*
A coworker ask me if it would be safe for him to use a garage attic for storage. The garage is 24 feet wide with a stick framed roof. The joist are 2×8-24 on 2 foot centers. No center beam beneath the joist, but does have collar ties on every other 2×6 rafter. No other bracing. he has already put a 3/4 inc OSB floor in, but after handling that much weight he is having second thoughts about loading.
My instincts say no, or very little loading with that span, but my span tables are in storage at the moment. He did not say what the joist lumber spieces is.
All disclaimers are noted. I have already suggested an engineer.
Dave
Replies
*
24 foot 2x8 will barely support themselves...
in the 30 lb. table even 2x12 will not support 30 LB. over 19 feet...
*Mike's right, it barely supports the osb. Where did the builder find 24 ft 2X8s these days? Only way to make this work is to convert the rafters and joists into a truss - have to take up the osb to tie into the joists. Get a sample truss and copy it if its your own house (every joist/rafter, assuming rafters and joist run the same direction and are on the same spacing if not forget it and just remove the osb), lots of work but only way to put stuff up there, and then relatively cramped with the truss elements in place. Read about someone who cut away all the truss elements of a truss roof to get more room and had the roof on the car at the first heavy snow.
*Thanks Mike and Art. My instincts were right then. Apparrently the garage was built by a previous owner a number of years ago. I thought of the truss configuration also, but did not tell the man. He is a crane operator and his brother is mechanic. They probably won't listen anyway, but before I told them no 100%, I thought I should ask. At least I'm not doing this one, so It won't be me in court when it caves in.If I ever get my shop finished I'll get all my referance books out of that mini storage facility. Untill then I just try to avoid talking about or doing anything that I can't look up. Of course the four boxes of books are in the back with all that other stuff on top of them.Thanks again, Dave
*If they were 2X8 SPF #2 spanning 24ft, they could only hold a 5# psf ceiling load.
*Well, looking at my span book, it says the following:Floor joists, nailed and glued subfloor thickness of 3/4, with bridging, with ceilings attached to wood furring, for spruce-pine-fir, grade 1 and 2, on 24 inch spacing, 10 ft 9 in is the maximum span. This is from the Canadian Wood Council Span Book. I would have second thoughts too! BTW I agree on the 2x8-24's, they must have cost a bundle.
*A truss system here does'nt help, you need this for storage . So the only way is a midspan support with posts and footings.
*
A coworker ask me if it would be safe for him to use a garage attic for storage. The garage is 24 feet wide with a stick framed roof. The joist are 2x8-24 on 2 foot centers. No center beam beneath the joist, but does have collar ties on every other 2x6 rafter. No other bracing. he has already put a 3/4 inc OSB floor in, but after handling that much weight he is having second thoughts about loading.
My instincts say no, or very little loading with that span, but my span tables are in storage at the moment. He did not say what the joist lumber spieces is.
All disclaimers are noted. I have already suggested an engineer.
Dave