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bridging
Where are the internal walls / external walls?
Dwarf walls abutting external walls is a great way for damp to rot your joists.
A roll of DPC under them might help.
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Joists under the stairs have seen better days, to say the least
I would say that those joists are terminally fucked and would strongly advise you to replace them if I was working for you. With the amount of rot at the end it is entirely likely that moisture has travelled up the grain and could well be rotting away in the centre so if you leave it as is it is possible that you'll do all this work out a finished surface on top the subfloor and then 6 months to 6 years in the future will have to tear it all up again to replace them. It makes much more sense to get it done now even with the current cost of building material.
anything else I need to worry about here? (they are/were red engineeeing bricks)
Nope looks good. Engineering bricks will retain their strength even when submerged in a sewer 24/7.
Out of curiosity is are those joists ending on an external wall?
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NotThamesWater
Bobbo
@hvsds
Joists under the stairs have seen better days, to say the least.
Quite a few of the bricks supporting the joists have this yellowy efflorescence - I’ve been wiping it off as much as I kind, and cleaning up the sub-floor so there’s minimal/no material bridging in between things - anything else I need to worry about here? (they are/were red engineeeing bricks)
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