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Old 05-10-2013, 10:36 PM   #1
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Foundation for outbuilding add-on


I'm adding a 5x12 bathroom to a 40x40 outbuilding with a slab foundation. Any recommendations on what to use for the foundation of the bathroom? I'd rather not do a slab as I don't have much experience with concrete. The location is western Washington state where it doesn't get very cold for longer ions of time.

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Old 05-10-2013, 11:20 PM   #2
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Foundation for outbuilding add-on


is the floor in the bathroom going to be at the same level as the outbuilding? how high above grade is the existing slab?

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Old 05-10-2013, 11:28 PM   #3
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Foundation for outbuilding add-on


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is the floor in the bathroom going to be at the same level as the outbuilding? how high above grade is the existing slab?
Yes, the bathroom would be the same level as the outbuilding. The existing slab is only 2-4" above grade.
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Old 05-10-2013, 11:48 PM   #4
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Foundation for outbuilding add-on


you could put in a foundation with a crawl space (wooden floors) but in my opinion wouldn't make much sense .... you have to have access to the crawl space, at least according to most building codes (your code may differ). the closer wood is to the ground the more issues you'll have with it, even preservative treated.
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Old 05-10-2013, 11:49 PM   #5
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Foundation for outbuilding add-on


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I'd rather not do a slab as I don't have much experience with concrete.
part of the DIY experience is getting experience at things you don't normally do ....
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Old 05-11-2013, 12:00 AM   #6
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Foundation for outbuilding add-on


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part of the DIY experience is getting experience at things you don't normally do ....
Oh I've already jumped off that bridge- T'd off the hot and cold copper pipes and wyed off the sewer line. I'll be adding a sewage pump as well and had no prior plumbing experience before this project. I guess I'm just weary of having to get a concrete delivery and think I probably can't do a slab without a truck delivery, ie, too much/ big to mix myself.
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Old 05-11-2013, 12:26 AM   #7
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Foundation for outbuilding add-on


see if you've got friends with experience ..... amazing what beer and bar-b-q can accomplish ..... we have some knowledgeable and talented concrete pros on here and I'm sure they'll chip in with advise (they work hard and are probably fast asleep right now). Unless my math is off you're looking at less than a yard of concrete ..... If you don't feel up to it get some quotes from some local contractors.

Good luck!

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