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 Post subject: Party Wall Underpinning
PostPosted: Mon Jun 04, 2018 9:57 pm 
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Hi all, firstly I would point out that we have full planning, a party wall agreement signed and will be discussing the plan with local council building control, but I would like to go to them with a decent idea of what I'm doing! Also my structural engineer is working out steels etc but does not cover specialist foundations.

I am building a 2 storey extension and as part of this we will have to underpin the party wall which is assumed (by measurements and drilling to be) 9" solid brick. We will be building an independent block wall internally which will be load bearing for the new 1st floor joists and the roof.

Its a 4m section of party wall that will need underpinning. Plan is to dig out in bays 0-1m and 2-3m first and 'tunnel' half way under the existing concrete (creating a 400mm wide footing for new 100mm block wall) rebar into the clay of adjacent bays then concrete these bays and after 48 do the other bays, joining the rebar. I have exposed a section of footing at the back of the house and will presume this is the same for the party wall (for the purpose of these plans)

Please see attached drawings! If anyone can comment on these would be appreciated - is this the sort of thing BC will expect? Am I in the right ball park for design and method?

I've just noticed some missing detail - existing footing is 250 below ground and 250 thick and I've been told dig the normal cavity wall footings to 1m.

Cheers


Attachments:
File comment: 3d proposed footing
3d view footing.pdf [174.77 KiB]
Downloaded 23 times
File comment: cross section of proposed footing
cross section footing.pdf [118.01 KiB]
Downloaded 22 times
File comment: plan view of proposed extension
plan view.png
plan view.png [ 79.51 KiB | Viewed 507 times ]
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