Wind Resistance

Cedar shakes and shingles offer outstanding hurricane-force wind resistance, as proven through UL-1897 uplift resistance testing using parameters for a test model home located in Dade County, Florida, the highest U.S. standard for wind resistance requirements. These test results are applicable to CSSB member product only:

• Shakes and shingles have been subjected to the UL 1897 fourth edition "Uplift tests for roof covering systems" with exemplary results. The classification for uplift resistance is expressed in pounds per square foot. The test method subjects a minimum 10 by 10 ft. test sample to various short term (1 minute interval) static pressures which represent the uplift forces imposed on roofing systems securement to a specified roof deck when exposed to high velocity winds. In other words, it tests how well shakes and shingles hold up when subjected to high winds. It measures the degree to which the roofing material is uplifted from the roof deck.

A subsequent report by a Florida Registered Professional Engineer converted the PSF numbers into miles per hour using the analytical method for wind design of roof cladding set forth in Section 6 of ASCE 7-98 (American Society of Engineers).

It should be noted that these calculations were conducted for a specific house in the Dade County area of Florida. When converting from PSF to MPH using ASCE 7-98, results will vary depending on many factors including building height, location, roof slope, environment, etc. Be advised that all design parameters, assumptions and limitations of use set forth in the Florida engineer's report are necessary components of further interpretation. These test results exceed Dade County, Florida wind resistance requirements testing protocol PA 100-95. CSSB member products are accepted by Dade County, Florida as an accepted roofing material.

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