He is saying your post has subsided like your footings.
Digging alongside neighbour's foundation
- Thread starter paulweller84
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He is saying your post has subsided like your footings.
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Leofric
Thank you , but no sign of subsidence on my house and the adjoining extension was built several years ago now.
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woody's a dab hand with paint nowadays!
did take me a minute to get it as well
And no our footings weren't floating with nothing directly below, they were just visible well above the bottom of the trench. The original house doesn't have any concrete just a few bricks laid on the clay.
did take me a minute to get it as wellAnd no our footings weren't floating with nothing directly below, they were just visible well above the bottom of the trench. The original house doesn't have any concrete just a few bricks laid on the clay.
When we had our extension built in a similar fashion our Building control inspector made us go deeper than our next door neighbour's footings by over half a meter and "scoop" out soil underneath their footings (single story) and fill in with Concrete. That was in 2002 and we live on a hill our house is further down it.
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Leofric
Leaving the smart remarks aside for a moment if that is possible, assuming the ground is level and there are no unusual ground conditions what else would anybody propose apart from making the new strip foundations at the same level as the adjoining existing concrete foundations
We ours done 5 months ago, 1 side was dug next to the neighbours (their extension 3m, mine 4.5m) at a depth of 1.3m, their foundations were 1m in size and they only had 2 courses of DPC bricks, our foundations went deeper with at least least 11 courses, my trench was exposed for over 5 days as well.
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Leofric
Thanks for all the replies. I have since spoken with a very experienced builder who said as long as we're not digging lower than or under, to just crack on with it but don't leave it open for any long period. The risks come when you take support from under the existing foundation, not alongside.
Somebody posted a picture a couple of years ago of a neighbours house that collapsed into the trench of the neighbouring property's extension.
It may have been this house:
https://www.stonespecialist.com/new...-after-extension-foundations-cause-neighbours
Yes I think that's it.
Interestingly, they blamed the method we are talking about as the cause.
However, looking at the age of the house, it may not have very deep foundations
However, looking at the age of the house, it may not have very deep foundations
I think also the major difference here (as well as potentially shallower footings) is that this is a very heavy two storey building, and what I'm digging next to is supporting a single wall forming the side of a timber conservatory. The weight difference between these two is vast.
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Leofric
Not altogether clear what they did, the article mentions the foundations were at the same depth and then goes on to mention undermining and underpinning
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