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  • 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)

  • 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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