Flat & Low-Slope Roof Coating
A roof coating is only as good as its thickness. Rubberseal builds a true, seamless membrane — about 40 mils, roughly 32 sq ft per gallon — not a paint-thin promise. It rolls on cold and cures into one flexible, waterproof skin with no seams to fail.
Why thickness beats price-per-gallon
Cheap “roof coatings” win on the shelf by going on thin. But a flat or low-slope roof lives under standing water, ponding, and constant sun — and a thin film cracks and lets water through. Rubberseal is a membrane, built up in multiple coats to a real film thickness, so it bridges cracks and moves with the roof instead of failing at the first hard rain. Compare coverage at thickness, not price per gallon.
Which color for your roof
- White — reflects sunlight and keeps the surface cooler in the sun. The popular choice for exposed flat roofs.
- Gray — the same membrane in a clean, neutral finish that hides everyday dirt.
- Black — our strongest, true-waterproofing membrane. Where water genuinely stands or ponds, step up to Black.
How to build the membrane
Clean and prepare the roof, repair any structural issues, then apply Rubberseal in multiple coats with a 3/8-inch nap roller between 50–95 °F, letting each coat dry before the next. Reinforce seams, flashings, and penetrations with Rubberseal Geotextile fabric embedded between coats. Build to a continuous, void-free film. Don’t apply if rain is expected within about 6 hours.
Coverage: about 32 sq ft per gallon at 40 mils (thinner protective coats go further). Estimate your roof with the coverage calculator.
Common questions
Does it handle ponding water?
For areas where water truly stands, use Rubberseal Black — it’s built for continuous water contact. White and Gray shrug off rain and temporary standing water.
How many coats?
Multiple coats to a full membrane build; reinforce seams and details with geotextile fabric between coats.
Questions? Talk to technical support at 866-607-6826.