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Old 02-06-17, 01:42 PM   #1
Helper EcoRenovator
Join Date: Mar 2011
Location: Roswell NM
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Default Purlins?

The roof on my front porch finally gave up the ghost.
After watching the leaks get progressively worse over the years I decided to fix it. Of course in my nativity I thought, just cut out the rotted sections and re-shingle, no problem.
You guessed it, the rot was so bad that I stripped off all the roofing including the pseudo repairs that previous owners had attempted, about 40 pounds of galvanized metal and the same weight in tar sealant.
Having weighted up the cost I decided to replace it all with ribbed, not corrugated metal, now the question.
After taking off the plywood/OSB mixture that was the existing substrate I'm left with the 3/4" high gap where the sheeting used to be, to tuck the new metal under the house shingles. With only a 3/4" vertical gap and the metal roofing ribs being the same height I have no room to add the extra height of a purlin, so can the metal be attached directly to the 2X4 rafters. The 2X4's are on 16" centers and 8' in length, and I intend to cross brace every 24" or so but don't intend to walk on the roof.

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