Roof Coatings, Liquid Roofing, and Spray Polyurethane Foam Projects
Coatings: Acrylic, Silicone, Urethane, SEBS, & Aluminized Asphalt Emulsions:
Roof coatings are primarily used to either extend the life-cycle; or, as an economical attempt to get some more years out of a failed roof system. Coating failed roof systems does not work very well on low-sloped membranes or steeper shingle type systems. To be economically effective on a ROI basis, permanent type repairs must be made first, sometimes aged a little, then coated with base material with embedded reinforcement where appropriate to the area being coated, and then finish coat.
Liquid Roof Membranes: Polyurea, Polymethyl Methacrylate (PMMA), EPDM Polymer/Asphalt Emulsion (Liquid Rubber), Two-part Urethane:
Our experience is limited with liquid roof systems. We have tried it on test areas to see how it performs. Liquid roofing is often used as a waterproofing membrane below plaza or vegetated roof systems. Many of our continuing education sessions have been case studies of expensive liquid membrane failures and some others outlining correct installation methods. We do keep product information and performance data in our roofing library in case we are called upon to make recommendations or provide specifications for a project where there Liquid Roof or W.P. would have ROI advantages for our clients.
Spray Polyurethane Foam (SPF):
ConSpecT has performed roof assessments and forensic investigations on numerous Spray Polyurethane Foam Projects and have specified, then QAO monitored, a few others on our client’s roofs (see below) and in walls; (see photo in Projects - Walls & Building Envelope).
Measuring coating thickness of a finish coat application with a notched wet mil thickness card to verify that contractor is meeting our spec.
Recoating part of a ponded area first applied in 2001 (on the roof, not the swamp beyond the roof : -)
Close up of SPF over conc. Federal Tile, now over 6 years old, no problems.
Right side of photo, SPF over circa 50 year old built-up roof, Left side over conc. Federal Tile. Both sectors are now 6 years old, no problems.
Contact ConSpecT if you are contemplating roof Coatings, Liquid Roofing, or Spray Polyurethane Foam Projects because we keep up on what works and what doesn’t.