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PostPosted: Mon Oct 08, 2018 10:16 pm 
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Hi there,

I need some help figuring out how to repair a patch of sinking floor in front of what I presume is bricked up fireplace on the ground floor of our house.

We live in a typical old London 2 bedroom terrace (with the ground floor floorboards raised about 6 inches from the ground). We put in new flooring on top of the floorboards when we moved in 5 years ago (click together engineered wood). Recently a patch of floor (90cm x 35cm) against one of the ground floor walls started sinking a couple of inches or so whenever someone stood on it.

I took up what little flooring I could without having a circular saw to see what was underneath and found pieces of a crumbled concrete slab (which is damp and can be broken by hand with a bit of effort) I'm presuming this is a broken up fireplace hearth. I've found one old photo of part of the affected area before we put the floor in and it seems that someone had placed a large wood board over this crumbled concrete which is why we didn't notice it at the time and presumably this board has now also cracked/fallen.

We need to get the patch of sinking floor supported but I'm unsure of what support we would need for the wall? (I'd assume it needs at least a wooden joist? Though there doesn't seem to have been anything at all under the broken up slab). I literally have no idea what/if any support is needed so any advice would be gratefully appreciated.

Many thanks,


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PostPosted: Tue Oct 09, 2018 3:47 pm 
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Sounds like damp damaged joists, whats the air brick situation and ventilation under the floor?
You would have to lift some flooring and expose whatever it is under the hearth and then take pics.

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