Product Description

PREPRUFE® 300R Plus LT & 160R Plus LT membranes are unique composite sheets comprised of a thick HDPE film, a pressure sensitive adhesive designed for installation between 25°F (-4°C) and 60°F (16°C) and weather resistant protective coating. Designed with Advanced Bond Technology™ and a dual adhesive ZipLap™, PREPRUFE® Plus membranes form a unique, integral bond to poured concrete, preventing both the ingress and lateral migration of water while providing a robust barrier to water, moisture and gas.

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Preprufe Plus Low Temperature Membrane Application

Release liner free and designed for efficient, reliable installation, the PREPRUFE® Plus ZipLap allows for an adhesive to adhesive bond at seam overlaps and delivers superior performance for low temperature installations. The PREPRUFE® Plus LT System includes:

  • PREPRUFE® 300R Plus LT- heavy-duty grade for use below slabs and on rafts (i.e. mud slabs). Designed to accept the placing of heavy reinforcement using conventional concrete spacers.
  • PREPRUFE® 160R Plus LT - thinner grade for blindside, zero property line applications against soil retention systems. For vertical use only.
  • PREPRUFE® Tape LT - for covering cut edges, roll ends, penetrations and detailing.
  • PREPRUFE® CJ Tape LT - for construction joints, and detailing.
  • BITUTHENE® Liquid Membrane - for sealing around penetrations, etc.
  • ADCOR® ES - waterstop for joints in concrete walls and floors
  • PREPRUFE® Tieback Covers - preformed cover for soil retention wall tieback heads
  • PREPRUFE® Preformed Corners - preformed inside and outside corners

PREPRUFE® 300R Plus LT & 160R Plus LT membranes are applied either horizontally to smooth prepared concrete, carton forms or well rolled and compacted earth or crushed stone substrate; or vertically to permanent formwork or adjoining structures. Concrete is then cast directly against the adhesive side of the membranes. The specially developed PREPRUFE® adhesive layers work together to form a continuous and integral seal to the structure.

PREPRUFE® membranes can be turned up the inside face of slab formwork but is not recommended for conventional twin-sided formwork on walls, etc. Use BITUTHENE® self-adhesive membrane or PROCOR® fluid-applied membrane to walls after removal of formwork for a fully bonded system to all structural surfaces.

Product Advantages

  • Forms a unique continuous adhesive bond to concrete poured against it- prevents watermigration and makes it unaffected by ground settlement beneath slabs
  • Fully-adhered adhesive to adhesive watertight ZipLaps™ and easy to execute detailing
  • Provides a barrier to water, moisture and gas - physically isolates the structure from the surrounding ground
  • Easy roll/kick out installation - reduces installation time and cost
  • Release liner free - expedites installation and reduces construction site waste
  • Solar reflective - reduced temperature gain
  • Simple and quick to install at temperatures down to 25°F (-4°C)—requiring no priming or taping of side laps
  • Can be applied to permanent formwork - allows maximum use of confined sites
  • Self protecting - can be trafficked immediately after application and ready for immediate placing of reinforcement
  • Unaffected by wet conditions - cannot activate prematurely
  • Inherently waterproof, non-reactive system:
    • Not reliant on confining pressures or hydration
    • Unaffected, wet/dry cycling
  • Chemical resistant - effective in most types of soils and waters, protects structure from salt or sulphate attack

Installation

The most current application instructions, detail drawings and technical letters can be viewed on the web site. For other technical information contact your local GCP representative.

PREPRUFE® Plus membranes have colored zip strips at the top and bottom of the seam area on the edge of the roll. Both zip strips cover an aggressive adhesive. Once the yellow zip strip on the top of the membrane and the blue zip strip on the bottom of the membrane are removed, a strong adhesive to adhesive bond is achieved in the overlap area. This PREPRUFE® ZipLap™ provides an enhanced sealing of the overlaps in harsh conditions combined with a fast and easy way of execution without specialized equipment, heat or power.

Substrate Preparation

All surfaces - It is essential to create a sound and solid substrate to eliminate movement during the concrete pour. Substrates must be regular and smooth with no gaps or voids greater than 0.5 in. (12 mm). Grout around all penetrations such as utility conduits, etc. for stability.

Horizontal - The substrate must be free of loose aggregate and sharp protrusions. Avoid curved or rounded substrates. When installing over earth or crushed stone, ensure substrate is well compacted to avoid displacement of substrate due to traffic or concrete pour. The surface does not need to be dry, but standing water must be removed.

