Hi Stuart!
I sent them end of last week! Ah so sorry you haven’t received the email! I also had another couple of questions about the roof makeup... Here is the text:
The outside of the holes measure 435 x 640mm
The free opening space is 345 x 550...
From the outside of one to the outside of the other it measures 3225.
I wonder if it is better to leave the shutter in place, plane the top nice and flat, then use the shutter as part of the sleeve... the silencer could be green glued and fixed to the shuttering, then extend the sleeve inside the shutter into the room?
It would make the installation of the silencers easier and I think the airtightness better... if we remove the shutter then we have a slightly tricky opening to seal...
The questions on structure:
Aside from the silencers which are of course very important, could you answer a specific question regarding the roof makeup...
I have a choice:
System A:
Block and beam (95mm concrete block), vapour membrane, pir insulation then concrete topping which I can liquid rubber finish.
System B:
Block and beam, concrete topping, vapour membrane, pir insulation, ply screwed through to the concrete, then liquid rubber roof.
System A is going to be cheaper and quicker, also no penetration through the insulation but my concern is the outer leaf becomes thinner at the roof level but also possibly more importantly a 3 system overall! It’s inner leaf is massive, middle leaf is medium massive and so is the outer leaf.
System B will be more weather dependant for finishing, cost more and be 3 leaf but probably not considered true 3 leaf. The roof will be more massive...
I’m tempted by System B at present!
My final thought of uncertainty is the sleeves through the outer wall... if they are anything other than 150mm round holes then I’ll need to lintel them (I realised only last night)... we have finished the outer walls now and the roof beams are coming tomorrow.