Sizing wood beam members for flooring system?
Question:1) the span is 12ft at 8" o.c.
2) the span is 17ft at 12"o.c.
What are the minimum sizes of wood beam members, total load is 50lb/sf. please provide multiple choices, and/or oftions
Answers:
12' at 8'' OC seems a bit close unless you are planning to put some serious weight on them. I would use 2 x 10 douglas fir, as for your 17' span, I dont think I would go as far as to use a 2 x 12, I think that would cost you a fortune and use alot of space. I would look at engineered floor joists for that. The cut them to any length and engineer them for any span with LVLs, your local lumber yard should be able to engineer it on their computers.
I assume that you mean wood floor joists. A 12' span at 8: OC would typically be a 2X10" spruce joist in my area. A 17 foot span at 12" OC would typically be a 2X12" or a 12" I joist. Check with a lumber yard in your area.
With 12"OC, you can go with 2x10 with 17' span. But you need to confirm species of wood. This calculator doesn't go down to 8"OC.
http://www.awc.org/calculators/span/calc...
But I don't know why you would space them so close for the 12' span. You could go 16" oc, and stick with 2x10. But play with the calculator to get other options, but I bet the best option is to go 2x10 12"oc for the 17' span and 2x10 16" oc for the 12' span. If you go with smaller lumber for the 12' span then you have different heights, so you to have shim the height up, and the little bit of savings isn't worth the extra labor.
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