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Roofing and Siding since 1985
Sat, May 16 2026, 8:42am [ Login ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, [3] ]
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Date Posted: Tue, Sep 03 2002, 2:03pm
Author: A Roofer
Subject: Re: wood roof joist and rafters
In reply to: dave 's message, "wood roof joist and rafters" on Sat, Aug 31 2002, 2:02pm

I want to make sure I understand this right. You have two walls built on this 20x30 building and on one side the wall stands 11' tall and on the other it stands 7'6" tall and I suppose these walls are 20' apart thus creating the 2/12 pitch.

Take into consideration that 20' is an awfully long way to free span that weight. If a 2x4 was to try to span that distance all by it self it would sag under its own weight over time. I have always built thing pretty stout myself when I build things so I would probably span that great of a distance with 2x12s (no less then 2x10s) on 16" centers. I would also probably knock a 2" bird mouth out of the 2x12s where they set on the walls.

A Roofer

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