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Old 01-13-2011, 05:28 PM   #1
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Toilets and floor joists


Hi, all. First post for me. I'm adding a master bathroom to the side of my house. Block foundation, about 3-4 foot tall crawlspace. The room is approx 6x12, with the long wall parallel to the house. 6ft joists.

I'm the framer and the plumber, so I might as well make it as strong and as easy on myself as possible. I'm installing joists and rough plumbing now. The shower drain cleared the joists fine, but the toilet lands right on a joist on 16" centers. So, the question is: better to replace that joist with 2, 12" apart, or keep the joists at 16", stop short of the toilet, and make a header?

Thanks!

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Old 01-13-2011, 05:33 PM   #2
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Toilets and floor joists


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Originally Posted by ratherbefishing View Post
Hi, all. First post for me. I'm adding a master bathroom to the side of my house. Block foundation, about 3-4 foot tall crawlspace. The room is approx 6x12, with the long wall parallel to the house. 6ft joists.

I'm the framer and the plumber, so I might as well make it as strong and as easy on myself as possible. I'm installing joists and rough plumbing now. The shower drain cleared the joists fine, but the toilet lands right on a joist on 16" centers. So, the question is: better to replace that joist with 2, 12" apart, or keep the joists at 16", stop short of the toilet, and make a header?

Thanks!
T he joist and decking are in already? Before you put your joists in you always layout for the plumbing first. If a joist center mark is in the way, you move the joist over at least 2' off the center of the waste. Add another joist because you've opened up your 16" center.

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Old 01-13-2011, 06:10 PM   #3
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Toilets and floor joists


I'd frame it the way you have enough room to run the waste lines, easily.
Either way will work.
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Old 01-13-2011, 06:28 PM   #4
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Toilets and floor joists


No decking yet. All the joists, except the one we're discussing, are in. All the joists so far are 16" apart. Trying to figure out the best way to clear the toilet drain.
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Old 01-13-2011, 06:41 PM   #5
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Toilets and floor joists


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No decking yet. All the joists, except the one we're discussing, are in. All the joists so far are 16" apart. Trying to figure out the best way to clear the toilet drain.
Pull the nails and move the joist at least 2" from the center of the drain. Now that puts you about 18" away from the last joist changing you 16" center giving you about 16-1/2" n between the two joists.. Put anther joist centered n between those and you'll be fine. No need t double anything.
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Old 01-13-2011, 07:21 PM   #6
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Toilets and floor joists


For my house when they built it about 70 years ago, they placed another joist aprx 6" behind the one that the tub drain went through. So, basically I have two joists within 6", with the one directly behind the tub drain notched because there used to be a drum trap on the tub & one on the backside of the 4" vent stack with stack between the joists. Unable to direct load the photo here, so linked to it on flickr http://www.flickr.com/photos/51485689@N04/5352888123

That is actually drywall dust on the El from when we redid the bathroom.

Last edited by gregzoll; 01-13-2011 at 07:34 PM.
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Old 01-14-2011, 04:34 PM   #7
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Toilets and floor joists


Thanks. I'll just replace the one joist with two, spread anough for the drain.
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Old 01-14-2011, 06:48 PM   #8
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Toilets and floor joists


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Thanks. I'll just replace the one joist with two, spread anough for the drain.
That's all you need to do.

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