im building an extension and my depth of footing will be 900mm in clay. the existing house footing is only 400mm also in solid clay i was wondering do i have to dig under existing footing and fill with conc or just go up to it cheers
footings
- Thread starter mark40567
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most bco's in Staffs require a slight underdig, providing an underpin to the existing.
The BCOs around here don't.
You would only be asked to do it if the existing is a traditional stepped brick footing, in which case the ground under the step is removed to take the new foundation plumb with the external face of the existing building.
You would only be asked to do it if the existing is a traditional stepped brick footing, in which case the ground under the step is removed to take the new foundation plumb with the external face of the existing building.
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