4 3/4 in. (maximum) EnergyShield Ply Pro (4 in. EnergyShield CGF Pro with 5/8 in. or 1/4 in. FRT Plywood) | |
| 4 | 4 in. (maximum) Atlas EnergyShield XR | |
| Note 1 | 1/2 in. (minimum) exterior gypsum sheathing may be attached to exterior side of any item listed above. 5/8 in. (min) FRT plywood may be attached to exterior side of Item 1, 2, or 4 listed above | |
| Note 2 | GP DensGlass® and GP DensElement® (both minimum 1/2 in.) may be installed exterior to items 1, 2, or 4 as listed above | |
| Note 3 | MgO Board may be installed over the polyiso foam boards. NexGen Max Terra 12mm, 16mm, or 20mm mechanically attached or adhered with construction adhesive 2 in. dabs spaced 18 in. apart or 1 ft. long, 1/4 in. wide ribbons spaced 1 ft. apart. | |
| Note 4 | The listed sheathing products installed over Items 1, 2, or 4 may only be covered with the WRB products listed to be used over insulation (see WRB list below this section), but are now used over the sheathing covering the insulation unless other are justified via Fire Engineering Evaluation. DensElement® already has a WRB. No WRB goes over this product except the sheathing joint flashing listed in ICC ESR 3786. | |
| Note 5 | Mineral Wool (unfaced) that meets ASTM E136 as noncombustible may be used over Items 1, 2, 3, or 4. When the mineral wool thickness is 2 in. or greater and density is 4-pcf (minimum), the air gap from the mineral wool surface to the back of the listed claddings is unlimited, except Cladding #7 and #12 are restricted to a 2.25 in. air gap. When the mineral wool is less than 2" thick or 4-pcf density, the air gap form the mineral wool surface to the back of the cladding is restricted to that listed for each Exterior Cladding below. | |
| Note 6 | See the Special Cladding section of this Table when insulation items 1, 2, or 4, as listed above, are covered with 5/8 in. gypsum sheathing and exterior claddings as listed below are not being used | |
| WRB Over Exterior Insulation Use any of these items | 1 | PERM-A-BARRIER® Aluminum Wall Membrane (AWM) |
| 2 | PERM-A-BARRIER® VPL | |
| 3 | PERM-A-BARRIER® VPS | |
| 4 | PERM-A-BARRIER® NPS | |
| 5 | PERM-A-BARRIER® NPL | |
| 6 | PERM-A-BARRIER® VPL LT | |
| 7 | PERM-A-BARRIER® Ultra | |
| Exterior Cladding Use any of these items Note: Important: Maximum air gap 2 1/4 in. (distance from cladding inner face to insulation) Note: Cladding 8 (zinc) may only be used with EnergyShield Pro, EnergyShield XR, or EnergyShield Ply Pro. Note: Diamond Furr TT-4 (manufactured by Brand X Metals) may be used to install 3-coat stucco item 2 in the cladding list. Cladding may be attached with Knight Wall Systems ThermaZee® or other metallic Z girt | 1 | Brick – Nominal 4 in. clay brick or CMU veneer (hollow or solid) with maximum 2 1/4 in. air gap behind the brick or CMU. Brick ties/anchors 24 in. o.c. (maximum) |
| 2 | Stucco – Minimum 3/4 in. thick exterior cement plaster and lath. An optional secondary WRB (WRB allowed OVER foam over first WRB) can be installed between the insulation and lath. The optional second WRB may be any mechanically attached sheet product, asphalt, or butyl-based building paper (stapled or other mechanical attachment) with no adhesive. The second WRB may not be self-adhering full coverage asphalt or self-adhering full coverage butyl-based membranes. See note for Diamond Furr TT-4 installation. For example, the secondary WRB may be paper backing attached to lath meeting Federal Specification UUB790A: Type 1, Grade D, Style 2, or Fortifiber / Henry Jumbo Tex 60 Minute | |
| 3 | Limestone – Minimum 2 in. thick | |
| 4 | Natural stone veneer – Minimum 2 in. thick | |
| 5 | Cast artificial stone – Minimum 1 1/2 in. thick complying with ICC-ES AC 51 | |
| 6 | Terracotta cladding – Minimum 1 1/4 in. thick | |
| 7 | Any ACM or MCM that has passed NFPA 285 | |
| 8 | Uninsulated sheet metal building panels including aluminum, steel, copper, or zinc (see Note) | |
| 9 | Uninsulated fiber-cement cladding or siding minimum 1/4 in. thick. Must be 8 mm when Strongirt® is used | |
| 10 | Stone/aluminum honeycomb composite building panels that have successfully passed NFPA 285 criteria | |
| 11 | Autoclaved-aerated-concrete (AAC) panels (minimum 1 1/2 in. thick) | |
| 12 | Reynobond® ZCM zinc metal composite panel | |
| 13 | Terreal Zephir® Evolution Rainscreen System (terra cotta), minimum 9/16 in. thick | |
| 14 | User note - reserved for FunderMax m.look cladding with maximum 1 1/2 in. airspace, cladding manufacturer no longer supports use of this cladding in U.S. exterior walls | |
| 15 | CERACLAD using the manufacturer standard installation technique, air gap not to exceed 15mm | |
| 16 | CUPACLAD Slate: 101 Logic, 101 Random, 101 Parallel, 210 Vanguard. Must be 8mm minimum when Strongirt® is used | |
| 17 | Glen-Gery Thin Tech® Masonry Veneer (only with optional noncombustible mortar) | |
| 18 | Glen-Gery Tru-Brix (only with optional noncombustible mortar) | |
| 19 | Telling Corium Thin Brick System (only with steel or aluminum brick tray and optional noncombustible mortar) | |
