Waterproofing - FAQs
Procor® Fluid-Applied Questions
Where should Procor be used?
Procor is intended for use as either a below grade and deck waterproofing material (with separate protection course), or as an above-grade air and vapor barrier.
Can Procor be applied to green or damp concrete?
Procor waterproofing membranes may be applied onto "green" concrete or over damp substrates. Remove any visible water prior to application. Once applied, Procor membranes will not be affected by light rain showers.
Can Procor be used for indoor waterproofing applications?
Procor membranes are water-based and virtually odorless. This makes them ideally suited for interior applications such as kitchens, mechanical rooms, bathrooms, laboratories, and wet rooms. Procor membranes are also appropriate for use in planters and other jobs where the use of solvents is restricted.
Is Procor compatible with spray applied polyurethane foam insulation?
Spray polyurethane foam insulation is compatible with Procor membranes. It will adhere to Procor when used as an exterior insulation in air and vapor barrier applications. Procor membranes adhere well to cured polyurethane foam insulation.
How are Procor membranes applied?
Procor 75 is a spray application material. Procor 10 & 20 are applied by trowel. Procor may not be applied by brush, roller or rubber squeegee.
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How do Preprufe® membranes bond to concrete?
An exceptionally strong
mechanical bond develops between Preprufe membranes and freshly poured concrete. The liquid concrete becomes interlocked with the specially formulated adhesive layers of the Preprufe membrane. The bond develops and increases in strength as the concrete cures.
Will Shotcrete bond with Preprufe® membranes?
Yes, Shotcrete bonds extremely well to Preprufe membranes, when the shotcrete is in full contact with the Preprufe. However, due to the nature of the shotcrete application, voids, rebar shadowing and pockets can be created between any waterproofing membrane (including Preprufe) and shotcrete foundation walls potentially compromising the integrity of the waterproofing system. These voids and pockets often link together forming channels which may result in areas of the shotcrete that are not in contact with the waterproofing membrane. If there is a breach in the waterproofing membrane, then these channels may allow water to travel between the waterproofing membrane and the shotcrete, eventually finding its way into the structure. Grace has developed a waterproofing system called Preprufe SCS that is specifically designed for shotcrete foundation walls. Preprufe SCS is currently the only waterproofing system Grace recommends for shotcrete foundation walls.
For more information on Preprufe SCS, and an explanation of how it solves the challenges of waterproofing shotcrete foundation walls, please
Can the release liner be left on the Preprufe® membrane to protect it during construction?
No. The release liner should be removed during application. Preprufe membranes are designed to take reasonable construction site abuse and it is difficult to remove release liner once steel has been placed.
When should I use Preprufe® 160R membrane?
Preprufe 160R is designed for vertical "blind-side" wall applications such as against timber lagging or sheet piling and is installed against a properly prepared substrate prior to concrete placement.
When should I use Preprufe® 300R membrane?
Preprufe 300R is designed for horizontal sub slab or split slab applications. The membrane is applied directly to compacted earth or a mud slab and concrete is subsequently placed directly against the membrane.
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Bituthene® Membrane Questions
What is the difference between Bituthene® 3000 and Bituthene® 4000?
Bituthene 4000 is used in conjunction with the water based Bituthene 4000 Surface Conditioner and is designed to provide superior adhesion down to -4°C (25°F). Bituthene 3000 and Bituthene Low Temperature Membrane are used in conjunction with the solvent-based Bituthene Primer B2, Bituthene Primer B2 LVC or with the water-based Bituthene WP-3000 Primer. Bituthene 3000 can be applied down to 5°C (40°F) and Bituthene Low Temperature Membrane can be applied down to -4°C (60°F).
Can Bituthene® membranes be used as a roof underlayment on a steep sloped roof?
No. Bituthene membranes are not designed to withstand the high temperatures that a roof underlayment product is exposed to. Grace Ice & Water Shield® roof leak protection is specifically designed to meet the demands of this application.
