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Re: 2 x 6 s ??


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Posted by jdemaris on July 27, 2010 at 18:47:38 from (67.142.130.12):

In Reply to: Re: roof pitch posted by randy1 on July 27, 2010 at 17:28:45:

You've got to be crazy if you're talking about a 14 foot span and only using 2" X 6" rafters. You said 14 feet, but I'm not sure it that's 14 feet of span, of maybe 12 feet on the outside wall and another 2 feet of overhang.

A standard (pine or spruce) 2" X 6" can span 10 feet at most for a moderate snow load (30 psf), and that's when spaced on 16" centers. If 24" it's only good for 9 feet of span in light-snow areas.

In my area of central New York, a roof must be rated at 60 psf snow-load. A 14 foot span requires 2" X 12" rafters if spaced on 24" centers and 2" X 10" rafters if on 16" centers. Further north in the Adirondacks, an 80 psf is required.

Pitch has nothing to do with any of that. Pitch determines how many leaks you're going to have - or - how much snow will build up without shedding itself clean. Also if the roof is too flat, many types of roofing, including steel, will leak. I wouldn't build anything with less then a 3/12 pitch, and only then if someone is going to be around to shovel snow off of it. 3/12 pitch on a 14 foot span, starting at 12 feet high, is going to be 8 1/2 feet at the low side. With that 3/12 pitch, you can use steel roofing if you do it right. Any flatter and you're going to have leaks.


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