Accession Number:

ADA229172

Title:

Investigation of Spray-Applied Polyurethane Foam Roofing Systems-II

Descriptive Note:

Final rept. Jul 1976-Jan 1986

Corporate Author:

NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA

Report Date:

1990-09-01

Pagination or Media Count:

99.0

Abstract:

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, 2.5, and 3.0 pcf. Elastomeric coating systems included catalyzed silicones, moisture-curing silicones, moisture-curing silicones, a water-based silicone, butyl-hypalons, hypalons, acrylics, neoprene- hypalon, butyls, chlorinated rubber, fibrated aluminum-asphalt, catalyzed urethanes, moisture-curing urethanes, urethane-hypalons, neoprene asphalt- acrylic emulsion, rapid-cure urethanes. A rigid cementitious coating system was also included. Properties of the coating system such as adhesion, tensile strength, wind-driven-rain absorption, impact strength and elongation are also reported. After exposure periods up to almost 12 years, eleven of the 54 coating systems were rated excellent or very good at all three of the exposure sites - seashore, desert, and mountain. They included catalyzed silicone with granules, moisture-curing silicone with granules, two acrylic emulsions, three acrylic emulsions with granules, two catalyzed urethanes, one moisture-curing urethane with granules, and a urethane-silicone. Effects of foam density and relative importance of physical properties on coating system performance are also reported. Degradation of uncoated foam is also reported. Glass transition temperature tests by the impact and DSC methods performed by USBR on contract are also reported.

Subject Categories:

  • Plastics
  • Structural Engineering and Building Technology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE