PREPRUFE® 300R Plus Membrane

Pre-applied waterproofing membrane that bond integrally to poured concrete for use below slabs or behind basement walls on confined sites

Product Description

GCP Applied Technologies (“GCP”) PREPRUFE® 300R Plus membrane is a unique composite sheet comprised of a thick HDPE film, pressure sensitive adhesive, and weather resistant protective coating. Designed with Advanced Bond Technology™ and dual adhesive ZipLap™ seams, the PREPRUFE® Plus membrane forms a unique, integral bond to poured concrete. This integral bond is specifically designed to provide a robust barrier to water, moisture and gas and prevents both the ingress and lateral migration of water.

PREPRUFE® 300R Plus Membranes are release liner free and designed for efficient, reliable installation. PREPRUFE® 300R Plus ZipLap™ seams allow for an adhesive to adhesive bond at membrane sheet overlaps and deliver superior performance in harsh conditions without the need for specialised equipment, heat or power.

Click here to download the PREPRUFE® Plus product brochure

Product Advantages

  • The unique continuous adhesive bond to concrete poured against it is designed to prevent water migration and make it unaffected by ground settlement beneath slabs.
  • Designed with fully adhered adhesive to adhesive watertight ZipLap™ seams and easy to execute detailing.
  • Designed to provide a barrier to water, moisture and gas and to physically isolate the structure from the surrounding substrate.
  • Easy roll/kick out installation reduces installation time and cost.
  • Release liner free design expedites installation and reduces construction site waste. Solar reflective surface results in reduced temperature gain.
  • Simple and quick to install requiring no priming or fillets.
  • Designed to be easily applied to permanent formwork - allows maximum use of confined sites.
  • Can be traficked immediately after application and is ready for immediate placing of reinforcement.
  • Installed membrane is unaffected by wet jobsite conditions - cannot activate prematurely.
  • Inherently waterproof as supplied. Passive non-reactive waterproofing system does not require water activation.
  • Waterproofing is not reliant on confining pressures or hydration. Membrane unaffected by freeze/thaw, wet/dry cycling.
  • Chemical resistance – designed to protect structures from salt or sulphate attack and is effective in most types of soils and waters.
  • Resistant to methane and radon gasses. Specific independent laboratory test data available on request.
  • Independent Assessments and International Certifications
    • Methane, carbon dioxide and radon gas protection in excess of the standard Membrane requirements in BRE Reports 211 (Radon) and 212 (Methane and Carbon Dioxide)
    • BBA Certificate No. 97/3325.
    • Mott MacDonald Special Services Report May 2001.  

System Components


  • PREPRUFE® 300R Plus Membrane — heavy-duty 1.2mm grade Membrane designed for horizontal and vertical use. Designed for use below slabs and on rafts (i.e. mud slabs) and for vertical blindside1 applications. Designed to accept the placing of heavy reinforcement using conventional concrete spacers. 
    Note 1: system where membrane is placed against soil retention system from where direct hydrostatic head exposure will occur. Single sided concrete form concrete form is then placed and concrete is then poured against membrane (between the single sided form and the membrane.) 

Ancillary Components: refer to the most current Data Sheets for all system components available on

  • PREPRUFE® Tape HC – high temperature Tape for covering cut edges, roll ends, penetrations and detailing at elevated temperatures (min.10°C)
  • PREPRUFE® CJ Tape HC — high temperature joint Tape for construction joints, and detailing in hot weather
  • BITUTHENE® Liquid Membrane — for sealing around penetrations, etc.
  • PREPRUFE® Tieback Covers — preformed cover for soil retention wall tieback heads 
  • For conventional concrete walls formed with two sided forms use BITUTHENE® Self-Adhesive Membrane or INTEGRITANK® Membrane on walls after removal of formwork for a fully bonded system to all structural surfaces
  • RE-INJECTO™ Re-Injectable injection hose – groutable injection tube for non moving construction joints and penetrations      
  • ADCOR® 500T Hydrophilic Waterstop - hydro-expansive waterstop for preventing saline and brackish water entry through concrete construction joints.
  • ADCOR® 550MI/ 550 T-MI Post Injectable Waterstop- hydro-expansive injectable waterstop for added security of concrete construction joints.
  • SERVITITE AT 200/SERVISEAL® AT 240 – co-extruded PVC waterstops for movement joints.

Limitations of Use

  • This data sheet is applicable specifically and only to applications in the Middle East
  • Approved uses include only those uses specifically detailed in this Product Data Sheet and other current Product Data Sheets that can be found at
  • PREPRUFE® 300R Plus membranes are not intended for any other use. Contact GCP Technical Services where any other use is anticipated or intended.  Alternate approved uses must be made in writing. 
  • Due to local regulations and practices guidance given in this data sheet is only applicable to the countries and regions shown in the footer at the end of this document when downloaded and printed in PDF format from this site. 
  • PREPRUFE® 300R Plus Membrane is designed for use where temperature of membrane will not exceed 49°C. Where it is anticipated that in service temperatures may exceed 49°C contact your local GCP Representative for more information. 
  • PREPRUFE® 300R Plus Membrane is not designed to be used with conventional two-sided formwork. 

