Outside Denbigh St
Although not all support timbers were rotten, they were all replaced. We used pre-treated timber supported by concrete blocks. Any remaining and visible timber was treated with 'Metalex' - a timber preservative. It is dark green stuff - you can see it here where the timber is darker.

50mm of polystyrene slabs used right around house - toasty!
Concrete lain with underfloor heating elements and a 50mm poly slab
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