Return to index: [Subject] [Thread] [Date] [Author]

Re: 3x_ versus (2)-2x_

[Subject Prev][Subject Next][Thread Prev][Thread Next]
At 07:17 AM 01/28/2000 -0800, you wrote:
>UBC Table 23-II-I-1, footnote 3 clearly has the minimum requirement for"all
>framing members receiving edge nailing from abutting panels shall not be
>less than a single 3-inch nominal member (for allowable shear >350PLF)" This
>would clearly indicate that 2-2x's are not acceptable. As an alternative,
>4x's may also be used.  In the 5 jurisdictions that we do the Building
>Department administration for, 2-2x's are not acceptable. Conceder is
>failure occurred how 2-2x's instead of the required minimum single 3x would
>stand in a court of law.
>Thanks Tom
Well, I'm considering that last sentence. How _would_ a court of law figure
what the code means? Plain meaning of words is the court's first resort, but
as usual, the code in this is "clearly" inarticulate and ambiguous. Also,
the code itself gives the power of interpreting the code to the local
building official, and such interpretations are often elusive, when not
requested ahead of time, and tend to vary. Courts however can override
administrative officials as to what law means. 

But the court would tackle the question as a subordinate part of some bigger
issue, such as determining if someone was negligent and it harmed someone
else. Certainly the court would rely substantially on expert testimony. 

Lots of opinion already expressed on this list says that resistance to
splitting due to multiple nail lines is why 3x lumber is in code. Dividing
the nail lines into two separate 2x pieces does admit of rational analysis
in accordance with accepted principles of mechanics, per Chap 16, and on its
face addresses the splitting problem cited. The code does allow alternate
means of materials construction than the one specified, if equivalent or
better. Lastly, neither of the 2x's receives edge nailing from panels in the
plural, only from a single panel, so there is semantic support for use of
two-2x after all. The "member" that receives nailing from _both_ abutting
panels is a two-2x nail-laminated member, which is "not less" dimensionally
or functionally than a single 3x. I see code compliance here. 

As for use of super-fine-print footnotes to add more stringent exceptions in
code (instead of merely adding explanations or less stringent exceptions by
footnote to what's in the code body): This is a deplorable practice that
ought to be outlawed. This sorry, deceptive habit was called to my attention
by a Calif SE friend while he was in law school. Now he hires out to get us
out of the trouble our pals in codewriting help get us in to.

Charles O. Greenlaw  SE  Sacramento CA