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Old 11-27-2009, 11:06 AM   #1
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Depth of Joists for plumbing


Our garage is being converted using 2x8 ontop of slab. My question is will a 2x6 be wide enough to allow for plumbing p-traps and slope (the garage will have a full bathroom....all fixtures will be along one wall, so their wont be much slope involved before it connects to the main stack in the house).

Would 2x6 work or should i go larger to a 2x8?

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Old 11-27-2009, 11:26 AM   #2
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Depth of Joists for plumbing


Presuming the joists are bearing directly on the garage floor and are not in span, you can drill or notch them at will without concern for their strength. If they're in span then you will almost certainly need to reconsider the methods you're using.

Your pipes less than 3" diameter need to slope at least 1/4" per foot of run. Your 3" pipe can slope 1/8" per foot. The depth of your joist to accommodate that slope depends on the length of run and the configuration you choose for the floor flange, etc.

I'd think it would be tough to squeeze the vertical to horizontal transition in 3" under the toilet's floor flange in a 2x6.

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Old 11-27-2009, 12:51 PM   #3
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Depth of Joists for plumbing


Thanks. So woudl 2x8 be the smallest joists I could use? I just don't want to get too large because I'll be giving up additional head room.
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Old 11-27-2009, 11:02 PM   #4
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Depth of Joists for plumbing


Unfortunately, I'd have to be standing there looking at it with a level and a tape measure in order to accurately answer that question for you.
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