Hi,
Just browsing through some old FHB and read an article from 2000. Installing a metal roof. It mentioned about OSB not having the holding power of ply for the screws. Is that still the case?
Mikey
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Don't know about the holding power but if it's a roof that can rust (tin) you might want to go with 1X6's with 1.5" spacing so the underside can breath.
Runnerguy
That is true.
Re second post - 29ga metal would require solid sheathing supporting it, with tarpaper backup.
1x6 only provides 3/4" air spacing, not 1-1/2" so maybe I misunderstood something
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i thought of another point - the standard screws provided for screw-down metal roofs has a 1/4" head on a #8 or #10 shank
I always used the 5/16" head x #12 shank. This was to prevent them snapping off, but the greater amt of wod displaced by the larger screw and the more friction of more thread spiraled into the wood means more holding power, so you should use these larger screws if you chose to sheathe with osb
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