Wood joists smaller than actual standards
Wood joists smaller than actual standards
(OP)
Hi everyone,
I encountered wood joists which their actual size is 1.5 by 9 inch (exactly). They are SPF No.2.
Why does it measure this way and how would these joists be checked using the building code tables? Would these be considered deficient 2x10? Or buffed 2x8?
I encountered wood joists which their actual size is 1.5 by 9 inch (exactly). They are SPF No.2.
Why does it measure this way and how would these joists be checked using the building code tables? Would these be considered deficient 2x10? Or buffed 2x8?
RE: Wood joists smaller than actual standards
RE: Wood joists smaller than actual standards
RE: Wood joists smaller than actual standards
RE: Wood joists smaller than actual standards
You do understand that the actual size of a 2x10 is 1.5 x9.25, right? Just take a look at the NDS supplement Table 1A.
If it's 1.5" by 9.0" then it is a little bit small. That might mean it shrank more than expected. Regardless of why it's this size, you can still use the NDS exactly as you would before. You just use a slightly different area, moment of inertia and such. But, anywhere the code refers to nominal size (like the basic design values) this would still be considered a 2x10.
RE: Wood joists smaller than actual standards
RE: Wood joists smaller than actual standards
RE: Wood joists smaller than actual standards
why would field ripping affect the allowable design properties ChorasDen?
RE: Wood joists smaller than actual standards
If a a 2x10 is no2 with a 4 inch knit along the centerline and a 2x6 can only have a half inch knot at its edge, ripping it down will lead to a 2x6 or so with a massive edge knot that drops it to less than no2.
(I made up sizes for the example)
RE: Wood joists smaller than actual standards