POLYBIT Plastifelt

Fibre reinforced polymer modified bituminous waterproofing membrane

  • Excellent resistance to positive water & vapor pressure
  • Good dimensional stability under tension
  • Good flexibility. Can accommodate structural movements

Features and benefits

Polymer modified bituminous waterproofing membrane, manufactured from a mixture of bitumen and selected polymers, which are blended together to obtain good waterproofing properties. The bitumen compound also exhibits high heat and UV resistance properties.



POLYBIT® PLASTIFELT is used as waterproofing membrane on inverted roofs & parapet, terraces, balconies & patios, sunken slabs, bridges & tunnels, airport aprons & ramp areas, concrete foundations & footings, basements, pile heads, swimming pools & water retaining structures (externally).
Available pack size: 3 & 4mm

Documents and downloads

How to use


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 with a suitable Polycrete* concrete repair mortar.
Apply Polyprime SB*(Solvent based primer) @ 4-6 m²/L
to a clean smooth and dry surface by brush, roller or
spray. Allow the primer to dry prior to the application of
the membrane. As the viscosity of the primer is low, it
easily penetrates into the concrete pores which promotes
adhesion between the membrane and the concrete surface.


Start the installation of all membrane plies from the low
point or drains, so 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 Plastifelt membrane and
aligning the side laps.Re-roll the roll halfway and stand
on the unrolled portion to prevent shifting. Side overlaps
should be a minimum of 100 mm and the end overlaps
Plastifelt membranes are installed by using a cylinder
fed propane gas torch.Use of hand-held roofing torch
is recommended as it affords a good control.If multiple
burner torching machines are utilized, care must be taken
to ensure the application of uniform heat and avoid
overheating the membrane. Begin torching the embossed
polyethylene side of the rolled portion of the membrane.
Proper torching procedure involves passing the torch flame
in an ”L” pattern applying about 75 percent of the heat
across the coiled portion of the roll and 25 percent across
the substrate, including the lap area of the previously
installed 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 


Flashing details are accomplished using cut pieces of
Plastifelt membrane in combination with appropriate
prefabricated flashing components.The same side lap
and end lap rules apply to flashing details as to field
membrane. All angles and abutments should be sealed
with extra care to ensure full bonding. An appropriate
flashing membrane (mineral surface membrane) shall
be lapped with the base membrane and taken up on
the parapet wall and tucked into a groove cut into the
concrete. The grooves will be sealed with a suitable mastic
sealant (Bitumastic)*. 

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    A quick drying solvent based low viscosity bitumen primer. It is used as a primer coat on masonry and concrete substrates to improve the adhesion of bitumen based membranes and coatings. 
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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.