Special informational note: PREPRUFE® 160R Plus Membrane is a companion product that is not sold or marketed for use in the Middle East

Safety and Handling

Users must read and understand the product label and Safety Data Sheets (SDS’s) for each system component before use. All users must acquaint themselves with this information prior to working with the material. Carefully read detailed precaution statements on the product labels and SDS’s before use. The most current SDS’s can be obtained from the web site or by contacting your local GCP representative for support.

Storage and Shelf Life

  • Complete shelf life and storage requirements can be found in PREPRUFE® Technical Letter #TL-0030(ME) “Shelf Life/Storage and Handling of GCP Waterproofing” at
  • Use on a first in first out basis 
  • Store in dry conditions off ground under tarps or otherwise protected from rain and ground moisture


Technical Support, Details and Technical Letters

The most up to date detail drawings and technical letters are available at or from your local GCP Representative. For complete detailed application instructions, please refer to the current GCP Applied Technologies Contractor Handbook and Literature on ( Documents in hardcopy as well as information found on websites other than may be out of date or in error. Before using this product it is important that information be confirmed by accessing Review the most recent product information, including without limitation Product Data Sheets, Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations. It is important to review all support materials prior to installation of PREPRUFE® 300R Plus membrane. 

Support is also available on all matters by full-time technically trained GCP field sales representatives and technical service personnel, backed by a central research and development technical services staff. For technical assistance with detailing and problem solving please contact your local in country GCP representative. 

Temperature Requirements

  • PREPRUFE® 300R Plus membranes can be applied at temperatures of 25°F (-4°C) or above.
  • PREPRUFE® 300R Plus membranes are designed for in-service temperatures below 120°F (49°C).



Suitable substrates include properly prepared:

  • concrete blinding
  • well compacted sand on rolled crushed stone
  • rigid insulation
  • clay heave boards
  • permanent formwork
  • removable formwork
  • 19 mm plywood
  • HYDRODUCT® drainage sheets
  • Adjacent sub-structures

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 applied 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 12 mm out of alignment. HYDRODUCT® 200 or 220 drainage sheet can be used to bridge voids, gaps and out of alignment up to 50mm prior to PREPRUFE® 300R Plus membrane installation. 

Installation - General

Please refer to PREPRUFE® (300R Plus) Membrane Application Manual for detailed instructions.

PREPRUFE® 300R Plus membranes have coloured ZipStrips™ at the top and bottom of the seam area on the edge of the roll. Both ZipStrips™ cover an aggressive adhesive. Once the yellow ZipStrip™ on the top of the membrane and the blue ZipStrip™ 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 specialised equipment, heat or power.

Horizontal substrates –

PREPRUFE® 300R Plus membrane can be applied in horizontal applications to smooth prepared concrete, carton forms or well rolled and compacted earth or crushed stone substrate. Kick out or roll out the membrane HDPE film side to the substrate with the yellow ZipStrip™ facing towards the concrete pour. End laps must be staggered to avoid a buildup of layers. Leave the yellow and blue ZipStrips™ on the membrane until overlap procedure is completed. When placement of the membrane is completed remove ZipStrips™. Allowing the two adhesive layers to contact each other and form the ZipLap™ bond.  When installing over carton forms, contact your local GCP representative.

Accurately position each succeeding sheet to overlap the previous sheet 75 mm along the marked selvedge with the blue ZipStrip™ 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 ZipStrips™ 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.

  • PREPRUFE® 300R Plus membrane can be returned up the inside face of slab formwork to attain a fully bonded system and to allow a tie in with BITUTHENE® self-adhered membrane PROCOR® or SILCOR® fluid-applied membrane, or INTEGRITANK® membrane to all vertical structural surfaces after removal of formwork. 

Vertical substrates – 

PREPRUFE® 300R Plus membranes can be applied vertically to permanent formwork or adjoining structures. Mechanically fasten the membrane vertically using fasteners appropriate for the substrate with the yellow ZipStrip™ facing towards the concrete pour. The membrane may be installed in any convenient length. Fastening should be made through the selvedge within 12mm of the leading edge of the membrane 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 75 mm along the marked selvedge with the blue ZipStrip™ 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 the release liner covering both the yellow and blue ZipStrips™ in the overlap area to achieve an adhesive to adhesive bond at the overlap. Roll firmly to ensure a watertight seal.

Note that PREPRUFE® 300R Plus membranes must not be used with conventional two-sided formwork. 

Alternate Vertical Wall Waterproofing Options

GCP also offers alternatives to pre-applying PREPRUFE® 300R Plus to vertical formwork. For conventional application to walls after formwork removal use BITUTHENE® 8000HC Membrane- self-adhesive sheet waterproofing membrane or INTEGRITANK® spray applied seamless waterproofing membrane. See separate data sheet and installation instructions and drawings for further information at or contact your GCP representative. 

