Wood beams
Wood beams
(OP)
When we say 4x blocking or 6x beam, which dimension of the beam are we referring to? Is it the width or the depth? Also what if it is a flat beam?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Wood beams
RE: Wood beams
RE: Wood beams
RE: Wood beams
And just as an aside, my pet peeve is draftsmen who put 2"X4" (or whatever) on a drawing when indicating a given framing member. That means 2" by 4", when they mean a 2x4 which is a piece of wood that is nominally 2"x4" but measures something completely different.
RE: Wood beams
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RE: Wood beams
RE: Wood beams
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RE: Wood beams
RE: Wood beams
RE: Wood beams
These are related to the visual grading rules, which dictate different timber grades judged by size of defects, slope of grain, splits or checks and other factors.
2 & 4 inch nominal lumber is typically kiln dried before grading, thicker lumber (say 6x6's) are not. This is due to physical difficulty of drying out thicker materials and economics. Depth-wise, a 2x4 and a 2x12 can both be kiln dried and can be grouped in the same grade as far as stresses.
RE: Wood beams
"I believe the table you are referring to lists properties for lumber up to 4" inch thickness in one column, then posts and timbers, etc."
Yes, we are referring to the same table. So let me get this straight:
2x4 according to NDS : 1.5" width, 3.5" depth
2x4 according to UBC: 1.5" thickness, 3.5" width
Thanks.
RE: Wood beams
Also note that the 2015 NDS Supplement uses similar terminology with some clarification. For instance, the size factor table on page 32 has one column labeled "Width (depth)" and another column labeled "Thickness (breadth)"
RE: Wood beams