• Has building control told you you have to, or are you doing your own research? If you’re using private building control give them a call and double check.

    IIRC big wood joists are weirdly more resistant to fire than steels.

  • building control has told me via the builder. Perhaps it's worth calling building control directly as it'll be a shit (and expensive) job and any chance not to do it.

    I'd at least like it to look good if it takes me 2 weekends, and the test bit I did looks fairly average

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