Easy fix for hole in concrete floor?

[martinthern]

Hi,
A few years ago when we were renovating the bathroom and had drillers at home, we took the opportunity to make holes for drainage, etc., for another future bathroom. It's a concrete slab that's about 30 cm thick. Now, unfortunately, the bathroom plans look completely different and I would like to repair the holes we won't need until the day we restart the project.

The holes are between 20-15 cm in diameter and, as mentioned, the floor is about 30 cm thick. The room below is a room in the basement. The idea is to possibly put on some simple wooden floor until the bathroom project starts again.

I suppose the best thing would be to try to fasten some form of reinforcement in the holes and cast with some type of cement/mortar. But I started to wonder if one could try to fill the holes with foam, lay on some simple flooring, and just patch it in the ceiling of the basement room below. Does that sound like a completely idiotic idea or does anyone think it could work?

Best regards,
Martin

 

[Semiproffset]

Hi,
A few years ago when we renovated our bathroom and had a hole cutter at home, we took the opportunity to make holes for drainage, etc. for an additional future bathroom. The concrete slab is about 30cm thick. Unfortunately, the bathroom plans have changed completely, and I would like to patch up the holes we won't need until the day we restart the project.

The holes are between 20-15cm in diameter and the floor is, as mentioned, about 30cm thick. The room underneath is a basement room. The idea is to possibly lay a simple wooden floor until the bathroom project starts again.

I assume the best course of action would be to try to attach some form of reinforcement in the holes and cast with some form of cement/mortar. But I started to wonder if one could try to fill the holes with foam, lay a simple floor, and just fill in the ceiling in the basement room underneath. Does that sound like a totally ridiculous idea or does anyone think it might work?


Best regards,
Martin

Yes, that works well. You can also trim the foam a bit or not fill it all the way up and then fill with a fiber-reinforced filler before laying the floor.

 

[martinthern]

Yes, it works well. You can also trim the foam a bit or not fill all the way up and then use a fiber-reinforced filler before laying the floor.

Yeah, then I should probably try that.
And filler and such adhere well enough to the foam so it doesn't come loose or anything when I'm filling the holes in the ceiling in the room below?

 

[BosseHansson]

It will probably work to apply spackle directly on the expanding foam. Alternatively, you could buy cellplast and cut out the shape to press it in. The expanding foam might need to be shaped afterwards unless you are very experienced in using it.