How To Apply Elastomeric Roof Coating

Elastomeric roof coatings are easy-to-apply and can protect and beauty. Bright white coatings can also help save energy by reflecting harmful UV and solar rays.

What You May Need (as highlighted in the video)

• Pressure Washer
• Broom
• Industrial Paint Brush or Roller (roller recommended for larger surfaces)
• Fiberglass or Fiberglass Mesh
• Elastomeric Roof Coating (the video highlights an acrylic water-based roof coating)
• Cooperative Weather
• Note: bright white roof coatings can be highly reflective and protective eyewear is recommended. Also, coated surfaces can become slippery. Always use caution and all safety best practices.
  

Proper surface preparation and application technique are critical for achieving a long-lasting elastomeric roof coating that can extend your roof's life by 10-20 years.

Step 1: Clean and Remove All Surface Contaminants

Time Required: 2-4 hours

Thoroughly pressure wash the entire roof surface to remove:

• Dirt, debris, and loose materials
• Chalking from old coatings
• Biological growth (moss, algae, mildew)
• Grease and chemical residues

Use a TSP (trisodium phosphate) solution for stubborn contaminants. Sweep away any remaining debris after washing.

Step 2: Allow Surface to Completely Dry

Drying Time: 1-4 hours (weather dependent)

• Check moisture content with a moisture meter (should be below 15%)
• Ensure no standing water remains in low spots
• Best conditions: sunny day with low humidity
• Never apply coating over dew, frost, or damp surfaces

Step 3: Repair Cracks and Damaged Areas

Critical for Preventing Future Leaks

• Fill cracks wider than 1/16" with elastomeric patching compound
• Apply self-adhering seam tape to all joints and penetrations
• Reinforce problem areas with fiberglass mesh embedded in coating (or entire area as needed)
• Allow repairs to cure completely before proceeding

Step 4: Apply First Coat of Elastomeric Coating

Coverage: 100-200 square feet per gallon

• Cut in edges with a 4-inch brush around perimeter and obstacles
• Roll main surface with 3/4" nap roller or spray application
• Apply evenly to achieve 10-12 dry mils thickness
• Work systematically to maintain a wet edge

Step 5: Cure Time Between Coats

Drying Period: 24-48 hours

• Ideal conditions (70°F, low humidity): 24 hours minimum (depending again on the type of coating)
• Cool or humid weather: Wait full 48 hours
• Surface must be fully cured, not just dry to touch
• Check for uniform color before applying next coat

Step 6: Apply Second Coat Perpendicular to First

Final Protection Layer

Apply the second coat at right angles to the first coat direction:

• If first coat was applied north-to-south, apply second coat east-to-west
• This crosshatch pattern ensures complete coverage
• Target same thickness as first coat (10-12 dry mils)
• Total system thickness should reach 20+ dry mils

Pro Tips for Best Results

Weather Window: Ensure no rain for 48 hours after final coat Temperature Range: Apply between 50°F and 85°F Coverage Rate: Don't stretch the product - follow manufacturer's specified coverage Quality Check: Use a mil gauge to verify proper thickness Third Coat Option: Consider for flat roofs or extreme weather exposure

Expected Performance

• Properly Applied System: 10-20 year service life
• Energy Savings: 15-30% reduction in cooling costs
• Warranty: Document application with photos for manufacturer warranty
• Maintenance: Annual inspection and cleaning extends coating life