We are making a hall bath bigger by taking away a closet right outside the bathroom. The bathroom had tiles and the hallway and closet had the original woods floors. After removing the wood floors, there's about a 1.5" height difference. Can I pour regular concrete to bring up old closet space slab to height? Besides bonding adhesive, is there anything elseI should do ? Thanks

I would maybe just add some floor decking. I wouldn't think you would want to pour concrete on top of concrete like that and have a cold joint.

There are some patching materials that will go this depth. Just make certain the area is prepped well.

Go to WhiteCap or CMC Construction Service and ask the counter folks for help. Tell them what you're looking at doing and they can steer you in the right direction.

I would not place standard quickrete in this configuration, that is begging for failure and having to replace it.

I worked at CMC for over a decade. But that's been over a decade ago so I don't remember the products like I used to.

I've done this before with a bonding agent then going back with self-leveling concrete.

How many square feet are you talking about? That may figure in to a particular plan.

Maybe just layers of 1/2" Durock or Hardi (if area is already fairly level) with adhesive in between layers?

Is this a slab on grade house or a pee and be structure?

it's a slab and about 5'x10' that I need to raise.

Can you tell if the old bathroom floor is dropped as well ?



I have seen where they drop the whole house 2 1/4 and then run 2x4 to nail the 3/4 floor to. In the bathroom i have often seen where they poured 1 1/2 to make up the difference but it almost always broken and in pieces when then old school tile floor is removed.

I have seen this done in larger areas and they usually use a fiber reinforced concrete mix to pour it that shallow

1988PA-Aggie said:

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How many square feet are you talking about? That may figure in to a particular plan.

Maybe just layers of 1/2" Durock or Hardi (if area is already fairly level) with adhesive in between layers?

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This sounded like a good idea to me when I read it. But maybe not for a space as large as 5'x10'? Not sure

Sakrete Sand Topping Mix is what you need

50 square feet is perfectly fine to just use floor leveler which is a really thin cement. Watch a few youtube videos over it. I'd use it over standard concrete because the large aggregate (rock) in store bought sack concrete will weaken the concrete when poured in such a thin layer. Floor leveler is specifically designed for this with a lot finer aggregate (usually just sand) that wont crack nearly as easily.

Biggest things to make sure your leveler goes down well:
-Put something to keep it off the walls. You'll see a lot of this thin foam strips used in videos.
-The cement will be thicker (as in viscousness, not depth) than you think. It will also not automatically go down level. Make sure you've got a trowel and something to screed the surface to keep it from forming surface tension and being unlevel.