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Using Sand To Fill Low Spots

1682 Views 3 Replies 2 Participants Last post by  joecaption
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!
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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.
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