SBS modified bituminous wa terproofing membrane


BITUPLUS E 5270 is a bituminous waterproofing membrane manufactured by blending a mixture of bitumen and SBS (Styrene Butadiene Styrene) polymers to obtain excellent waterproofing and low temperature flexibility properties. The polymerized bitumen is coated onto a dimensionally stable reinforcement core of non woven spun bond polyester rot-proof fabric.


  • Excellent resistance to positive water & vapor pressure 
  • Good dimensional stability under tension Excellent flexibility. Can accommodate high structural movements 
  • High puncture and fatigue resistance 
  • Excellent tensile and tear strengths 
  • High resistance against water borne chemicals 
  • Exhibits good low temperature flexibility with no physical strain

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

The application temperature should be between 5°C to 55°C. Application procedures may vary slightly depending upon site conditions.


The surface shall be cleaned thoroughly of all contaminants like dust, traces of curing compound, oil and grease. All surface imperfections, protrusions, structurally unsound and friable concrete must be removed and repaired.


Apply POLYPRIME SB* (Solvent based primer) @4-6 m²/lt to a clean, smooth and dry surface by brush, roller or spray. Allow the primer to dry prior to the application of the membrane. The primer promotes the adhesion between the membrane and the concrete surface.


Start the installation of all membrane plies from the low point or drains, so that the flow of water is over or parallel to the plies, but never against the laps. All overlaps at the membrane seams shall be installed so as to have "up" slope laps over "down" slope laps. Begin membrane application by unrolling the roll of BITUPLUS E 5270 membrane and aligning the side laps. Side overlaps should be a minimum of 100 mm and the end overlaps 150mm.


BITUPLUS E 5270 membrane is installed by using a cylinder fed propane gas torch. Use of hand-held roofing torch is recommended as it affords a good control. Begin torching the embossed polyethylene side of the rolled portion of the membrane. As the membrane is heated the embossing starts to melt away exposing a shiny bitumen surface. Roll forward the membrane and press firmly with the boot or roller against the substrate to bond well. The propane flame should be moved from side to side and up the lap edge while the membrane is slowly unrolled and adhered to the underlying surface.
Caution: Do not over torch the membrane as this will expose the reinforcement and cause damage to it.


Heat both the overlaps and use round tipped trowel to seal the overlap. Adequate heat is confirmed when a uniform flow of melted bitumen compound flows evenly in a bead that oozes from the applied membrane’s edges. Excess compound should be pressed into the seam using a heated trowel. Any un-bonded areas must be lifted and re-torched.


BITUPLUS E 5270 should be protected from getting damaged due to the ongoing site activities and during backfilling. Membranes laid on horizontal surfaces can be protected either by a cement sand screed (50mm thick) or by an asphaltic protection board (BITUBOARD)*. On vertical surfaces the membrane has to be protected with BITUBOARD. BITUBOARD can be fixed on the membrane by torching the underside of the board, or with a double sided bitumen adhesive tape (BITUTAPE TS)*.