Brick Linder
9/21/2005
I am installing a standing seam metal roof on a new building w/8:12 pitch and 2x12 rafters @ 16" OC. Do you recommend the metal be installed on furring strips running perpendicular to the rafters or on 5/8" OSB sheathing over the entire roof? If furring strips, what spacing? If sheathing, should ice and water shield or Tyvek or nothing be placed between the sheathing and roof panels? Thanks for the help.
Brick Linder
9/22/2005
Can anyone provide any help with this one? thanks
Allan Reid
Dura-Loc Roofing Systems, Inc.
9/22/2005
There are many considerations as follows. There are separate codes for residential and commercial and heated vs non heated. First you should check with the manufacturer to see what they recommend for application as it could effect the warranty and wind performance etc. Certainly the structure needs to be braced properly for wind load and plywood serves this fubction well. If you use open framing then ensure it is blocked and braced to code. If you are intending to insulate between the rafters and create a vaulted ceiling, then you must ventilate. The code requires a minimum of 1" vertical vented free air space over the insulation. In that case I would suggest using a 7/16" sheathing to brace the structure, then the underlayment, strap vertically over the rafters for the air space and then horizontal to accept the roofing.
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