Polymer modified root inhibiting waterproofing membrane

  • Resistant to root perforations
  • Resistant to fertilizers and pesticides
  • Resistant to water borne chemicals

Features and benefits

High performance, polymer modified bituminous membrane additivated with a root inhibiting chemical for resisting the attack of roots, fertilizers and insecticides.



POLYBIT® BITUPLUS AR 4000 can be used for waterproofing of roof gardens, flower containers, underground boxes, and retaining walls. 4 Waterproofing in soil or growing medium, paving or corner supports, block paving on sand.
Available pack size: 4mm

Documents and downloads

How to use


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
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.


Unroll and align BITUPLUS AR 4000 rolls and re-roll
correctly before torching. 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. 


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 PG
or any other mastic sealant 

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Frequently asked questions

It is recommended using solvent based bitumen primer conforming to ASTM D 41

Yes. It msut be protected from damages that may happen during the site activities.

No. It is not necessary to use bonding agents or twin sided tape for fixing on torch applied membranes. It can be applied by torching.