Fixing Hole in Concrete Floor Following Leak Repair

Dats_rite · 27-03-2020 12:22PM #1

Hi all,

We had a leak under kitchen floor we have since got fixed. There is a hole approx 500mm x 200mm x 100mmdeep in the flooring want to fill. I was thinking a sand cement mix that could pour into the hole like a grout prior to tiling.

Does anyone have any idea what I should use or is the grout option above acceptable or likely to cause more issues?

Dats_rite · 27-03-2020 12:24PM

Dats_rite wrote: »

Hi all,

We had a leak under kitchen floor we have since got fixed. There is a hole approx 500mm x 200mm x 100mmdeep in the flooring want to fill. I was thinking a sand cement mix that could pour into the hole like a grout prior to tiling.

Does anyone have any idea what I should use or is the grout option above acceptable or likely to cause more issues?

Pic attached

Dats_rite · 27-03-2020 12:25PM

Dats_rite wrote: »

Pic attached

2nd pic

TheBoyConor · 27-03-2020 12:26PM

You can buy bagged dry mix concrete that you can wet and mix up and it will be fine.

Make sure you check the damp proof membrane and if it is badly damaged put down a patch of DMP

Dats_rite · 27-03-2020 12:29PM

TheBoyConor wrote: »

You can buy bagged dry mix concrete that you can wet and mix up and it will be fine.

Make sure you check the damp proof membrane and if it is badly damaged put down a patch of DMP

So just put the DPM at the bottom and concrete above it? Might just do that anyway just incase the DPM is damaged.

Thanks for the advice

listermint · 27-03-2020 12:37PM

dont patch that up for 2 weeks or so. Let the pipes settle in. If its heating system let it run hot and cold. if its too another supply make sure to use it.

You need to be sure those pipes and the surrounding area are dry prior to cementing that up. If its not world of pain again.

joints in cement are the worst

Dats_rite · 27-03-2020 12:47PM

listermint wrote: »

dont patch that up for 2 weeks or so. Let the pipes settle in. If its heating system let it run hot and cold. if its too another supply make sure to use it.

You need to be sure those pipes and the surrounding area are dry prior to cementing that up. If its not world of pain again.

joints in cement are the worst

Agreed, I've had the hole open for about 6 weeks now so there is no leak. With the new kitchen we need after the leak, those pipes are not going to be used so will be capped off

jack of all · 27-03-2020 12:47PM

Those exposed pipes need to be lagged before concreting in- for two reasons- to allow for thermal movement without restriction and secondly to isolate the copper pipework and brass fittings from contact with cement which will cause pin hole leaks/ porosity over time. So, patch up DPM as best you can, lag pipes as best you can and cover all exposed copper and brass to prevent direct contact with cement. When patching in with sand/ cement or concrete I'd prime the edge of the hole with a bit of PVA brushed in first.

GreeBo · 27-03-2020 01:54PM

Dats_rite wrote: »

Agreed, I've had the hole open for about 6 weeks now so there is no leak. With the new kitchen we need after the leak, those pipes are not going to be used so will be capped off

6 weeks?

From your second pic I still see damp in the substrate to the left and possibly on the joint to the right....

What floor finish are you going for?

I'd roughly fill with a smix as suggested above and then top off with a self levelling compound to match floor height.

27-03-2020 01:56PM

Nobody going to ask why that earth cable is concreted into the floor ?

listermint · 27-03-2020 02:06PM

BrownFinger wrote: »

Nobody going to ask why that earth cable is concreted into the floor ?

Super common practice in the 80s

Dats_rite · 27-03-2020 08:04PM

listermint wrote: »

Super common practice in the 80s

House built in 2007...

Dats_rite · 27-03-2020 08:11PM

GreeBo wrote: »

6 weeks?

From your second pic I still see damp in the substrate to the left and possibly on the joint to the right....

What floor finish are you going for?

I'd roughly fill with a smix as suggested above and then top off with a self levelling compound to match floor height.

The photo was taken after the leak. Also there is a bit of condensation on the cold supply.....but the leak is fixed, I've been checking every day.

Going for a tile finish. Would you think that filling the hole to finish level.with a sand and cement mix would work?

dodzy · 27-03-2020 08:54PM

Dats_rite wrote: »

The photo was taken after the leak. Also there is a bit of condensation on the cold supply.....but the leak is fixed, I've been checking every day.

Going for a tile finish. Would you think that filling the hole to finish level.with a sand and cement mix would work?

DPM, toss in hardcore to a few inches below ground level and finish off with concrete mix

listermint · 27-03-2020 11:56PM

Dats_rite wrote: »

House built in 2007...

I'd assume then it was lasy Celtic throw it up construction therefore.

Dats_rite · 28-03-2020 09:35AM

listermint wrote: »

I'd assume then it was lasy Celtic throw it up construction therefore.

No dont think so. It was built by the previous owner and he project managed it by getting each trade in, so I dont think it was thrown up.

listermint · 28-03-2020 10:51AM

Dats_rite wrote: »

No dont think so. It was built by the previous owner and he project managed it by getting each trade in, so I dont think it was thrown up.

Self build project managed personally I rest my case.

Dats_rite · 29-03-2020 11:01PM

listermint wrote: »

Self build project managed personally I rest my case.

You rest your case.....without knowing the previous owners experience?

He's a project manager for a construction company road building, windfarm construction and importantly a large house building company. He has managed a few large house build projects.

So probably not a bad self builder if you ask me

listermint · 30-03-2020 08:15AM

Dats_rite wrote: »

You rest your case.....without knowing the previous owners experience?

He's a project manager for a construction company road building, windfarm construction and importantly a large house building company. He has managed a few large house build projects.

So probably not a bad self builder if you ask me

Project managers aren't self builders. He has no conduit under his floor for wiring back to his CU.

Project managers are project managers.

GreeBo · 30-03-2020 09:37AM

Dats_rite wrote: »

You rest your case.....without knowing the previous owners experience?

He's a project manager for a construction company road building, windfarm construction and importantly a large house building company. He has managed a few large house build projects.

So probably not a bad self builder if you ask me

The problem is that, for example, the guy putting in the concrete floor wasnt told to put in conduit and the electrician didnt tell anyone to put in conduit, so now you have no conduit. If you need to run another cable its a total PITA now.

But at least your leak is fixed!

30-03-2020 04:03PM

Where is that earth even going ?
I've wired more than my fair share of houses and never wired one before the floor was poured !!

Fixing Hole in Concrete Floor Following Leak Repair

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