Key Points
- Coatings are maintenance products -- they cannot fix active leaks
- Repair all failures before coating any roofing surface
- Silicone coatings offer the best ponding water resistance
- Best value on metal or SPF roofs with intact membranes approaching UV wear
- Cost: $1-$6/sq ft professionally applied depending on product type
Frequently Asked Questions
What types of roof coatings are available?
Main roof coating categories: elastomeric acrylic coatings (water-based, most common, decent UV protection, suitable for metal and some single-ply); silicone coatings (best UV and ponding water resistance, excellent for flat roofs, higher cost); aluminum coatings (reflective, good for metal roofs, limited waterproofing benefit); and polyurethane coatings (very durable, for high-traffic roofs). Each type has specific surface compatibility requirements.
Can roof coating fix a leaking roof?
No -- roof coatings are maintenance products, not repair products. Coating over a leaking roof traps moisture in the roofing system, accelerates deterioration, and does not stop the leak. Before applying any coating, all active leaks must be repaired. Coatings extend the life of an intact roof by protecting it from UV, heat, and water -- they do not substitute for addressing failed seams or damaged areas.
How much does roof coating cost?
Professional roof coating application typically costs $1-$3 per square foot for standard products, or $3-$6 per square foot for premium silicone or polyurethane coatings. For a 2,000 square foot commercial flat roof, this ranges from $2,000-$12,000 depending on product. DIY coating of a small accessible flat section is possible with products available at roofing supply houses, but professional application ensures proper coverage rate and surface preparation.