| 20 | Thin brick or stone (minimum 3/4 in. thick clay brick) fully adhered with cementitious mortar (standard or polymer-modified) to the base wall. A secondary WRB can be installed between the exterior sheathing and the brick. The secondary WRB shall not be full-coverage asphalt or butyl-based self-adhered membranes. See cladding #2 for examples | |
| 21 | Telluride Stone (minimum 1 in.) applied to the base wall (with Atlas approved WRB or WRB in Cladding #20) using plaster/lath | |
| 22 | 5/8 in. Nichiha Architectural Wall Panels (AWP 3030), Nichiha Cladding 5/16 in. per Intertek CCRR 0258. Nichiha Cladding must be 8mm minimum when Strongirt® is used | |
| 23 | Ceramic or Porcelain Tile. Must be 8mm minimum when Strongirt® is used | |
| a | 1/4 in. minimum generic Ceramic or Porcelain tile - mechanically attached | |
| b | Ceramic or Porcelain tile- 3/8 in. thick (minimum) bonded using noncombustible mortar adhesive to a 1/2 in. thick (minimum) cement board or gypsum sheathing | |
| c | 12 mm Porcelanosa XTone per ESR 4555 | |
| 24 | Any one coat stucco (3/8 in. to 1/2 in. min) that meets any of the following: | |
| a | AC11 acceptance criteria for one coat stucco; or | |
| b | is approved for use in Type I-IV construction; or | |
| c | has been tested per NFPA285; or | |
| d | stays in place when tested per ASTM E119 (stucco exposed to fire) for at least 30 minutes | |
| 25 | Any noncombustible cement board adhered to the exterior side or mechanically attached to framing through EnergyShield Pro, EnergyShield XR or EnergyShield CGF Pro. The cement board is covered with NFPA 285 approved EIFS lamina (mesh, base coat, and finish coat) WITHOUT the EIFS Expanded Polystyrene (EPS) board. Adhered cement board may be installed over the polyiso with construction adhesive of 2 in. D dabs spaced 18 in. apart or, 1 ft. long 1/4 in. wide ribbons spaced 1 ft. apart. EIFS Approval Examples: MasterWall (IAPMO ER0433), Dryvit (ESR 1543), STO (ESR 2536), and other accredited 3rd party EIFS approvals. | |
| 26 | 8 mm (min) or 5/16 in. (min) SwissPearl® Fiber Cement Cladding | |
| 27 | Thin Brick with SpeedyMason Brick Lath and Brick Lath Rainscreen - minimum 9/16 in. thick | |
| a | May be used without exterior stud sheathing | |
| b | All screws must penetrate through to studs, with the exception of EnergyShield Ply Pro, where the system can attach directly to the FRT plywood | |
| c | Must use Spec Mix Adhered Veneer Thin Veneer Adhesion Mortar XP500 or cementitious mortar (standard or polymer modified) | |
| d | Must use header as test | |
| Special Claddings Use the base walls listed above. When gypsum sheathing is not used on stud exterior, do not use spray foam in stud cavity. ONLY use WRBs over 5/8 in. gypsum that are explicitly approved together with the Special Claddings | 1 | When 5/8 in. gypsum sheathing is used over Atlas polyiso with or without exterior sheathing on the exterior of studs (and the window opening is lined with 5/8 in. gypsum board over 16-gauge steel), the following claddings may be used. |
| a | High Pressure Laminate (HPL) exterior veneers are allowed for use when the HPL veneer and the water resistive barrier proposed for use have been successfully tested / approved together per NFPA 285. The installation requirements outbound from the 5/8 in. gypsum layer in the approval report must be followed, including all exterior layers, furring, attachment depth, and maximum air gap behind the cladding. | |
| b | Exterior veneers of NFPA 285-compliant combustible materials are allowed for use when the combustible veneer and the WRB contemplated for use have been successfully tested/approved together per NFPA 285. The installation requirements outbound from the 5/8 in. gypsum layer in the approval report must be followed, including all exterior layers, furring, attachment depth, and maximum air gap behind the cladding. As an example, Parklex Prodema Naturclad-B F wood laminate panel system installed over DuPont™ Tyvek® Firecurb HDPE Membrane water-resistive barrier per Intertek Design PUI/CWP 30-05. | |
| Flashing of Opening Perimeter (Windows, Doors, etc.) Use items 1, 2, or 3 | 1 | There is no restriction on flashings of openings for wall designs referencing compliance with NFPA 285-12, when using gypsum sheathing on the exterior of studs or Base Wall 1 or 2. |
| 2 | For wall designs referencing NFPA 285-23 or older editions of NFPA 285 with gypsum sheathing on the stud exterior, or for Base Wall 1 or 2, use the following: Header 24-gauge Steel w/ 0.040 aluminum surrounding the steel. | |
| 3 | When the Atlas polyiso is directly attached to studs with no sheathing over the exterior side of studs, use 5/8 in. Type X gypsum board on the opening perimeter, and 24-gauge (min) steel flashing shall be used. This meets NFPA 285-23 or older versions of NFPA 285. | |
| Note | Exception: When the Atlas polyiso is directly attached to studs and is covered with 1/2 in. (minimum) gypsum sheathing, 12 mm (minimum) NexGen MgO, GP DensGlass®, or DensElement®, the 24-gauge steel flashing restriction is waived if the studs are fire stopped at every floor line with mineral wool. | |
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Last Updated: 2026-06-09
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