APP Modified Torch Applied Bitumen Water Proofing Membrane


POLYPLUS P 4160 is an APP modified bitumen waterproofing membrane, manufactured from a rich mixture of bitumen and selected polymers (Atactic Poly Propylene) blended together to obtain excellent heat, UV resistance and waterproofing properties. Polymerized bitumen then coated on to a dimensionally stable non-woven spun bond polyester fabric to obtain excellent tensile & tear strengths and puncture resistance.


  • High resistance to positive water & vapor pressure. 
  • Good dimensional stability under tension. 
  • Good flexibility. 
  • Can accommodate structural movements. 
  • Resists water borne chemicals. 
  • High heat resistance.

This TDS is applicable for the United Arab Emirates only. Please contact your local Polybit sales office for the available TDS in your region

Step by step

Application procedure may vary slightly depending upon site conditions. However below given are general guidelines.


The surface where the membrane will be laid is to be made clean and dry. All surface imperfections and protrusions are to be removed and repaired. Structurally unsound and friable concrete must be removed and repaired with a suitable repair mortar.


Apply Polyprime SB @ 4-6m2/lt. as per ASTM D 41 to a clean smooth and dry surface by brush, roller or spray. Refer primer data sheet for more details. Allow the primer to dry.


Unroll and align POLYPLUS P 4160 and re-roll correctly before torching. Overlap should be minimum of 100 mm.


Use gas burner to heat substrate and underside of POLYPLUS P 4160. Embossing on the lower face of the membrane allows a fast safe lying. When embossing disappears after torching the membrane is ready to stick. Roll forward and press firmly against the substrate to bond.

Caution: Do not over torch as this will expose the reinforcement in the membrane and cause damage to it.


Heat both the overlaps and use round tipped trowel to seal the overlap. Excess compound should be smoothened and pressed into seam using hot trowel.


All angles and abutments should be sealed with extra care to ensure full bondage. Seal the edges well into the grooves and protect with Polyseal PS or any other mastic sealant.