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purlin
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# Posted: 21 Sep 2011 04:25pm
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I have a few questions about a camp I am building. Can readers please share your wisdom?
The roof span from wall to ridge is going to be 18 feet
The roof is going to consist of the following: tongue and groove boards(3/4"), 2 layers of 2" rigid insulation, 2x4's flat, 5/8 advantec, winterguard roof underlayment and certainteed shingles. Does this sound ok?
The round spruce log purlins will be no less than 8" in diameter and will not span more than 12 ' from gable to gable (a wall and a king truss will break it up)
The roof pitch is 9/12
How many purlins do I need between the wall and the ridge? I've looked in several places on the internet and have been unable to find any tables or advice that can give me a sure answer. Can you tell me?
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Malamute
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# Posted: 21 Sep 2011 09:56pm
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I don't have any formulas, but the fact that you aren't using real rafters over the purlins will have some bearing on the span. A seat of the pants idea would be two per side. If you were going to rafter it, one would likely be fine.
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purlin
Member
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# Posted: 22 Sep 2011 07:48am
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Thanks for your help.I was trying to decide between 3 or 4.
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