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-   -   Using Sand To Fill Low Spots (http://www.diychatroom.com/f5/using-sand-fill-low-spots-172615/)

Chris Sweeney 02-21-2013 07:54 PM

Using Sand To Fill Low Spots
 
I will be tiling a bathroom floor. The 3/4" plywood sub-floor I will be working on has a few low spots in it. Now, I've used floor leveling compounds before, but an old contractor friend of mine said I can just use some sand to fill the low spots before laying my cement backerboard down. Has anyone ever heard of this, or is it a bad idea? Thanks!

joecaption 02-21-2013 08:01 PM

So you want to lay down a non compactable material that's sure to flex?
How low are these low spots?
What's there now for a subfloor?

Chris Sweeney 02-21-2013 08:08 PM

Quote:

Originally Posted by joecaption (Post 1122017)
So you want to lay down a non compactable material that's sure to flex?
How low are these low spots?
What's there now for a subfloor?

The low spot I'm concerned with is basically a 1/4" valley over the span of about 3 feet. Subfloor is 3/4" plywood.

If I can't use sand, I'll just go back to using floor leveling compound; I just wanted to see if anyone else has ever used sand for this purpose, since it sounds so much simpler. I thought it probably sounded too good to be true though.

joecaption 02-21-2013 08:34 PM

I would install the 1/4 tile board in a bed of thinset, use non gypsom floor leveler to fix that low spot then set the tile.


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