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The eaves of a home can expose the structure to the ravages of wind-driven rain on two fronts: when soffits are blown out during a storm, and when winds of 90 m.p.h. or greater drive water through vented soffits.
Effective December 2006, the Florida Building Code requires soffit systems to be able to withstand the same design pressures that are applied to windows.
"Securing Soffits" in the Jan/Feb 2007 issue of Coastal Contractor reviews the pilot tests that led to the FBC change and recomends what builders can do to prevent soffit failure and water intrusion in real-world situations.
http://www.coastalcontractor.net/cgi-bin/article.pl?id=131
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