Vertical - Use concrete, plywood, insulation or other approved facing to sheet piling to provide support to the membrane. Board systems such as timber lagging must be close butted to provide support and not more than 0.5 in. (12 mm) out of alignment.

Roll ends and cut edges - Overlap all roll ends and cut edges by a minimum 3 in. (75 mm) and ensure the area is clean and free from contamination, wiping with a damp cloth if necessary. Allow to dry and apply PREPRUFE® Tape LT centered over the lap edges and roll firmly. Immediately remove tinted plastic release liner from the tape.

Details

Detail drawings are available on the web site.

Membrane Repair

Inspect the membrane before installation of reinforcement steel, formwork and final placement of concrete. The membrane can be easily cleaned by power washing if required. Repair damage by wiping the area with a damp cloth to ensure the area is clean and free from dust, and allow to dry. Repair small punctures (0.5 in. (12 mm) or less) and slices by applying PREPRUFE® Tape centered over the damaged area. Repair holes and large punctures by applying a patch of PREPRUFE® Plus membrane, which extends 6 in. (150 mm) beyond the damaged area. Seal all edges of the patch with PREPRUFE® Tape. Any areas of damaged adhesive should be covered with Preprufe Tape. Where exposed selvedge has lost adhesion or laps have not been sealed, ensure the area is clean and dry and cover with fresh PREPRUFE® Tape. All PREPRUFE® Tape must be rolled firmly and the tinted release liner removed. Alternatively, use a hot air gun or similar to activate the adhesive using caution not to damage the membrane and firmly roll lap to achieve continuity.

Pouring of Concrete

Ensure the plastic release liner is removed from all areas of PREPRUFE® Tape. It is recommended that concrete be poured within 56 days (42 days in hot climates) of application of the membrane. Following proper ACI guidelines, concrete must be placed carefully and consolidated properly to avoid damage to the membrane. Never use a sharp object to consolidate the concrete. Provide temporary protection from concrete over splash for areas of the PREPRUFE® membrane that are adjacent to a concrete pour.

Membrane Installation

PREPRUFE® Plus Low Temperature membranes can be applied at temperatures between 25°F (-4°C) and 60°F (16°C). Unlike PREPRUFE® 300R Plus & 160R Plus which require the addition of PREPRUFE® Tape LT at the side laps at temperatures below 40°F (4°C), PREPRUFE® 300R Plus LT & 160R Plus LT do not require side laps to be taped.

Horizontal substrates - Kick out or roll out the membrane HDPE film side to the substrate with the yellow zip strip facing towards the concrete pour. End laps should be staggered to avoid a build up of layers. Leave yellow and blue zip strips on the membrane until overlap procedure is completed. Accurately position succeeding sheets to overlap the previous sheet 3 in. (75 mm) along the marked selvedge with the blue zip strip on top of the yellow zipstrip. Ensure the underside of the succeeding sheet is clean, dry and free from contamination before attempting to overlap. Peel back and remove both the yellow and blue zip strips in the overlap area to achieve an adhesive to adhesive bond at the overlap. Ensure a continuous bond is achieved without creases and roll firmly with a heavy roller. Refer to GCP tech letter 15 for information on suitable rebar chairs for PREPRUFE® products.

Vertical substrates - Mechanically fasten the membrane vertically using fasteners appropriate to the substrate with the yellow zip strip facing towards the concrete pour. The membrane may be installed in any convenient length. Fastening can be made through the selvedge using a small and low profile head fastener so that the membrane lays flat and allows firmly rolled overlaps. Accurately position succeeding sheets to overlap the previous sheet 3 in. (75 mm) along the marked selvedge with the blue zip strip on top of the yellow zip strip. Ensure the underside of the succeeding sheet is clean, dry and free from contamination before attempting to overlap. Peel back and remove both the yellow and blue zip strips in the overlap area to achieve an adhesive to adhesive bond at the overlap. Roll firmly to ensure a watertight seal.

Removal of Formwork

PREPRUFE® membranes can be applied to removable formwork, such as slab perimeters, elevator and lift pits, etc. Once the concrete is poured the formwork must remain in place until the concrete has gained sufficient compressive strength to develop the surface bond. PREPRUFE® membranes are not recommended for conventional twin sided wall forming systems, see GCP tech letter 13 for information on forming systems used with PREPRUFE®.

A minimum concrete compressive strength of 3000 psi (20 N/ mm2) is recommended prior to stripping formwork supporting PREPRUFE® membranes. Premature stripping may result in displacement of the membrane and/or spalling of the concrete.

