Gable end and eaves

KEVIN DUPKE
3/13/2015
Planing a new construction with corrugated metal roof with through fasteners on a steel frame with roof trusses at 4 feet apart with metal purlins 2 feet apart. No decking. 4:12 pitch. Closed cell spray foam directly to interior roof panels. Specifically, though, are there any recommendations to enforcing the eaves especially at the gable ends? Please note this will be located in hurricane country. Thanks.
Todd Miller
Isaiah Industries, Inc.
3/13/2015
So you want to ensure extra wind resistance on the perimeter? One option would be to decrease the spacing of the fasteners.
KEVIN DUPKE
3/14/2015
Todd. Yes, would like to maximum wind resistance of the roof. More fasteners for certain. To that point, manufacturers provide a fastner pattern but I assume there shouldn't be any issue with adding more. Further, any there any tips/pointers that would be helpful about securing the eaves and gable ends? Any particular type of rakes? Any other modifications? The RICOWI study showed with Katrina eaves are the weak spot for the roofing system. Personally, we are possibly over engineering since it's Hurricane1, US 0 since we lost a house already to a hurricane.
Todd Miller
Isaiah Industries, Inc.
3/14/2015
Thanks Kevin. Generally speaking, exposed fastener metal roofs do very well in wind events, including the edge perimeter. It;s a little hard for me to get too specific without knowing exactly what panel you'll be installing. Also, I would suggest that once you get to that point, contacting the manufacturer for greater information is helpful. Generally speaking, I would suggest an eave starter that the ends of the panels are actually folded and locked over. On the gables, I would suggest staying fairly low profile to help avoid wind issues. I hope this helps.

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