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Depth from ground level to top pf pipe = 150mm, bottom of pipe footings = 520mm, yes its a clay pipe.
Bottom of trench = 550 mm that will then match the depth of the existing founds, i was originally going do go down to around 750mm, but now not sure I need to as the extension will be a lot lighter, as it won’t have a concreate slab roof as the existing one does.
Bottom of trench = 550 mm that will then match the depth of the existing founds, i was originally going do go down to around 750mm, but now not sure I need to as the extension will be a lot lighter, as it won’t have a concreate slab roof as the existing one does.