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Old 11-24-2014, 10:07 AM  
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basement bathroom subfloor


Hi there,

I am in the middle of a basement reno which is going fairly well. Learned a lot, made some mistakes (which were fixed) but things are going nicely.

The one area that I still haven't made up my mind on is the bathroom subfloor.

There is some waves in the floor that I am worried about....I was thinking of putting down a SLC, which I would then place ditra and tile on top of that. I will be installing a pre-fab shower which I havent bought yet and I am thinking that having a perfectly level subfloor will help with that. I don't want the pan cracking after a year or two because of an uneven subfloor.

Alternatively, I could use dri-core or delta-fl with 5/8 T&G plywood or OSB. I'm trying to ensure the threshold with be approximately the same height as the carpeted area (which will be delta fl with T&G OSB).

Any thoughts or advice?
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Old 11-24-2014, 11:59 AM  
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One thought. Do not put OSB on a concrete floor. It WILL fail.
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Old 11-24-2014, 03:18 PM  
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Quote:
Alternatively, I could use dri-core or delta-fl with 5/8 T&G plywood or OSB.
Oh no you won't. You can not put tiles over that stuff.

Your original plan of SLC plus Ditra is a great way to go. Do the SLC to level the floor before the shower base.

The ceramic floor will be lower than the Delta FL/carpet and it's the way it should be.

Jaz
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Old 11-24-2014, 05:22 PM  
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Thanks guys

How much lower should the tile be compared to the carpet....in other parts of our house the carpet underlayment is virtually the same height as the tile.
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Old 11-25-2014, 04:44 PM  
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If it's concrete maybe this will help, you can rent one.
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Old 05-25-2015, 09:10 AM  
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Quote:
Originally Posted by JazMan View Post
The ceramic floor will be lower than the Delta FL/carpet and it's the way it should be.

Jaz
Hi Jaz,

Can you elaborate a little on this? I should be doing this (finally) this week. My intention was to use SLC and ditra to raise the bathroom floor height to the height of the finished floor of the adjacent room (1.5").

Is that not advisable? I'm a little torn since ensuring a flat transition room to room means spending about $300 on SLC and primer.

Thanks,
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Old 05-26-2015, 04:08 PM  
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I wouldn't raise the floor the entire amount. When you start level, the carpet will be higher because of the padding and the length of the carpet pile. The carpeting will compress so you should feel the edge of the tiles and the higher carpeting makes it look more luxurious.

You should be able to keep the tiled area a bit lower, maybe ", but that depends on the type of carpeting.

Remember SLC will try to find its own level and doesn't care where you want it to flow to. It needs a little help to flow too, but don't mess with it too much.

Jaz
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Old 05-26-2015, 07:42 PM  
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The finished floor isn't carpet, so i don't expect compression. In that case, I take it that its okay to be flush with the finished floor?
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Old 05-26-2015, 09:32 PM  
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OH, it's not carpet? Where did I get that idea?

Quote:
Originally Posted by Onagoth
I'm trying to ensure the threshold with be approximately the same height as the carpeted area
Quote:
Originally Posted by Onagoth
How much lower should the tile be compared to the carpet
Not knowing (now) what types of flooring will meet in the jamb, I guess flush will be good. I was also thinking you might want a marble threshold, but maybe not?

Jaz
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Old 05-26-2015, 09:51 PM  
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Oops....forgot the detail in the first post....we decided against carpet. ..haven't figured out the transition yet. ...
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Old 05-29-2015, 10:24 AM  
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To do the right job with SLC, try to follow complete directions mentions behind the pack, Primer is a big yes when making SLC or else there is high risk of SLC not bonding properly.
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