Polymer modified root inhibiting waterproofing membrane


BITUPLUS AR 4000 is a high performance, polymer modified bituminous membrane additivated with a root inhibiting chemical for resisting the attack of roots, fertilizers and insecticides. this membrane is specifically used for waterproofing of structures in contact with earth in presence of vegetation. BITUPLUS AR 4000 membranes are made from non-woven polyester which are saturated and coated with a homogenous plasto-elastomeric blend of polymers, distilled bitumen and stabilizers. the mixture is carefully produced under controlled conditions to ensure its stability at high temperatures.


  • Resistant to root perforations.
  • Resistant to fertilizers and pesticides.
  • Resistant to water borne chemicals.
  • Suitable for heavy-duty application.
  • Excellent resistance to puncture.
  • Exceptional dimensional stability under pressure.
  • High tolerance to thermal shock.
  • Impermeable to water and vapor.

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 @ 4-6 m²/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 Alignment unroll and align BITUPLUS AR 4000 rolls and re-roll correctly before torching. An overlap should be minimum of 100 mm.


Use gas burner to heat substrate and underside of BITUPLUS AR 4000 Embossing on the lower face of the membrane allows a fast and safe laying. 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.