standing seam over purlins

hawaiidiy

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)?

tinner666

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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Frank

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bronco2

Morning Tinner, why is an underlayment not neccesary if vapor barrier is done correctly inside?

tinner666

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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Frank

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johnk

Cause he said so!!!LOL.Tinner don't need no stinkin' underlayment!!

hawaiidiy

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?