Investigation of Spray-Applied Polyurethane Foam Roofing Systems - I.
Technical note Jan 73-Jun 76,
CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CALIF
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An experimental investigation of the performance and properties of spray-applied polyurethane foam roofing systems is described. Polyurethane foam studied included densities of 2.0 and 2.5 pcf. Elastomeric coating systems included catalyzed silicone, moisture-curing silicone, butyl-hypalon, neoprene-hypalon, hypalon, butyl, chlorinated rubber, catalyzed urethane, moisture-curing urethane, and an acrylic emulsion. In addition, a fibrated aluminum-asphalt was included. Properties of the coating systems such as adhesion, tensile strength, elongation, impact, and wind-driven-rain absorption are also reported. Experimental roofing panels were located at a seashore site, a desert site, and a cold weather site. After exposure periods of up to two years, performance of the silicones and the catalyzed urethane was rated as excellent at all three sites. Rankings based on the laboratory tests showed a catalyzed urethane as first, followed by the silicones and a neoprene-hypalon. Adhesion characteristics of coatings applied to foam which had been allowed to degrade for periods up to 9 days prior to coating application are also reported. Noticeable loss of adhesion was observed in the panels in which the foam had been allowed to degrade for 3 days or more prior to coating. Author
- Structural Engineering and Building Technology