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@rodabod
Extension progress. Old extension now demolished. New extension has broadly similar dimensions as original. Foundations set in concrete around 1m deep. Soil pipe replaced as it was leaking. Loads of roots growing towards it as it was damp, but they weren't the cause. As it's a solid floor, it's been taken down a couple of feet. We've had an air brick installed (see 4" brown pipe) to help ventilate the dining room sub-floor as it has some signs of damp). This will be levelled and tiled. End wall will have a large casement window and sloping roof will have a large velux.
Bricks are laid out on foundations just to show roughly where they'll go. Engineering bricks for first few courses (will add DPC too) Danish bricks on outside skin to match existing, 100mm cavity, then blockwork on the inside. Fairly standard.