Silicone Roof Coating Over Modified Bitumen on a Denver Office Building
Project Overview
- Location: Central Denver, CO
- Building Type: Commercial brick office building
- Size: 2,000 sq ft
- Roofing System: ASC high-solids silicone liquid membrane, 43 mils, over existing modified bitumen
- Duration: 6 working days
- Completed: October 2024
- Manufacturer: American Standard Coatings (ASC)
- Warranty: 10-year manufacturer warranty
Roof Condition
The existing modified bitumen roof on this central Denver office building was weathered and its surface was worn, with problem spots around skylights, rooftop units and penetrations. The membrane underneath was still serviceable, which made it a candidate for restoration instead of replacement.
- Weathered modified bitumen roof
- Worn roof surface
- Problem spots around skylights, rooftop units and penetrations
Evaluation & Approach
A tear-off on a tight urban site means dumpsters, noise and an open roof over working offices. Silicone restoration kept the building dry and occupied during the work. The coating is seamless, so the old laps and flashing joints are covered by one continuous membrane. Silicone holds up to ponding water and Colorado sun, and the bright white surface lowers roof temperature in summer.
Why This Approach
- The membrane underneath was still serviceable, which made the roof a candidate for restoration
- Silicone restoration kept the building dry and occupied during the work
- The coating is seamless, so the old laps and flashing joints are covered by one continuous membrane
- Silicone holds up to ponding water and Colorado sun
- The bright white surface lowers roof temperature in summer
- No tear-off, with a 10-year manufacturer warranty
Scope of Work
- Clean and Prep: Cleaned and prepared the existing roof.
- Repairs: Repaired damaged areas.
- Detail Work: Detailed around skylights, equipment curbs and penetrations before coating.
- Silicone Membrane: Installed ASC high-solids silicone liquid membrane at 43 mils over the entire modified bitumen roof, including the parapet walls and curbs.
Result
Warranty: 10-year manufacturer warranty
- Seamless White Roof: A seamless white silicone roof over the whole building
- No Tear-Off: Finished without removing the existing roof
- Building Stayed Occupied: Silicone restoration kept the building dry and occupied during the work
- 10-Year Warranty: The restored roof carries a 10-year manufacturer warranty