JTaylor91 Posted June 25, 2022 Report Share Posted June 25, 2022 Looking for some advice on a cracked concrete floor. We were planning on getting the kitchen tiled however there’s a big crack on what used to be the dining room side. No other room has any cracks it’s just isolated to this area. Is it a dig it all up job or can it be repaired? The tiler doesn’t like the idea of tiling on it. I believe the old central heating system must of had a leak at some point as all the old pipes that were set in the concrete have been cut and new pipes fitted externally. Could it be that the leak was under the dining room and caused this? Quote Link to comment Share on other sites More sharing options...
ditchman Posted June 25, 2022 Report Share Posted June 25, 2022 am i right in saying one side looks 1/2" lower than the other ? Quote Link to comment Share on other sites More sharing options...
Walker570 Posted June 25, 2022 Report Share Posted June 25, 2022 Ooops, don't like the look of that. Has to have been quite a bit of movement to get a crack that wide. How old is the house? Quote Link to comment Share on other sites More sharing options...
TIGHTCHOKE Posted June 25, 2022 Report Share Posted June 25, 2022 Dig it up and do it properly. Quote Link to comment Share on other sites More sharing options...
JTaylor91 Posted June 25, 2022 Author Report Share Posted June 25, 2022 24 minutes ago, Walker570 said: Ooops, don't like the look of that. Has to have been quite a bit of movement to get a crack that wide. How old is the house? Built mid 80s I believe. What makes me think it isn’t subsidence is the living room next door has zero cracks at all. It’s literally just what was the dining room. I could be wrong though. As Ditchman says the right side does look lower. Quote Link to comment Share on other sites More sharing options...
ditchman Posted June 25, 2022 Report Share Posted June 25, 2022 are there any cracks on the outside walls ? Quote Link to comment Share on other sites More sharing options...
JTaylor91 Posted June 25, 2022 Author Report Share Posted June 25, 2022 4 minutes ago, ditchman said: are there any cracks on the outside walls ? None at all Quote Link to comment Share on other sites More sharing options...
Ultrastu Posted June 25, 2022 Report Share Posted June 25, 2022 Cracks are common in concrete floors in houses and are usually not something to worry about .but those have also shifted level having dropped .which suggests that there is some subsidence or even worse heave going on. I'd have it professionally inspected . Quote Link to comment Share on other sites More sharing options...
ditchman Posted June 25, 2022 Report Share Posted June 25, 2022 11 minutes ago, JTaylor91 said: None at all well thats good news anyway.... im certainaly not a person to advise you....but i would gunthat part of the floor up....have a gander at it see what the make up is.....wacker plate the whole area....then boots and braces...get an electric cement mixer and mix up a load of cement slurry and pour it all over the floor and let it soak in....then lay and screed over new concrete to level ULTRASTU gives good advice Quote Link to comment Share on other sites More sharing options...
JKD Posted June 25, 2022 Report Share Posted June 25, 2022 (edited) I carry out domestic insurance repairs and see this quite often. It may be slight movement to the structure of your building, but only seen on very close inspection, ie hairline cracks. But with the obvious cracks internally, I'd assume any external cracks to be evident also. Could also be a poorly installed sub base beneath the slab ? Is there insulation beneath the slab ? Method of original concrete floor should incorporate insulation beneath and 25mm minimum around the perimeter to cater for expansion and contraction of the slab and surrounding structure. Maybe this is the cause of that cracking ? Again, something I see often ! Edited June 25, 2022 by JKD Quote Link to comment Share on other sites More sharing options...
Fisheruk Posted June 26, 2022 Report Share Posted June 26, 2022 That’s a problem with the fill under the concrete. Your tiler is correct. It’s a dig out and relay IMHO. Quote Link to comment Share on other sites More sharing options...
Mungler Posted June 26, 2022 Report Share Posted June 26, 2022 Are you in a clay area? Having come this far you might as well whack a bit up and have a gander. Report back when you do, I’m intrigued. I’d like £5 on no heave boards and voids wrong. If you do a historic aerial photo search of your gaff, what was there before (have a look at getmapping.com). Quote Link to comment Share on other sites More sharing options...
JTaylor91 Posted June 26, 2022 Author Report Share Posted June 26, 2022 Thanks for the replies everyone. Not in a clay area that I know of the river Trent is about 500m from me though. I’m going to dig it all out and get it re laid. I will add some pictures when it’s up probably be a few weeks. Quote Link to comment Share on other sites More sharing options...
amateur Posted June 26, 2022 Report Share Posted June 26, 2022 I suspect that the underfloor central heating pipe failure may have eroded the soil under the concrete, leaving a void into which your room is falling. I would certainly be excavating it and relaying. Quote Link to comment Share on other sites More sharing options...
ditchman Posted June 26, 2022 Report Share Posted June 26, 2022 1 hour ago, JTaylor91 said: Thanks for the replies everyone. Not in a clay area that I know of the river Trent is about 500m from me though. I’m going to dig it all out and get it re laid. I will add some pictures when it’s up probably be a few weeks. great stuff...........look forward to seeing whatthe prob was.. Quote Link to comment Share on other sites More sharing options...
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