Roof paint calculator
Roof coatings cover ~290 sq ft/gal on traditional roofs (asphalt, modified bitumen, concrete) and up to 500 sq ft/gal on smooth metal. Two coats are required — the first soaks in, the second forms the waterproof film. Best for low-slope and flat roofs.
Estimates round up to the nearest quart and are based on Kompozit's published coverage. Buy slightly more for touch-ups and color changes.
When roof paint is the right answer
Acrylic roof coatings like UNIROOF make sense on low-slope and flat roofs to seal seams, extend service life, and reflect heat. Not the right product for steep shingle roofs (those need replacement, not coating) or for fixing structural damage. A coating buys 5–10 more years on an aging but sound roof.
Pitch factor matters
The roof's actual surface area is larger than the footprint of the building. A 1,500 sq ft building footprint with a 4/12 pitch has roughly 1,725 sq ft of roof surface. The pitch dropdown above applies the right multiplier.
Two coats minimum
The first coat soaks into and seals the substrate. The second is what actually waterproofs. Skipping the second coat means you've spent the gallons but not gained the warranty.
FAQ
3/4-inch nap roller for the first coat (forces material into seams), airless sprayer for the second coat (uniform film). Don't try to spray the first coat on a textured roof — it'll bridge over voids.
No — minimum 24 hours between coats, no rain in the forecast for 48 hours after the second coat. Plan a 4-day weather window with two consecutive dry days for application.