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Old 09-02-2012, 12:28 PM   #16
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plumbing rough-in for a concrete slab


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which side is the sewer connection on?

where is the water heater going?

is this going to be on a slab or raised with a crawl space?

the bathroom can be vented with one and the kitchen needs one also.

depends on where you need the floor drain. why do you need a floor drain for the water heater?
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Hi Danny,
The heater is going in the bottom right hand corner of the plan( I know, I need to improve the drawing but don't have the technology yet). The heater will be for in in floor heating. I would like a drain in that corner in case the hot water tank blows. Also, it's a code requirement here :). I would also like to tie into that drain and run a pipe in the wall in case I want to install a little washing machine in that corner.

This is a slab, so of course it's VERY important that I plan this well!
Thanks for your input!

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Old 09-02-2012, 12:41 PM   #17
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plumbing rough-in for a concrete slab


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You do realize even with a concrete floor you will still need to protect the floor with a proper shower liner system? If you do not, the oils and soap scums that you rinse off of your body will absorb into the concrete and make it stink. You need to figure your recess of the shower based on the size of the shower, as the sub base of the shower will need to be sloped so that the liner will be sloped, as well as the finished surface all 1/4" per foot. The overall thickness of the drain you get will make a big impact on the depth.... 2" does not sound like enough to me.
I didn't know I would need a liner for this. Couldn't I just seal the cement with something to make it impervious rather than a full on liner? It could be tricky finding a liner to suit, and custom made would be costly.
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Old 09-02-2012, 12:50 PM   #18
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plumbing rough-in for a concrete slab


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I didn't know I would need a liner for this. Couldn't I just seal the cement with something to make it impervious rather than a full on liner? It could be tricky finding a liner to suit, and custom made would be costly.
If you're not using a fiberglass pan, then you need to "Make one" using approved methods and materials read : (custom). Those are your options. If you opt out of using any kind of a pan system, do expect that the concrete will absorb all of that crud and become very smelly. Concrete is very porous and I assume that even with the best sealing methods, water will find a way into the concrete anyway.

I saw your post about a floor drain in case the heater blows : Using a floor drain is fine, but with a floor drain you'll want a trap primer to keep the trap from drying out and stinking up the house. Your other option would be to put the water heater in a pan, and plumb a drain from the pan out of the building above grade. This will be much cheaper, and will work just as well, assuming the heater is going on an outside wall.

I made a quick sketch of the way I would plumb it (attached). Not sure if it meets code in your area or not... I figure the sewer entering the building about 2-1/2 to 3 feet from the corner of the building under the sliding glass door.
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Old 09-02-2012, 01:20 PM   #19
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plumbing rough-in for a concrete slab


Thanks Alan,
It seems like I will have to sort out a liner for this shower. Happy to find this out now rather than later with a stinky bathroom!

Running the hot water tank drain outside the slab is a good idea, i will do that. And as far as having a drain for a washing machine goes, I don't think I really need a drain because the small kind of washer that will fit in this place could be the type that just hooks up to the kitchen sink.

I'm finding the plumbing sketch hard to read. It's not clear to me where the drains tie into the system, particularily in relation to the toilet.
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Old 09-03-2012, 07:23 AM   #20
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plumbing rough-in for a concrete slab


To waterproof the concrete----there are many ways---if you tile it--use a paint on waterproofing like Hydroban by Latacrete or one of the other good brands----
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Old 09-05-2012, 02:22 PM   #21
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plumbing rough-in for a concrete slab


To oh mike and others who need to open a .pdf file occasionally: http://get.adobe.com/reader/ at this site you can download free software that you can install on your computer so you can automatically open and read .pdf files. Adobe Reader is what you need. (Click no to refuse any add ons that you don't want.)
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Old 09-05-2012, 11:14 PM   #22
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plumbing rough-in for a concrete slab


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To waterproof the concrete----there are many ways---if you tile it--use a paint on waterproofing like Hydroban by Latacrete or one of the other good brands----
I just watched a 10 min youtube vid on the Hydroban and it looks as though that will work for me. Thanks oh'mike for the info!

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