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Protective and / or isolating layer

Interdek is a locally manufactured polyester membrane embedded in an APP modified bitumen matrix. The polyester imparts high tensile strength and is resistant to tear and puncture. Interdek is not a torch applied waterproofing membrane.

sa flag Manufactured in SA for SA conditions Download Data Sheet

Fields of Application

Interdek has been designed and developed as a protective and/
or isolating layer over the roofing membrane for receiving paving
etc, NOT as a waterproofing membrane.

  • As a nailable layer under roof sheets and roof tiles
  • As a nailable underlayer on timber boarded roofs followed
    by Unitorch 4mm
  • As a separation sheet on top of fully torched waterproofing
    membranes under tiles and brick paving


  • Extremely tear resistant
  • High tensile strength


  • Surface preparation is of paramount importance to the success
    and long-life of the system. Ensure that the surface to be
    treated is dry and sound, free of loose, dusting, flaking particles
    and free from contaminants such as grease and fungus.
  • Interdek can be loose laid or nailed using clout nails (in
    conjunction with flat washers).
  • Laps are typically 50 mm.
  • It can be cut on site with a standard cutting knife and can be
    spot bonded with Rubberised Bitumen.


Technical Data

Roll Length 20 meters
Roll Width 980 mm
Thickness 1, 2 mm nominal
Colour black
Roll Weight 18 kg nominal

Specifications are subject to change without notification. Results shown are typical but reflect test procedures used. Actual field performance will depend on installation methods and site conditions.

Download Data Sheet

Western Cape Gauteng KwaZulu-Natal Eastern Cape Mpumalanga
Cape Town 021 448 7880 Sandton 011 608 0317 Durban 031 569 1843 Port Elizabeth 021 448 7880 Nelspruit 013 752 4409
Somerset West 021 854 4760     East London 021 448 7880  
George 044 874 3905          
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