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Posted by PaulS on March 29, 2007, 1:33 pm
> PaulS wrote:
>> It could be dimensional lumber shrinkage if the top unit is supported by
>> standard lumber. I think a 2x12 for example, will shrink about 1/2 inch
>> against the grain. So if the joists where set directly on the supporting
>> lumber, it could cause a dip in the floor. Just what I've read, no
>> personal experience, I'm just a programmer.
>> Paul
>>> I placed a bid on a garden style condominium that is 2 floors. My
>>> unit would be on the second floor. The living room floor is a little
>>> slanted. There is of course a unit below me.
>>> Does anyone know what could possibly have happened. The condo was
>>> built in 1984.
>>> Is there something I should do? thankyou for any info.
>>>
>>
>>
>
> Modern kiln-dried dimensional lumber should not shrink to any noticeable
> degree. Now if you are talking rough-cut green lumber, then, yes,
> shrinkage tangential to the grain is significant as, to a lesser degree,
> is radial shrinkage.
>
> Matt
My comments were based on pg 102-103 of Journal of Light Construction.
"Kiln-dried lumber is stamped K-D (kiln-dried) or S-Dry (surface dry), and
is shipped with a moisture content of about 19%... In a completed building,
framing eventually dries to an average of 6% to 11% moisture content.." An
example is given of two 2x12 girders supporting a second floor. It states:
"The two 2x12 girders in this building will shrink enough to cause a 1/2-in.
drop in the second-floor level- enough to cause nail pops and cracks in the
finishes."
Maybe shrinkage is negligible in your region, so it is not an issue for you?
Probably the first response - poor work or settling- is what happened.
Paul
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