Hi,I'm going to build a non-load bearing half wall in the kitchen to create a peninnsula. The wall will conceal the water and electric for the sink cabinet.I'm wondering what the maximum size schedule 40 PVC pipe is that I can run up through the floor plate of the half-wall. If I frame the wall using 2x4s, then a 3 inch PVC pipe will practically cut the plate in half. I'd prefer to avoid building the wall out of 2x6s, just to keep the wall size down. (I'm required to use a 3 inch pipe, but nothing was said about the wall thickness.)I'm also going to put down 1/4 inch bc plywood underlayment over an existing vinyl floor. Should I put the underlayment down first, then build the wall, or put the wall right on the old flooring. (Don't want to pull up the old floor because of asbestos.)Anyone have any input?Thanks

Why do you need to run a 3" pipe, a sink and a dishwasher doesn'trequire more than 2".

3 Inch PVC in a Half Wall?

Apr 05, 2008 26 Replies

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Wayne Whitney 18 years ago

Re: asbestos, how will you handle putting holes in the old floor, e.g. for the 3" drain pipe?

As to the underlayment, I don't really have an opinion, but I think the principle concern should be the compressability of the layers between the bottom plate and subfloor. If you are going to use threaded rod to put the half wall in compression, then perhaps it is better to put plate on the vinyl and just let it compress. If you aren't, perhaps it is better to run the plywood under the plate, so the vinyl will compress less. But I don't really know.

BTW, my sheet goods installer recommended 3/8" underlayment, but I suppose that it may depend on the smoothness of the existing floor.

Cheers, Wayne

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shivermetimbers 18 years ago

RicodJour wrote in news: snipped-for-privacy@d1g2000hsg.googlegroups.com:

No inspector is directly involved...yet. I asked a few questions during the planning phase. As you say, if you mess around with the plumbing, they make you update it, even if it's a lot of work. However, merely moving a sink can be interpreted as not really messing with the plumbing. The bottom line is, if I don't want to re-plumb the entire house, I have to keep it as is. I'd probably put in an AAV if I wasn't going to sell the place. Thanks for your thoughts on this.

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shivermetimbers 18 years ago

Wayne Whitney wrote in news: snipped-for-privacy@pizza.private:

I hadn't thought of a copper penetration; that's a good idea, but I think I'm just going to go ahead with a 2x6 wall to avoid anything stupid. Many have pointed out that since the wall isn't load bearing it wouldn't really matter if the plate is cut in half, but I'm thinking that if I want to do it right, it should be 2x6. I'm going to sell the house. Don't want to create problems.

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shiver 18 years ago

Wayne Whitney wrote in news: snipped-for-privacy@pizza.private:

I hate to admit it, but I honestly hadn't thought of that. Cutting one hole should be safer than tearing up nearly 400 square feet of tile! I'll have to think about that. I have the safety equipment (asbestos rated filter mask, gloves, etc.), but I don't want dust getting all over the house. Hmmm.

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Edwin Pawlowski 18 years ago

Asbestos in floor tiles is not a big deal so don't fret over it. The tile can be easily removed and disposed of also. since any asbestos is encapsulated.

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S. Barker 18 years ago

cordless drill, holesaw, water. No dust. done.

the tile probably doesn't have the dreaded asbestoes in it anyway. One days worth certainly wont hurt you even it it did.

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RicodJour 18 years ago

I don't want to belabor the point...points, I'll be bringing up another one in a minute, but your code is behind the times regarding an AAV. It's not illegal, it simply doesn't conform to the existing code. Your whole plumbing _system_ doesn't conform to the current code! So what do you think you're really doing by sticking with 3" pipe? Please explain a single benefit of going with a 3" pipe.

The other point...there will be cabinets against this new knee wall, and freestanding cabinets don't need additional support, so why does attaching cabinets require stiffening the knee wall at all?

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