Yea I've watched a few of them, you do wonder if it's just some baloney or it actually works. There are several UK businesses seemingly offering such services. Google slab lifting or similar.
How to underpin front of concrete slab, that's poorly built on a slope and now overhanging it's hardcore sub-base?
- Thread starter zhelevn
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It definitely works, the question is how long for - especially if you drive a car over or store anything heavy on top of it.
I have a stock room full of literally tons of stuff, all on a floating chipboard floor that's held up only by Celotex. I expected it to have sunk, but I don't think it's budged at all. But squirty foam is a lot weaker.
I have a stock room full of literally tons of stuff, all on a floating chipboard floor that's held up only by Celotex. I expected it to have sunk, but I don't think it's budged at all. But squirty foam is a lot weaker.
I've seen those. There was a time I was even thinking of enclosing it all with bricks or better shuttering. Get a masonary hole saw bit and SDS drill and drill 3 holes from the inside and fill with concrete.
@Ivor I just google cost of concrete filling and check-a-trade gave out £150 a square meter as an average. Maybe that's for filling a house foundation footing that wil obviously be way more volume for the depth.
I'm not spending more than £500-700 on this repair, but something will be better than nothing. However, because of it, I have changed my plans to install mostly modular 2nd fix stuff that can be recovered if it all needs taking down (e.g. PVC tile floor instead of epoxy, surface mounted metal clad sockets instead of building a stud wall and recessing within etc.
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My solution would be similar....
Knock in some short sections of scaffold poles or something similar, a little distance from the base, and as deep as you can possibly get them, then lay concrete fence poles, horizontally resting against, and supported by the poles. Finally, remove those bits of decking boards, and in fill, with a sloppy concrete mix, pushing it just as far under the slab, as you can get it. As a last job, you could chop any protruding tops off the poles.
Knock in some short sections of scaffold poles or something similar, a little distance from the base, and as deep as you can possibly get them, then lay concrete fence poles, horizontally resting against, and supported by the poles. Finally, remove those bits of decking boards, and in fill, with a sloppy concrete mix, pushing it just as far under the slab, as you can get it. As a last job, you could chop any protruding tops off the poles.
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By way of an experiment, and hearing about puncture proofing - I filled a caravan jockey wheel with foam, frustrated by punctures. There is only 70Kg of weight on the jockey wheel. It lasted just an hour or two, before going completely flat.
You do know this is a DIY forum? The clue's in the title.
Smash it out, prepare then get concrete delivered. You'll pay less than £1000, depending on the depth.
If you prefer to sit in your armchair then obviously you'll pay lots more.
I've not looked much into the cost of pouring concrete, but makes sense for check-trade guide prices to be for a the labour as well. Thanks.
Good to know it won't cost too much in a worst case scenario!
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