In a Pakistani summer, your roof is the main reason your rooms stay hot. A bare concrete roof absorbs sunlight all day and releases that heat into the rooms below, long after sunset. Air-conditioners then run harder, longer, and cost more — fighting heat that comes from above.
How Heat Proofing Works
Heat proofing is simple physics: a bright, reflective surface sends sunlight back instead of absorbing it. Water Seal’s white PU coating reflects up to 85% of sunlight. The roof surface stays far cooler, less heat passes into the rooms, and indoor temperature typically drops by 6–8°C. The same coating is also 100% waterproof, so one treatment solves both summer heat and monsoon leakage.
What Affects the Result
- Roof colour: white and light finishes reflect the most heat. Dark surfaces — especially black bitumen — do the opposite.
- Existing insulation: homes with no roof insulation feel the biggest improvement.
- Clean surface: dust dulls any light surface over time. The coating is washable, and a periodic wash restores its reflective finish.
- Full coverage: patchy or half-done coating leaves hot spots. The whole roof must be coated evenly.
Heat Proofing vs Air-Conditioning
Air-conditioning cools the air inside; heat proofing stops the heat from entering in the first place. They work best together — with a coated roof, your AC cools faster, runs less, and uses less electricity. Many homeowners find their cooling bills drop noticeably in the first summer after coating.
What It Costs
Water Seal roof heat proofing with PU coating starts from Rs 70 per sq. ft. The exact quote depends on roof size and condition, confirmed after a free site inspection and joint measurement. Every full-roof treatment includes a written 5-year warranty.
Frequently Asked Questions
Will heat proofing alone stop leakage too?
Yes, when done with the PU system — the same coating is both heat-reflective and waterproof. A coating that only reflects heat but does not seal cracks will not stop leaks.
How long does the cooling effect last?
As long as the coating is intact and reasonably clean. Washing the roof surface from time to time keeps the reflective finish working at its best.
Get a Free Roof Inspection & Heat Proofing Plan
WhatsApp: 0302 9867007 | Website: waterseal.com.pk