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by zedox
Sun Aug 30, 2020 11:20 pm
Forum: Builders and Builders Merchants Forum
Topic: Replacing concrete slab due to damp in floor and walls
Replies: 8
Views: 2572

Re: Replacing concrete slab due to damp in floor and walls

Thanks!
Should I be concerned that the top level of the floor covering concrete oversite will finish below the external ground level?
by zedox
Sat Aug 29, 2020 6:36 pm
Forum: Builders and Builders Merchants Forum
Topic: Replacing concrete slab due to damp in floor and walls
Replies: 8
Views: 2572

Re: Replacing concrete slab due to damp in floor and walls

Hi zedox If the room the other side of "the opposite wall" is on a suspended floor this should provide adequate ventilation. Probably better not to dig lower than the bottom of the foundations, you can use face fix joist hangers if there is not enough width on the existing foundations for...
by zedox
Fri Aug 28, 2020 10:34 pm
Forum: Builders and Builders Merchants Forum
Topic: Replacing concrete slab due to damp in floor and walls
Replies: 8
Views: 2572

Re: Replacing concrete slab due to damp in floor and walls

We can only install airbricks on one side which is external facing. But could leave a small gap in the floor along the opposite wall to promote air flow. We’ve dug down about 35cm so far from the DPC and are now at the bottom of the wall footings. Great tip on the sleeper wall. Can use smaller timbe...
by zedox
Fri Aug 28, 2020 9:05 pm
Forum: Builders and Builders Merchants Forum
Topic: Replacing concrete slab due to damp in floor and walls
Replies: 8
Views: 2572

Re: Replacing concrete slab due to damp in floor and walls

Hi zedox A key element of a suspended floor will be whether you can ventilate the void. If you can instal air bricks on two sides then a depth of around 500mm below floor level will be more than enough. You will have to build sleeper walls on foundations on each side and incorporate a DPC on each o...
by zedox
Sat Aug 22, 2020 4:02 pm
Forum: Builders and Builders Merchants Forum
Topic: Replacing concrete slab due to damp in floor and walls
Replies: 8
Views: 2572

Replacing concrete slab due to damp in floor and walls

Our house was built in the 1900s, with an extension added in 1990s. We've recently relocated our kitchen to the extension and are now renovating the old kitchen to become a downstairs WC and utility room. The "old kitchen" is suffering from damp in the walls and concrete slab. The concrete...
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