Roll ends and cut edges – 

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

Internal & External Corners and Penetrations

Refer to the most current detail drawings and instructions available at or from your local sales representative. 

Membrane Repair

Inspect the membrane before installation of reinforcement steel, formwork and final placement of concrete. The membrane can be easily cleaned by low pressure 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 other contaminants and allow the membrane to dry. Repair small punctures and slices 12 mm or less by applying PREPRUFE® Tape centred over the damaged area. Repair punctures and holes larger than 12mm by applying a patch of PREPRUFE® membrane. Extend the patch 150 mm beyond the damaged area. Seal all edges of the patch 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. Any areas of damaged membrane must be covered with PREPRUFE® Tape. All PREPRUFE® Tape must be rolled firmly and the tinted release liner removed.

Slices or relief cuts can be butted or overlapped and repaired by applying PREPRUFE® Tape centred over the edge of the overlap or centre of the butt joint. Where it is not possible to create a butt joint or overlap, repair with fresh membrane and PREPRUFE® Tape as detailed above.

Pouring of Concrete

Under most climatic conditions concrete should be poured within 56 days of membrane installation. Where ambient temperatures will exceed 38˚C for more than a total of 7 days, concrete should be placed within 42 days of installation of the membrane. Concrete must be placed and compacted carefully to avoid damage to the Membrane. Never use a sharp object to consolidate the concrete.

Removal of Formwork

PREPRUFE® Plus membranes can be applied to slab perimeter formwork, pile caps, etc. Once concrete is poured the formwork must remain in place until the concrete has gained sufficient compressive strength to develop the surface bond with PREPRUFE® 300R Plus Membrane. A minimum concrete compressive strength of 20 N/mm2 is recommended prior to stripping formwork supporting PREPRUFE® 300R Plus membranes. Premature stripping may result in loss of adhesion between the membrane and concrete.


Roll size1 1.17 m x 31.15 m
Roll weight1 49 kg
Minimum side and end laps2 75 mm
Note1: Individual roll length and weight may vary +/- 1%
Note 2: Overlap Allowance: Be sure to account for the minimum side & end laps (ovelaps) when calculating coverage     

Membrane: Ancillary Components: The most current supply information for ancillary products can be found at

Physical Properties

Colour White  
Thickness 1.2 mm ASTM D3767
Peel Adhesion to Concrete 880 N/m ASTM D9034
Resistance to Hydrostatic Head Pass at 71m ASTM D53852
Lateral Water Migration Resistance Pass at 71 m of hydrostatic head ASTM D53851
Low Temperature Flexibility Unaffected at -29°C ASTM D1970
Puncture Resistance 890 minimum7 ASTM E 154
Elongation 400% minimum ASTM D4123
Tensile Strength, Film 27.6 MPa ASTM D4128
Crack Cycling at -23°C 100 cycles Pass ASTM C8366
Lap Peel Adhesion 1408 N/m ASTM D18765
Permeance to Water Vapor Transmission (HDPE side exposed) <0.0 perms/
(5.74 ng/(Pa x s x m2))
ASTM E96, method B
Water Absorption 0.5% ASTM D570
Resistance to impact (AI board (mm) - MLV) ≥400 EN 12691
Durability of water tightness against ageing/degradation Pass EN 1296
EN 1928
Method B
Durability of water tightness against chemicals at 60kPa Pass EN 1847
Method B
EN 1928
Method B
Compatibility with bitumen Pass EN 1548
Resistance to static loading ≥20 Pass EN 12730
Methane permeability, Radon Diffusion Independent laboratory reports available on request  
*MDV: the Manufacturers Declared Value: ** MLV: the Manufactured Limiting Value: *** No Declared Performance
All declared values are based in test results determined under laboratory conditions and with product samples taken from original stock.
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 measures the resistance of later 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 3 mm spacer is inserted perpendicular to the Membrane to create a gap. The cured block (cured min. 7 days) 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 50 mm per minute.
4.    Concrete is cast against the protective coating surface of the Membrane and allowed to properly cure (7 days minimum). Peel adhesion of Membrane to concrete is measured at a rate of 2 in. (50 mm) per minute at room temperature
5.    The test is conducted 15 minutes after the lap is formed and run at a rate of 50 mm per minute.
6.    Test conducted at -23°C
7.    Independent Laboratory Test Values available on request
8.    Result is published for HDPE carrier film run at a rate of 500mm per minute | United Arab Emirates customer service: +971 4 5139560

We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate, and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations, and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation, or suggestion is intended for any use that would infringe any patent, copyright, or other third party right.

PREPRUFE is a trademark, which may be registered in the United States and/or other countries, of GCP Applied Technologies, Inc. This trademark list has been compiled using available published information as of the publication date and may not accurately reflect current trademark ownership or status.

© Copyright 2019 GCP Applied Technologies, Inc. All rights reserved.

GCP Applied Technologies Inc., 62 Whittemore Avenue, Cambridge, MA 02140, USA

This document is only current as of the last updated date stated below and is valid only for use in the UAE. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.

Last Updated: 2021-05-18