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Old 11-20-2009, 01:17 AM   #1
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standing seam over purlins


I live in Hawaii and want to re-roof. I currently have cedar shakes over 1x4 purlins spaced every 12". I want to install a standing seam metal roof. I plan on removing all of the old cedar shakes and felt. my question is, should I put solid decking on top of the purlins and then an underlayment (sharkskin), or can I just put the sharkskin on top of the purlins and then the standing seam and save the cost of the decking (OSB)?

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Old 11-20-2009, 06:14 AM   #2
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standing seam over purlins


Just install the roof over the purlins. Underlay shouldn't be necessary if done correctly, and the ceiling/attic area is sealed from indoor condensation.
http://www.albertsroofing.com/Tin%20...to_gallery.htm

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Old 11-20-2009, 06:30 AM   #3
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standing seam over purlins


Morning Tinner, why is an underlayment not neccesary if vapor barrier is done correctly inside?
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Old 11-20-2009, 06:41 AM   #4
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standing seam over purlins


If moisture hits the underside of the metal, and the temp difference is a certain ratio, it will rain inside the home on a clear day.
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Old 11-20-2009, 09:21 PM   #5
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standing seam over purlins


Quote:
Originally Posted by bronco2 View Post
Morning Tinner, why is an underlayment not neccesary if vapor barrier is done correctly inside?
Cause he said so!!!LOL.Tinner don't need no stinkin' underlayment!!
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Old 11-21-2009, 08:00 PM   #6
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standing seam over purlins


Thanks for the reply. I think I will install decking first and then underlayment. More labor and more material cost, but a much better roof, don't you think?

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