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** 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 the interior/exterior wall, built up to DPC and back filled. Should I have coated the column to prevent rotting? If so, what with? BI recommended...

Got in touch with local water board who consulted map of sewers. All sorted. Cheers.

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 run of drain via inspection chambers. Weird thing is the drain out of the first chamber isn't pointing to the second chamber! ie. pipe doesn't seem...