** UPDATE **
Apparently I can use bitumen.
I have a Steel box section column bolted to my trench fill footings via a plate and 4 through bolts. This column is sat between the two skins of...
Got in touch with local water board who consulted map of sewers. All sorted.
I'm planning a single story house extension, the footings of which cross over a 150mm foul water drain (somewhere). I've examined both ends of the...
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