Elastomeric Commercial Roof Coatings: Types and Applications

Elastomeric roof coatings encompass several product chemistries, each with distinct properties. Here's a breakdown of the main types and their best applications.

Silicone Coatings

The premium option for commercial roofing. Properties: 90–95% solids, excellent UV resistance (doesn't chalk or harden), flexible across extreme temperature ranges, hydrophobic (water beads off), ponding water resistant. Best for: metal roofs, ponding water areas, high-UV climates, any application where long-term flexibility matters. Cost: $2.50–$5.00/sq ft applied.

Acrylic Coatings

Water-based, lower initial cost. Properties: 55–65% solids (more material lost to evaporation), good UV resistance initially but can chalk over time, may require more frequent recoating in wet climates. Best for: dry climates with adequate drainage, temporary or budget-constrained applications. Not recommended for areas with standing water. Cost: $1.50–$3.50/sq ft applied.

Polyurethane Coatings

Best abrasion resistance. Aromatic polyurethane: excellent durability but UV-sensitive (requires aliphatic topcoat). Aliphatic polyurethane: UV-stable, color-stable, excellent for high foot traffic areas. Best for: roofs requiring high wear resistance, walkway coatings. Cost: $2.00–$4.50/sq ft applied.

The Best Choice for Most Commercial Applications

For most commercial roofing restoration projects, high-solids silicone is the preferred elastomeric coating due to its UV stability, flexibility, ponding water resistance, and long-term performance consistency. The higher upfront cost is offset by superior longevity and fewer recoat cycles.