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Unread 07-13-2022, 06:11 PM   #1
MiniMe
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Should I level the basement floor before tiling when there is a floor drain ?

This is an old house (built into the 60's) This drain seems to be there to deal with any flooding that might happen.



In the above layout:
1-bathroom
2-laudry room
3 hallway/storage area
4 hallway
5 kitchen with the drain (small circle on the rendering)
6 hallway

For sizing the picture is to scale and the tiles are 20"x20"

-I am tiling everything you see in the picture as tiled(square tiles)
-the drain seem to be there for flooding
-the north south axis of the picture the dividing wall is cinder blocks and I am sure the builder did not design the laundry room to drain to the kitchen
-there might be a drain in the #2 (laundry) but I doubt, there is no slope there
-the drain goes to the main drain of the house that drains the plumbing for 1 and 5 and their main floor counter parts situated just above 1 and 5.
-the 4 area has a little bit of slope in front of that door between 4 and 5 but 3 and 2 are pretty much flat and so is 6. The slope is centered in 5 and it sinks like bowl I think the lowest point is 3/4"

The point where it says ? is 1.75" above the drain. and so it the perimeter of the kitchen compared with the drain point

This will require quite a lot of self leveling concrete -is it doable? Is it advisable?

Is there a way to deal with this bowl like slope similar to this ?


Here are some quick measurements having as reference the point marked with a blue arrow (0)
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Unread 07-14-2022, 05:58 AM   #2
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If you've got that much variation over the floor, you'll have to do some degree of leveling to bring the floor into spec for those large tiles. If I remember correctly the tolerance is 1/8" in 10' and 1/16" in one foot (maybe two?). You're well beyond that in a number of places.

Specifically around the drain, you may be able to achieve what your picture shows if the floor drops off reasonably close to the drain. If it's more of a gradual slope, it may take more work.

My question would be, do you really need the drain? If not, I'd be tempted to cap it and cover it properly, and avoid a trip hazard in the middle of the kitchen.
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Unread 07-14-2022, 06:18 AM   #3
MiniMe
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That is my question too
I was hoping that the more experienced guys around have met more situations like these and they know what to do
I have no idea if the regular houses have these anymore and if the slope is so big
Also if you want to intentionally give your floor a slope I do not think that those tolerances matter anymore
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Unread 07-14-2022, 09:01 PM   #4
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Actually, the slope isn't the issue. It's how flat the floor is. Obviously, in the picture you posted the floor isn't flat enough around the drain to do full tile.

But flatness is everything when you're installing large format tiles like yours.
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Unread 07-15-2022, 07:05 AM   #5
MiniMe
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I am considering something like envelope cuts around that drain or just using thinset to make it a v like slope (2 planes) instead of the bowl shape around the drain
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