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temetnosce 02-11-2012 12:55 PM

Installing a basement subfloor around floor drains
3 Attachment(s)
Hi All,

This is my first post. I am finishing my basement and am in the process of putting in my subfloor.

My basement is a level concrete slab with cinder block walls.
I do not have any moisture problems, but am installing a moisture barrier anyways.

On the walls, I first put Drylock.

On the floor I put down 1/2" rigid foam with a 1/4" gap on all sides. I filled the 1/4" perimeter with "Great Stuff" expanding foam. I tuck taped all of the joints and laid them off center.

On top of that I am laying 3/4" treated OSB (nailed down with powder driven masonry nails).

On top of the OSB I am going to be installing vinyl tiles. This part of the basement will be where my wife does laundry.

I have 2 floor drains in the concrete. Both are 4" black PVC pipe. One is used to drain from my HVAC/water heater. Another is not used for anything. (pictures attached).

My questions are:

1. For the drain used by by my HVAC/water heater, is it OK to simply cut out a square in the subfloor for access, or do I have to raise it so the top is flush with the new tile floor?

Attachment 45712

2. The drain that is not used - can I just cover over it with my subfloor? Do I need to do something special to plug it?

Attachment 45713
There is water in the bottom, but I do not plan on using it for anything. If I can't cover it, how can I raise it up and make it level with the tiles?

I also have a standpipe where my laundry and tub drains into.

Attachment 45714

I'd like to avoid calling a plumber.
Thanks much!


thien_to 04-23-2012 09:06 PM

Bump on this. I'm in the same boat and wondering if I need a cut out in the carpet and subfloor to access the drain or can I just caret over it.

rebelranger 08-06-2012 02:10 PM

You don't have to raise the drain to the new floor height but it'll look better if you do. You really need to cover the not used drain otherwise smell can enter into the room or the moisture will damage the floor above it. Just trim around the cleanout drain.

joecaption 08-06-2012 04:40 PM

I sure hope you meant a subfloor that's T & G like Advantec not just reguler square edged OSB.
Your also missing a step, You should not attach glued down tiles to OSB There needs to be a layer of 1/4 underlaymant sanded plywood layed so the seams do not line up with the seams below, attached every 4" on the edges and every 6 to 8" in the field.
Then fill in all the seams and flaws with nongypsom floor leveler or the flaws will show through the tiles.

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