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Polygon
@TheShipwright
@Silly_Savage
I think you could get away with the bolting the new joist to the joists at either side of the f/p. Obviously you're putting more weight on these two joists but I'm guessing it's not gonna be high traffic area. Re the timber treating, it depends on the air gap and contact (if any) with the leftover base material. I don't think it would be wise to have any wood in contact with the base directly but if it makes contact or is seated on it then some sort of membrane to stop damp transfer. If there's no contact then a decent air gap is best to allow air flow. With a decent air flow I don't think you need treated timbers, the originals wouldn't have been treated and they've lasted OK.