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I think I have got my head round the principles of putting the first floor in its place (is that a pun?). I have read the relevant guidance (The POSI Joist Handbook) - and see architects note top left below. I have also read the architects note (bottom -right) which shows me I need to use 200 by 50 treated softwood. Here's our first floor And here's how Durisol recommend I attach the wall plate to the wall So far so good. POSI say I must use a hanger (and the architect says so too) because of air-tightness, and that means I need to..... make sure the fixing for the hanger doesn't penetrate the wall (and so compromise air-tightness) or put air-tightness tape over the masonry hanger fixing. Hanger - to wall-plate: I have a strong feeling I can't get away with 50mm screws for the connection between the hanger and the wall plate can I? What size will those screws need to be? Wall-Plate to wall: Self tapping M10 coach bolts at 400mm centers (architects note above) to attach the wall-plate to the wall? The key thing is that they connect with the concrete isn't it, even if the 400 mm centers guidance happens to fall outside the concrete core (i.e. into the 'wood' of the Durisol block? I think I'll probably need to embed the wall-plate fixing in resin won't I - for air-tightness?
