Hip roof ceiling joist
Hip roof ceiling joist
(OP)
I am designing a workshop (18x25) with a 4:12 hip roof. My question is what should I use for ceiling joists since the shortest span would be 18', and 2x(southern pine No.2) framing lumber only goes up to 16' in the big-box home improvement stores. Also, looking at span tables (for southern pine), I would need to use MEL (machine evaluated lumber)or MSR (machine stress rated) lumber for that kind of span. Are these specially rated lumber readily available? Or can I double-up some No.2 2x to make a 4x joists that's 18 feet long? Thanks!





RE: Hip roof ceiling joist
Trus Joist is a major LVL and PSL manufacturer and has some information in this pdf file. Engineered lumber is pretty expensive so we usually try to double or triple joists first, depending on the cost and whether it works.
http://www.trusjoist.com/PDFFiles/2015.pdf
RE: Hip roof ceiling joist
******* (external wall, 18'wide)
| | | | (joists, 12.5' long)
+++++++ (LVL beam, 18' wide)
| | | | (joist, 12.5' long)
******* (the other external wall, 18' wide)
RE: Hip roof ceiling joist
RE: Hip roof ceiling joist
In our area dimensioned lumber is available up to 24'
Look at a span table ie 2x10 @ 16" SPF can span 19'10"
ceiling joist with limited storage LL=20 psf
RE: Hip roof ceiling joist
RE: Hip roof ceiling joist