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Polyurethane Waterproofing of Concrete Roof Slab:

Polyurethane waterproofing of concrete roof slab consists of two pack clear/pigmented Aliphatic Polyurethane using Polyether Polyols with Isocyanate for rendering flame resistant characteristic. The two pack system consisting of pigment and the solvent (Xylene/Toluene, no filter) is mixed in definite ratio by weight strictly as per manufacturers specification for preparing the coating for application. The coating will have physical features like high resistance to impact, abrasion and cracking, superior tensile strength (80 Kg/cm2 after 4 weeks at ambient temperature) and perfectly smooth, dust free glossy finish retained at least upto 3 years. It should also be resistant to acid, alkalies and have a very low water absorption rate (0.5% maximum at ambient temperature after 7 days).

Concrete Polyurethane Waterproofing Procedure:

1. Preparation of Concrete Surface

The roof surface is thoroughly cleaned with a wire brush and all foreign matter etc. is removed. Well defined cracks on the surface is cut to "V section, cleaned and filled up with a paste of 2 component Polyurethane based crack filling compound and white cement in a ratio of 1:2.

2. Primer Coat Application

It consists of two pack Polyurethane. Primer coat is mixed in the ratio as per Manufacturers' specification. A single coat of this primer is applied by brush over the prepared bed as an adhesion coat. The primer is then allowed to dry for a minimum of 8 hours time before the successive finishing coats of PU are applied.

3. Finishing Coat of Polyurethane Waterproofing on Concrete:

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