Rim Joist too Tall?


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Old 09-02-20, 05:47 PM
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Rim Joist too Tall?

I had an 4 foot section of rim Joist installed to replaced rotten ones. This house has two sandwiched together. the new ones seem to be 1/8" taller than the old one. Is this common. Is it that the new ones now days are cut different or from manufacture. I would have never thought to measure. I assumed a 2x10 was a 2x10. Should they have ripped it or will it shrink over time when it dries more. This creates a problem. Now 12 " x 3' section of sub floor that was replaced is up 1/8 " above existing floor. should I cut sub floor now to lay just on the joist? is this a common method because this is how someone installed it last time when it rotted 20 years ago. Thanks.
 
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Old 09-02-20, 06:42 PM
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Dimensional lumber will commonly vary 1/4". Especially when you get over 2x8's. If its too big rip it down or trim it with a hand (power) planer.
 
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Old 09-03-20, 02:51 AM
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Did you buy kiln dried wood or is it pressure treated?
 
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Old 09-03-20, 03:55 AM
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I assumed a 2x10 was a 2x10.
Dimensional lumber has never been dimensional since the 1900's, here is more information that you probably wanted to know!

Harvard Design Magazine: Nominal Versus Actual: A History of the 2x4
 
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Old 09-03-20, 03:59 AM
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It is not pressure treated.
 
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Old 09-03-20, 04:44 AM
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Since it's not PT the wood should be dry and not expected to shrink. I'd shave/rip 1/8" off of that joist.
 
 

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