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Re: Underlayment for metal roof [Re: Don P] #21695 11/06/09 02:16 AM
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Don,
Thanks a bunch, lots of good help here. I think I have decided to add more purlins and have a 2' span instead of 4'. Whether I need that much or not.......I'll feel better working under it.

Thanks to everyone for all your help.

Re: Underlayment for metal roof [Re: Rookie] #22162 01/01/10 06:56 PM
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Pete Ladd Offline
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One other thought. A layer of 30# felt will prevent nailheads in the roof boards from contacting the underside of the metal roofing, and forestall any damage or corrosion to the paint coating.

Personally I'm comfortable with rough sawn I"x boards on about a 36" purlin spacing, for metal roofing here in NH. Especially if the roof has 1x4 strapped horizontally for screwing the metal to, and ventilation. I always want a water shield (felt etc) underneath due to condensation etc. Closer purlin spacing is going to look awfully 'busy" or heavy, aesthetically.


Re: Underlayment for metal roof [Re: Pete Ladd] #22163 01/01/10 10:35 PM
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TIMBEAL Offline
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Once I reach the 2' spacing I am using 2x stock.

I just cut a bunch of step lapped rafter pockets at 4' spacing. It took me 2.5 songs on the radio for each pocket. I don't know yet if I am boarding or just strapping and using heavy shakes. 6x6 rafters or there about depending on what I find or logs.

Tim

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