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toubob 02-15-2007 02:29 AM

old uneven bathroom floor
Hello all

I am in the process of redoing my very old house. I am ready to finish up a bathroom I recently gutted. The floor is quite unven. I took care of the floor in terms of shoring up the joists and such. But I want to level the floor while adding strength to the floor.

My subfloor is 3/4" fir flooring tongue and groove, the joists are supported every 5' by a large beam. The floor is uneven up to an 1" in spots. I want to lay slate down. The use of deck mud sounds interesting.

Does anyone know if using deck mud and slate will be to heavy for my floor. Also do I have to lay the tile down on the mud floor directly. The idea of having to lay my tile out on a decent grid system scares me if I have to do the whole bathroom and if it has to be done quickly.

Any feedback on thickset beds would be great.



redline 02-15-2007 10:29 AM


Originally Posted by toubob (Post 33512)
Hello all

The floor is uneven up to an 1" in spots. I want to lay slate down.



If the joists were corrected then why is there still a 1" drop?

toubob 02-15-2007 01:04 PM


I looked at the joists and jacked up the support beams so the joist were level to each other, but it didn't correct the level of the floor. I figured that there might be a bow in a joist or two. The floor is 100 years old so who knows. The floor has a central depression almost like a trough where a wall used to be that I took out. I do know that there is nothing level or straight in the house.


redline 02-15-2007 01:18 PM

Is this on the first floor or second floor?

cibula11 02-15-2007 01:39 PM

You can lay a straight piece of lumber across the floor to see exactly where the slope starts and ends. Then when adding tile you could add more thinset to this area, or what I would do is to get some leveling compound....its a concrete mix that self levels. This would fill in any low areas. If you choose this route you'll need to buy a primer that you put on the subfloor so that the leveling concrete will adhere to it.

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