Groundwork & Foundations Question

Possible subsidence?!?

Our house, 1984 bungalow on clay soil, and the bungalow two doors down is resting on a 'slap heap' and has been underpinned aswell as other neighbours having subsidence remedial work in the late 90's. We had a few cracks before, but always put them down to some building work from 2003, although recently over the last 3 months we have started to see some more cracks start appearing. In all of the rooms we have cracks about 1.5mm wide in the ceilings, we have got skirting boards coming away from the wall by about 2/3mm, old style door frames with glass top having cracks appear in the corners of it that are about 2mm wide. In our internal garage we have cracks about 5mm wide along the join between ceiling and outer wall and a large crack that goes from floor to ceiling in the middle of the outer garage wall right behind the consumer unit, which now is also at an angle and no longer straight. On the front of the property we have a tiled clad area, there is now a gap appealing between this and the soffits of about 7mm.

Does this sound like subsidence, or is it an over exaggeration on our part?

2 Answers

chances are given the area and ground conditions and other properties affected then yes ,trial holes will confirm this

Answered 20th Feb 2012

substructure

Member since 7 Jun 2008

It is important to know the geology, ground conditions and the depth of existing foundations to appreciate the problem. The recommended depth of foundations in clay is governed by what is called Plasticity Index of the soil. Is unlikely though the problem is being caused by subsidence as clay soils are not usually prone to this phenomenon.

Answered 25th Feb 2012

AVZ GeoEng

Member since 24 Feb 2012

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