Underlayment Dictated By Tables R301.2(2) And R301.2(3)????

 
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Old 12-15-2015, 11:55 AM   #1
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Underlayment Dictated By Tables R301.2(2) And R301.2(3)????


Hello, has anyone heard of using those tables from the IRC to determine what type of ice/water shield for asphalt shingles? How does the Component and Cladding Load schedule make such a determination?

Asking because a city inspector (who said off course shingles have no negative impact on step flashing and who did not know step flashing has a 4in minimum on sidewall and roof by the IRC) claimed manufacturer instructions for I/W/S trumps all building codes if those instructions contradict the IRC. To me the only time I/W/S comes into play for these tables is 301.2(1) where it gives basically the same standard "freezing problem" bar as other codes.

Link to Tables:

http://publicecodes.cyberregs.com/ic...2_3_par005.htm

Thanks for your insight!

Last edited by Skyvorima; 12-15-2015 at 11:59 AM.
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