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HDPE   Self Adhesive Membrane:

HDPE   Self Adhesive Membrane


Self adhesive, polymer modified bitumen waterproofing membrane, incorporating cross laminated HDPE film




HDPE   Self Adhesive Membrane   is used to waterproof:




Retaining walls





Self adhesive - allows installation without the use of heating torches and their associated problems

Uniform thickness - eliminates any likelihood of thin application commonly found with liquid applied


Cross laminated High Density Polyethylene (HDPE) carrier film ensures dimensional stability whilst

allowing adequate flexibility during installation and service

Excellent adhesion to vertical and horizontal surface

Excellent resistance to chlorides, sulphates, alkalis and acids

Good tear and puncture resistance

Excellent tensile strength




HDPE   Self Adhesive Membrane   is a self-adhesive bituminous membrane incorporating a cross laminated HDPE film. The bitumen compounds used to manufacture the product are modified with SBS to promote maximum adhesion to the substrate. The HDPE film provides the product with excellent physical and application properties.




Top surfacing:   Cross laminated HDPE film

Thickness:   1.6 mm

Mass per unit area:   1.6 kg/m2

Softening point (R&B)   (ASTM D36)     103OC

Tensile strength (film)   (ASTM D882)     42 N/mm2 Longitudinal. 48 N/mm2 Transverse

Elongation (film)   (ASTM D882)     230% Longitudinal. 180% Transverse

Tear strength (film)   (ASTM D1004)     340 N/mm Longitudinal. 310 N/mm Transverse

Adhesion strength   (ASTM D1000)     2.0 N/mm (primed substrate). 2.4 N/mm (self)

Puncture resistance   (ASTM E154)     220 N

Hydrostatic pressure:   >50m (5 bar)

Water absorption   (ASTM D570)     0.14% @ 24 hours

Water vapour transmission   (ASTM E96)     0.06 g/   m   2/24 hours

Chemical resistance   (ASTM D543)     pH 2.0-11.5

Low temp. flexibility:   -15 C

Crack bridging ability   (ASTM C836)     >1.5 mm

Note: all values given are subject to 5-10% variation.


Specification clauses:

Where so designated on the drawing, surfaces shall have a self-adhesive modified bituminous waterproof membrane applied. The membrane shall be 1.6 mm total thickness, incorporate a cross laminated HDPE film and utilise a selvedge strip to ensure bitumen to bitumen bond at longitudinal joins. Areas shall be prepared and the membrane applied in accordance with current Technical data sheet, paying attention to priming requirements.




No special requirements, any damage identified during normal inspections to be repaired/ replaced as appropriate.


Application instructions


Surface preparation:


All surfaces must be smooth and free from contaminants and any loose material.

Rough concrete should be ‘faired up’ before application.




Self Adhesive Membrane Primer should be applied at the rate of 6 - 8 m2 / litre to surfaces. The coverage rate for the primer will vary depending on the porosity of the surface being treated. Allow the primer to dry for a minimum of 2 hours and a

maximum of 8 hours, at temperatures of 25 C and above, or until touch dry. Longer drying times will be required at lower temperatures. Priming should only be carried out on surfaces which will be covered with HDPE   Self Adhesive Membrane   the same day.




Planning the installation of the membrane is important to ensure joins occur in suitable locations and not at corners and penetrations. Longitudinal overlaps should be 50 - 60 mm and transverse laps 70 - 80 mm. Application of membrane should always start from lowest point on a surface to ensure laps are self-flashing. Apply suitable lengths of HDPE   Self Adhesive Membrane   by first carefully aligning the roll and applying an initial 300 mm of material, then pull the siliconised release paper and press the membrane on to the prepared surface. Take care not to incorporate air bubbles under the membrane or wrinkles in the membrane.


When finishing the membrane into perimeter flashings or around penetrations, use Plastiseal, a bituminous rubber mastic to assist in achieving a waterproof seal.




HDPE Self Adhesive membrane is not suitable for long term exposure to UV. The membrane should therefore be protected in some way within 3 months of application. When the membrane is to be backfilled such as with basement applications, HDPE   Self Adhesive Membrane   should be protected from physical damage by using Wrimco drainage/protection system.




Do not apply to uncured green concrete or to concrete with high moisture content levels. In such applications blistering of membrane may occur due to vapour pressure building up at interface of membrane and the substrate. Similarly,

HDPE   Self Adhesive Membrane   should not be applied to substrates subject to hydrostatic pressure from below the membrane. HDPE   Self Adhesive Membrane   must be protected from UV exposure within 3 months of application.






HDPE   Self Adhesive Membrane     1 m wide, 20 m long roll

Self Adhesive Membrane   Primer:   20 litre pail




HDPE Self Adhesive Membrane     approx. 18.9 m2 / 20 m roll allowing for overlaps

Self Adhesive Primer:   6 - 8 m2/litre

Note: No allowance has been made for wastage.




12 months in cool, dry conditions i.e. not exceeding 25 C. Storage above this temperature may reduce storage life. 


Waterproofing FAQ

Membrane Protection Board

Waterproofing Coating

Waterproof Drainage Sheet

Waterproofing Primer

Repair and Maintenance