Concrete slab hole fill (needed or not)


Old 07-15-14, 04:38 PM
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Join Date: Jul 2014
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Concrete slab hole fill (needed or not)

I have attached a picture of a hole that we have in our concrete slab in our bathroom. [ATTACH=CONFIG]34816[/ATTACH]

I've just taken out an old ceramic shower from my bathroom and will be installing a new walk in shower over this area with the hole. The hole is about a foot and a half square. We'll be using one of those pre-fab shower bases like KBRS and then tiling over it (the shower base will be about 3.5 feet by 5 feet.

My question is, do I need to fill in this hole with new concrete or will the shower base be solid enough that it can rest on the existing concrete without a problem.

If I do need to fill it in with concrete, what is the best way to handle the shower drain (which will be replaced)? I was thinking of installing the base of the new drain before pouring the new concrete and having it just above the level of the concrete (maybe a quarter of an inch) so that I can put in some self leveling material after and have everything flush.

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Old 07-19-14, 03:54 AM
Join Date: Dec 2013
Location: usa
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surprised no one's responded - yep, you're right - set the drain @ correct elevation then place bagg'd conc mix - 1 80# b = 2sf @ 4" but expect a bit less yield - good luck !

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