![]() So are these exposed upstairs floor/ceiling joists? I'm a bit confused about wanting an "open feeling" if these are under the main floor. He mentioned putting his Christmas tree there, but otherwise pretty standard living space. I don't think there will be any exceptional live load. The floor will surround that, the max span goes to the rear edge of the chimney, the actual span will be less at that point, so that will help some in the overall picture. The center of the room has a fireplace/chimney that is about 3' thick and about 6' wide. ![]() I had the calculators you mentioned, but like you said, they are geared towards planed 2x material. I don't know if I can get 4x12's cut or not. Using 2圆 T&G for subfloor and hickory flooring, the total flooring thickness will be more than 2". The owner wanted to keep it open feeling, hence the 24" spacing. Subfloor and decking would just provide additional strength and rigidity. Plugged in to the calculator, 4x10 rough 16" oc passes all metrics. But you might be pushing it, especially if you have more live load or any heavy point loads.Īrea = 208"x 16"= 3328 sq in / 144 = 23.1 sq ft so, if your subfloor and decking adds up to 2 or more inches in depth, you should be able to make the span without sagging or bounce. However, a 4x12 rough 24" passes all metrics. Plugged in to the calculator, 4x10 rough 24" oc fails bending and deflection - it will sag and bounce over 17'4" (208") span. ![]() Load = 40 psf + 10 psf = 50 psf (normal design average for living spaces and building materials) Load for 17'4" 24" oc and average design values for stick framed living spacesĪrea = 208"x 24"= 4992 sq in / 144 = 34.6 sq ft Load formula is span x spacing x (live load + dead load) But it would take you the same amount of wood to use 2x10 12 as 4x10 24 if you those 4x10's were ripped in half.Īlrighty - did some engineering math for you using the custom beam calculator, your spacing & spans, and adjusting for repetitive membersįb= 575, I adjusted this by 1.15 for repetitive members to 661 (fiber stress in bending - sagging)Į= 1.0 (modulus of Elasticity - bounciness) but wood is normally stronger by increasing depth rather than width, so I'm not sure if making that a 4x10 will get you double the spacing. ![]() In any case, we used #2 rough 2x12 Spruce, 16" oc on a 15' span with 60# LL (wood stove & water tank) and 10# DL and we passed structural checks with L/360 deflection (minimal bounce).Īccording to the calculators, you should be able to make 17'3" with #2 SPF 2x10, 12" oc. Joists, rafters and studs get some funky load offsets since they're repetitive members, but that's always in your favor if you did the load calcs based on single beam ratings. If you know the total load calculations, you can also find beam calculators on the Forestry Forum. You can also download their Post Frame Building guide. They also have span tables for joists and rafters and structural design date for beams and timber available for PDF download (I think you only have to pay if you get a hardcopy). Lodgepole Pine falls into the "Spruce - Pine - Fir" category. You can try the AWC Calculator for joists and rafters, but all calcs and tables for joists and rafters are geared toward 2x dimensional lumber. I'd be cutting pockets in the existing logs for joist bearing points. It will have 2圆 T&G subfloor (and as exposed ceiling in the lower room) with hickory for the finished floor above that. I'm wanting to use Lodgepole Pine rough cut 4x10's as floor joists, with a span of 17'4" max, 24" centers for an interior floor in an existing house. All I can find is related to using that size lumber as deck beams, which have different load characteristics. I've been looking for an applicable span rating chart that deals with 4x10's as floor joists. Small Cabin Forum / Cabin Construction / Span rating for 4x10'? Forums - Register/Sign Up - Reply - Search - Statistics.
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