A friend has my code book, so I’m hoping one of you encycleopedic minds can help out.
I’m building a simple shed roof to store our camper under. Rafters are 16″ OC, #2 SPF lumber, snow load is 80 lbs per sq. ft. Span is 10 ft. What size? I’m prepared to use 2×8 but would rather use 2×6.
Thanks,
Scott.
Edited 8/10/2009 11:58 am by Scott
Replies
without even looking it up, I an say forget the 2x6
spancalc only goes up to 60# and lets you span 8'2"
http://www.cwc.ca/cwc/Template/SpanCalc.aspx?NRMODE=Published&NRORIGINALURL=%2fResources%2fE-Tools%2fSpanCalc%2ehtm&NRNODEGUID=%7b41B9325F-527F-42E7-9D91-3BCD0359AA93%7d&NRCACHEHINT=Guest
My instinct and experience says that for 80# you are looking at 2x10 or going to a 12" layout
Welcome to the
Taunton University of Knowledge FHB Campus at Breaktime.
where ...
Excellence is its own reward!
http://www.awc.org/calculators/span/calc/timbercalcstyle.asp?species=Hem-Fir&size=2x8grade=No.+2&member=Floor+Joists&deflectionlimit=L%2F360&spacing=16&wet=Yesincised=No&liveload=80&snowload=-1&deadload=10&submit=Calculate+Maximum+Horizontal+Span
Here is another version of span calc thaat gets us more loading info
I was right
Welcome to the
Taunton University of Knowledge FHB Campus at Breaktime.
where ...
Excellence is its own reward!
Cool, thanks. I didn't know about the online calculators.Looks like I can use 2X8 if #1SPF, 2X10 if #2.Scott.
>> Span is 10 ft. << Are you saying the building is 20' wide or 10' wide?
10'. It's a shed, there's no ridge.