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Housing - Renovation: Cost-effective passivhaus walls for loft conversion dormer

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  1.  
    • CommentAuthorShevek
    • CommentTimeJul 15th 2012 edited
     
    For various reasons we've had to switch the construction of our dormer loft conversion from blockwork + EWI to timber frame + cladding. Roof tiles to cheeks and timber to front.

    As I detail everything I've been getting a bit jittery about our budget so I'm looking for a cost-effective build-up. Any thoughts?

    What about (for tiles):
    12.5 mm plasterboard
    19 mm battens/service zone
    9 mm OSB (airtightness layer?)
    140 mm timber + mineral wool
    12 mm OSB
    150 mm EPS
    25 mm counter battens
    25 mm battens
    50 mm (3 x16 mm) plain clay roof tiles

    The 150 mm EPS (or whatever it is will overhang the solid brick party wall)
    • CommentAuthorShevek
    • CommentTimeJul 15th 2012 edited
     
    Actually, come to think of it, do I have a problem with the weight of tiles and the battens being separated from the OSB/studs by 150 of insulation?

    It may have to be:
    12.5 mm plasterboard
    19 mm battens/service zone
    9 mm OSB (airtightness layer?)
    140 mm timber + mineral wool
    12 mm OSB
    75 mm horizontal timber support + 75 mm EPS
    75 mm vertical timber support + 75 mm EPS
    Breather membrane
    25 mm battens
    50 mm (3 x16 mm) plain clay roof tiles
    • CommentAuthortony
    • CommentTimeJul 15th 2012
     
    no fire proof board behind the battens?

    looks nice otherwise.
    • CommentAuthordjh
    • CommentTimeJul 17th 2012
     
    I half-remember something about 9 mm OSB not being a vapour barrier? Why is the 12 mm outside the 9 mm? Can they be switched?
    • CommentAuthorShevek
    • CommentTimeJul 17th 2012 edited
     

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