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-   -   Patching sub-floor cement board (http://www.houserepairtalk.com/f13/patching-sub-floor-cement-board-14528/)

Kradak 08-05-2012 05:25 PM

Patching sub-floor cement board
 
http://www.kradak.com/Uploads/1-IMG_7383.JPG

My master bathroom used to have a vinyl floor and a fake modesty wall separating the shower/toilet zone from the vanity zone. My wife and I aren't as modest as when the house was built in 1965--heck, we don't even sleep in separate beds!

Anyway, I pulled up the flooring and got rid of the fake wall. I pulled up the 2x3 sole plate, leaving a gaping hole down to the wooden sub-floor.

Do you have any suggestions as to what I should do here?

(a) When tiling over, just make sure the tiles are large enough to span the gap--the tile should be strong enough
(b) Fill it up with leveling compound
(c) Fill it up with a concrete patch
(d) Screw in a 2 1/2" wide piece of durock and tape and mortar the gaps
(e) Pull up the whole floor and re-do it all, or
(f) Torch the place and start fresh with the insurance money

Thanks,

Chris

nealtw 08-06-2012 03:57 PM

It depends on what the second sheeting is and how flexable the floor is. You may want to remove and replace it, if it is 1/2" particle board. If it is solid I would fill it with wood and cover the whole floor with a concrete underlayment.

Kradak 08-08-2012 05:01 PM

Neal,

The second sheet with the cutout shown is 1 1/2" of a 'particle board', but in this case, the particles are aggregate and the board-like material is cement...

nealtw 08-08-2012 05:53 PM

Sounds like a substantial floor for vinyl. I think you could do (B), (C) or (D)but waite twenty minutes, someone will correct me.;)

isola96 08-08-2012 08:28 PM

Quote:

Originally Posted by Kradak
Neal,

The second sheet with the cutout shown is 1 1/2" of a 'particle board', but in this case, the particles are aggregate and the board-like material is cement...



You need to get down to the plywood. Particle board does not stay for tile. How much ply do you have from joists up?

nealtw 08-08-2012 08:42 PM

I think this room has had tile before and what he has is some sort of morter bed.

isola96 08-08-2012 08:55 PM

Quote:

Originally Posted by nealtw
I think this room has had tile before and what he has is some sort of morter bed.

Oh is that what I'm seeing in the picture?
Looked like more P&S over particle board.

Kradak 09-04-2012 07:52 PM

Thanks for the assist, guys. I've found an elegant solution: I sent my wife for a masonry course at the local CC and convinced her to do it: she will add a concrete patch to the holes and finish the whole floor with some leveling compound.

All I have to do then is the framing, and electrical, and lighting, and drywall, and plumbing...


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