Wednesday, December 14, 2011

Spray Foam Adhesives Strengthen Your Building’s Roof (Part 2)

Also see Part 1 of this blog series

In a test conducted by Clemson University’s Civil Engineering Department in 1998, it was demonstrated that roofs with SPF adhesive like the ones made by Conklin can withstand 2 to 3.5 times more uplift resistance than roofs held together with nails alone. In one test sequence using 5/8 nailed OSB, the roof system had an uplift resistance of 87 pounds per square foot. The addition of SPF adhesive increased the uplift resistance to 314 pounds per square foot.

To prevent water intrusion, the spray foam is also applied across all the sheathing seams. When roof sheathing is installed, there is often a small gap left between the sheathing panels, often as large as 1/8 to 1/4 inch wide. This small space can allow water to enter the home if the external roof shingles or tiles are compromised. The external roof shingles or tiles are typically the first part of a roof system to fail in hurricane-force winds. With the spray foam protecting these gaps as a secondary barrier, water cannot penetrate the roof if the shingles are blown away.

In a recent interview with Jason Hoerter, Sr. Product Manager and building science engineer with NCFI Polyurethanes, we learned about NCFI’s focus on this market sector and the company’s recent accomplishments with third party qualified testing and Florida Product Approvals for their InsulStar® product line.

Hoerter mentions, ”The 2007 University of Florida tests were substantial in their ability to prove concept for spray foam as a wind destruction mitigation product solution. But the bar has been raised significantly higher now that we have actual third party qualified test results and a Product Approval from the state of Florida for InsulStar® spray foam.”

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