Apco Build ISO

Flex PU WB

Flex PU WB

Providing waterproofing treatment to the Terrace concrete / roof ( directly exposed to UV)


Waterproofing treatment to Terrace concrete / roof ( Directly exposed to UV) with Apcobuild Flex PU WB of apcotex industries ltd. Single component liquid applied system based on an advance polyurethane modified water based polymer forming seamless elastomeric flexible waterproofing membrane. The waterproof membrane on exposure to ultra violet radiation with excellent weathering, crack bridging properties.


  • Concrete Terrace / Roof (Directly Exposed to UV)
  • Metal Roofs
  • Podiums

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    • Clean the surface thoroughly with mechanically means and make the surface free from dirt and loose material
    • In existing old terraces with brickbat coba or screeds , the substrate must be checked for its soundness.
    • Damaged or hollow portions, sharp edges must be cut and removed till the mother slab.
    • The slab should be recoated with slurry of Apcobuild Seal n safe and cement (1 :1) proportion. After drying the brickbat coba in that proportion should be reinstated by mixing Apcobuild Seal N Safe in base slurry.
    • In other areas where the coba is sound, the surface cracks must be filled with Apcobuild Crackfiller paste or polymer modified mortar.
    • Dilute Apcobuild Flex PU WB with water in 1:1 mixing ratio as a primer coat, then pour Apcobuild Flex PU WB into these cracks and wait for it to dry.
    • Bitumen based waterproofing treatments if existing, must be completely removed by mechanical scarification or by any other effective mechanical means.

    • Pre wetting the area
    • Once the area is cleaned, saturate the entire surface with water and allow water to stand on the surface for 12 hours.
    Application of Apcobuild Flex PU WB - Priming:
    • Dilute 1 parts of Apcobuild Flex PU WB with 1 part water. Allow it to dry for 6 to 8 hours. Method of application:
    • All pipe inlets and outlets are sealed with Tape TAPE. Tape to the wall/floor joints, including overlaps, internal/ external corner pieces and sealing of pipe inlets and outlets.
    • Apply Apcobuild Flex PU WB by brush, roller. Apply first coat of Apcobuild Flex PU WB without any dilution & allow it to dry. After the coat dries start applying second coat of Apcobuild Flex PU WB. This improves the performance of the coating dramatically, to take care all movements in cracks and cold joint in the substrate caused by variation of high and low temperature. Drying time between two coats will be 6 to 8 hours. Allow the system to air cure for 7 days minimum. A total thickness of 1 to 1.2 mm must be achieved when Apcobuild Flex PU WB is dry 7 days after application.

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