Holes/troughs left after wall removal

longwalks1

We had wider patio doors fitted to our lounge and it meant cutting back the walls by about another 750mm each side. (New joist was installed etc to support opening). This has left troughs in the concrete floor that are about 2" deep, where the bits of wall cut out used to be (hope that makes sense)

What should I use to fill and level them, in prep for new underlay and carpet in the new year please?

Head_The_Ball

I'm no expert but, at a guess, concrete would do the job if the floor is already concrete.

Do it in a few thin layers to minimise the effects of shrinkage. You might need a final self levelling screed on top if the final layer of concrete isn't level with the existing floor.

Someone more knowledgeable may disagree or have a better suggestion.

missile

I would have expected whomever you had to cut back walls and install doors would have levelled the floor.

tony6403

Fill in one go with sharp sand and cement mixed 3:1.
It is possible to get a good finish no need for SLC.

longwalks1

Thanks all, finally getting round to this this weekend. Should i let the sand/cement mix run right up to the frame of the bifold doors?

Ruski

britishboy wrote: »

Thanks all, finally getting round to this this weekend. Should i let the sand/cement mix run right up to the frame of the bifold doors?

yes, you're effectively screeding the 'troughs' and take it to any edges.

Use a dry mix, it should clump together when squeezed in your hand, anything wetter is mortar and will slump while drying out.

Tamp down the mix a bit into your troughs just so the level is just proud on the existing, then 'Rule off' to the same level as your existing floor. A final sweep across with a trowel to bring a bit of moisture to the top, don;t over do it tho.

In a weeks time it'll be ready for your next phase.

HTH

Russ

longwalks1

Thanks Ruski

Last question I promise...

As I only need a small amount, can i hand mix it up in a builders bucket, or will i need a power drill with mixer paddle? (please go easy on me as never done it before)

Thurso_man

Just hand mix it. Make sure it’s well mixed before adding water.

Add a little water mix and then add more if required.

longwalks1

Thurso_man wrote: »

Just hand mix it. Make sure it’s well mixed before adding water.

Add a little water mix and then add more if required.

Thanks Thurso

And quite a dry mix, consistency of say... play doh as opposed to a more runny mix, like a bowl of thick soup?

Kiran

You should be able to ball it up in your hands and it should hold its shape as a rule of thumb

longwalks1

Kiran wrote: »

You should be able to ball it up in your hands and it should hold its shape as a rule of thumb

Thanks Kiran (and others)

We’re having carpet fitted Tuesday so Is there any way I can reduce the drying/setting time please, so it’s ready for Tuesday afternoon? It’s only 2 small areas by the rear doors