Roof coatings are often marketed as an easy alternative to replacement. In reality, a coating is a system upgrade that works best on roofs that are still structurally sound—but need added UV protection and waterproofing reinforcement.
This guide compares silicone and acrylic coatings for flat/low-slope roofs and explains when coating is the right move (and when it’s not).
When a roof coating makes sense
- The roof membrane is generally intact (no widespread saturation or structural damage).
- Leaks are localized and can be repaired before coating.
- You want to extend service life and improve reflectivity.
When coating is a bad idea
- There is extensive trapped moisture in insulation or decking.
- Drainage is poor and ponding is severe without design fixes.
- There are many failing details (penetrations, curbs) that need rebuilding first.
Silicone coatings: strengths and tradeoffs
- Strength: handles ponding water better than many alternatives.
- Strength: strong UV resistance.
- Tradeoff: can attract dirt over time; surface prep and thickness matter.
Acrylic coatings: strengths and tradeoffs
- Strength: often cost-effective and highly reflective.
- Strength: performs well with good drainage and proper maintenance.
- Tradeoff: generally not ideal for persistent ponding water conditions.
The coating process that determines success
- Inspection: identify wet areas, seam issues, and failing penetrations.
- Repairs: fix seams, flashing, and damaged sections first.
- Cleaning: coatings need a clean, properly prepared surface.
- Application: correct coverage thickness and reinforcement at details.
Want to know if your roof is a coating candidate?
A quick inspection can prevent wasted money on a coating that won’t last. See our flat roof repair & replacement or contact us for an estimate.