Refer to GCP Tech Letter 17 for information on removal of formwork for PREPRUFE®.

Specification Clauses

PREPRUFE® 300R Plus LT & 160R Plus LT membranes shall be applied with its protective coating presented to receive fresh concrete to which it will integrally bond. Only GCP approved membranes shall be bonded to PREPRUFE® products. All PREPRUFE® system materials shall be supplied by GCP, and applied strictly in accordance with their instructions. Specimen performance and formatted clauses are also available.

NOTE: Use PREPRUFE® Tape to tie-in PROCOR® fluid-applied membrane with PREPRUFE® products.

Health and Safety

Refer to relevant Safety Data Sheet. SDS can be obtained from our web site or by contacting us toll free at 866-333-3SBM (3726). Complete rolls should be lifted and carried by a minimum of two persons.

Supply

Dimensions (Nominal) PREPRUFE® 300R Plus LT Membrane PREPRUFE® 160R Plus LT Membrane PREPRUFE® Tape LT
Thickness 0.046 in. (1.2 mm) 0.032 in. (0.8 mm)  
Roll size 3ft. 10 in. x 102 ft. (1.17m x 31.15m) 3 ft. 10 in. x 120 ft. (1.17m x 36.3m) 4 in. x 49 ft (100 mm x 15 m)
Roll area 392 ft2 (36 m2) 460 ft2 (42 m2)  
Roll weight 108 lbs (50kg) 92 lbs (42kg) 4.3 lbs (2 kg)
Minimum side/end laps 3 in. (75 mm) 3 in. (75 mm) 3 in. (75 mm)

Physical Properties

Property Typical Value PREPRUFE® 300R Plus LT Typical Value PREPRUFE® 160R Plus LT Test Method
Color white white  
Thickness 0.046 in. (1.2 mm) 0.032 in. (0.8 mm) ASTM D3767
Lateral Water Migration Resistance Pass at 231 ft (71 m) of hydrostatic head pressure Pass at 231 ft (71 m) of hydrostatic head pressure ASTM D5385, modified1
Low temperature flexibility Unaffected at -20°F (-29°C) Unaffected at -20°F (-29°C) ASTM D1970
Resistance to hydrostatic head 231 ft (71 m) 231 ft (71 m) ASTM D5385, modified2
Elongation 500% 500% ASTM D412, modified3
Tensile strength, film 4000 psi (27.6 MPa) 4000 psi (27.6 MPa) ASTM D412
Crack cycling at -9.4°F (-23°C), 100 cycles Unaffected, Pass Unaffected, Pass ASTM C8364
Puncture resistance 221 lbs (990 N) 100 lbs (445N) ASTM E154
Peel adhesion to concrete 5 lbs/in. (880N/m) 5 lbs/in. (880N/m) ASTM D903, modified5
Lap peel adhesion at 60°F (16°C) 8 lbs/in. (1408 N/m) 8 lbs/in. (1408 N/m) ASTM D1876, modified6
Lap peel adhesion at 25°F (-4°C) 8 lbs/in. (1408 N/m) 8 lbs/in. (1408 N/m) ASTM D1876, modified6
Permeance to water vapor transmission 0.01 perms (0.6 ng/(Pa x s x m2)) 0.01 perms (0.6 ng/(Pa x s x m2)) ASTM E96, method B

Footnotes:
1. Lateral water migration resistance is tested by casting concrete against membrane with a hole and subjecting the membrane to hydrostatic head pressure with water. The test measure the resistance of lateral water migration between the concrete and the membrane.
2. Hydrostatic head tests of PREPRUFE® Membranes are performed by casting concrete against the membrane with a lap. Before the concrete cures, a 0.125 in. (3 mm) spacer is inserted perpendicular to the membrane to create a gap. The cured block is placed in a chamber where water is introduced to the membrane surface up to the head indicated.
3. Elongation of membrane is run at a rate of 2 in. (50 mm) per minute.
4. Concrete is cast against the PREPRUFE® membrane and allowed to cure (7 days minimum)
5. Concrete is cast against the protective coating surface of the membrane and allowed to properly dry (7 days minimum). Peel adhesion of membrane to concrete is measured at a rate of 2 in. (50 mm) per minute at room temperature.
6. The test is conducted 15 minutes after the lap is formed (per GCP published recommendations) and run at a rate of 2 in. (50 mm) per minute at 72°F (22°C).