Short-Term Fastening in FRP vs. Permanent Fastening in Steel & GreenGirt® CMH™
FRP vs. 16-Gauge Steel vs. GreenGirt Composite Metal Hybrid (CMH)
ASTM D7332-B | 7-Day Fastener Pull-Out Resistance Test
Don’t be misled — Fiber-Reinforced Polymer (FRP) differs from steel in that it will exhibit Screw-Creep. Screws directly attached into FRP will lose capacity over a combination of time, force, and heat. It’s a known Power Law phenomenon. Given the elevated temperatures found inside wall cavities, it is necessary to conduct tests involving time, force, and heat to ascertain its durability and true capabilities. Employing the ASTM D7332-B test at the high service temperature of a building envelope over a duration of seven days allows for a better determination of an FRP product’s ultimate usable fastener retention value. This procedure establishes a practical baseline for a product’s fastener retention performance in FRP-based products.