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4 inch gap between concrete slab and external walls
Hello all,
Hoping you can help - there seems to be a 4 inch/10cm gap in my house between the concrete slab foundation and the external walls. The slab is screeded over but the screed is in poor condition so before repairing it we have started taking out loose bits of concrete.
It is very apparent where the hollow gap is under the screed because of the distinct crack all along the perimeter of the property.
I searched for expansion gap but nowhere does it say it should be this big. It is literally filled with dry rubble and dust. The house is a detached cavity wall construction from 1972.
Could anyone suggest what the gap is for and how/whether to fill it?
I posted on another forum with photos, https://www.diydoctor.org.uk/forums/4-inch-gap-between-concrete-slab-and-external-walls-t52547.html
Many thanks and best regards
Julia
4的答案从MyBuilder Groundworkers
Best Answer
The gap is where your cavity goes around your whole house. But because we put doors and patio doors in we need to bridge that gap so we will it with concrete. But it should be done a lot better than that.
Answered 22nd Oct 2021
Hi,
Having seen the picture i misunderstood, but Buddys property services have provided a good answer.
Best of luck,
Adam
Answered 22nd Oct 2021
Quick fix a bit of concrete but the floor looks like a very poor mix so one day the whole floor will need replacing
Answered 23rd Oct 2021
When you build up to doc you should leave 2coarses down where doors go to allow enough insulation and screed
Answered 17th Nov 2021