What protection courses should be used with Bituthene® membranes?
Protection of Bituthene 3000, Bituthene 4000, and Bituthene Low Temperature Membranes from site damage is critical to the success of the waterproofing system. Recommended protection courses for use over Bituthene membranes include Hydroduct® drainage composites, 3 mm (0.125 in.) or 6 mm (0.25 in.) Asphaltic Hardboard, 25 mm (1 in.) expanded polystyrene board (vertical applications only), or 6 mm (0.25 in.) extruded polystyrene fanfold board (vertical applications only). Bituthene 5000 does not require a protection course prior to placement of asphalt concrete.
What is the application temperature range for Bituthene® membranes?
Bituthene membranes are designed to be installed within specific application temperature ranges as given below:
Bituthene Low Temperature Membrane
|25°F and above|
40°F and above
25°F - 60°F
40°F and above
How long does freshly poured concrete need to cure prior to installing Bituthene® membranes?
A minimum cure period of 7 days for normal weight structural concrete and 14 days for light weight structural concrete is recommended prior to installing Bituthene membranes. Bituthene Primer B2 may be used when there is a need to install membrane over green concrete.
How long can Bituthene® membranes be left exposed to the elements?
Bituthene membranes are subject to damage from heat and sunlight and should be covered as soon as possible. Protection should be applied the same day the membrane is applied or immediately after the 24 hour flood test.
What is the roll size of Bituthene® membranes?
Bituthene 3000, Bituthene System 4000, Bituthene 5000 and Bituthene Low Temperature Membranes are sold in 200 ft2 rolls that are 0.9m x 20m (3 ft. wide by 67 ft. long).
How long do primers used with Bituthene® membranes take to dry?
Primer B2 will dry in one hour in cold applications and can also be used on damp surfaces or green concrete.
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Hydroduct® Drainage Questions
What is the appropriate Hydroduct® drainage composite for use over waterproofing membranes?
Hydroduct 220 should be used with waterproofing membranes in vertical applications and Hydroduct 660 in horizontal applications.
Do Hydroduct® drainage composites provide adequate protection for waterproofing membranes?
Hydroduct drainage composites with an integral backing film provide exceptional drainage capabilities and also provide protection for all waterproofing membranes.
How is Hydroduct 220 fastened to Bituthene and Procor membranes in vertical applications?
Bitustik Tape, a highly aggressive two sided tape, is used to adhere the Hydroduct 220 drainage composites to Bituthene membranes. Since Procor fluid applied membranes are tacky, the drainage composite can be installed over Procor without an adhesive.
Can concrete be placed directly over Hydroduct® drainage composites?
Yes, fresh concrete can be placed directly over Hydroduct 660 drainage composite.
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Perm-A-Barrier® Wall Membrane Questions
How long can Perm-A-Barrier Wall Membrane be exposed to sunlight?
Perm-A-Barrier Wall Membrane should be covered within 30 days after installation.
What temperatures can Perm-A-Barrier Wall Membrane withstand in the cavity of double wythe masonry?
The softening point of Perm-A-Barrier Wall Membrane is between 82-93 °C (180-200 °F). Temperatures greater than this may cause the membrane to liquefy and drip.
Can Perm-A-Barrier Wall Membrane be applied over asphaltic dampproofing?
Perm-A-Barrier Wall Membrane can be applied over asphaltic dampproofing when fully cured. Priming may be necessary to enhance the adhesion.
Can Perm-A-Barrier Wall Membrane be installed over EPDM (Ethylene Propylene Diene Monomer)?
Perm-A-Barrier Wall Membrane should not be installed over EPDM. However, EPDM can be installed over Perm-A-Barrier Wall Membrane.
Is metal drip edge required when using Perm-A-Barrier Wall Membrane?
Using a metal drip edge in conjunction with Perm-A-Barrier Wall Membrane would be a "belt and suspenders" detail, but is not necessary.
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