Heat-Reflective Roof Waterproofing in Dehradun: How It Works and How to Apply It

A terrace in Dehradun takes a hard life: strong summer sun that heats the slab, then months of monsoon rain that find every hairline crack. The product shown in our video, a heat-reflective roof coating from Kamdhenu Paints, is aimed at both problems at once.

Why terraces leak

Concrete expands in the afternoon heat and contracts at night. Over years this opens fine cracks, especially at joints, around pipes and where the parapet meets the slab. In the monsoon, water enters those cracks and shows up as damp patches, peeling paint and seepage on the ceiling below.

What a heat-reflective coating does

A roof coating of this type forms a continuous, flexible film over the surface. Light-coloured reflective pigments send part of the sun's heat back, so the slab does not heat up as much. A cooler slab moves less, and the film keeps water out. Ask for the maker's data sheet for coverage and the expected number of coats for your surface.

Preparing the roof

Most failures are caused by poor preparation, not poor paint.

1. 1Sweep and wash the terrace, and remove loose plaster, moss and old flaking coatings.
2. 2Repair cracks and fill depressions where water collects, and let the repair cure fully.
3. 3Treat the joint between the floor and the parapet wall, and the base of pipes and water tanks.
4. 4Make sure the surface is completely dry before the first coat.

Applying it

1. 1Apply a primer if the product data sheet asks for one.
2. 2Brush or roll the first coat evenly and let it dry for the time on the label.
3. 3Apply the second coat in the opposite direction to the first, so no pinholes remain.
4. 4Keep the terrace free of foot traffic until the coating has cured.

Work in dry weather. In Dehradun the best window is the dry months before the monsoon, roughly April to early June.

Inside walls matter too

If damp has already reached your ceiling or wall, fix the source on the roof first and only then repaint inside. A good primer such as wall primers helps the new finish hold on a repaired wall.

Related reading

For a full seasonal checklist see our monsoon protection guide. For tougher exterior walls look at Asian Paints Apex Ultima Protek. Browse everything in Building Materials.

Want a price or a shade or size recommendation? Message us on WhatsApp with a photo and the measurements, and the Lakhiram showroom team on Chakrota Road will reply with price, stock and Dehradun delivery time.