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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthorBluemoon
    • CommentTimeJun 12th 2007 edited
    The load-bearing wall between my hallway and my integral double garage is of 100mm dense concrete block. It should have been 150mm Celcon but the apparently the builder didn't have any to hand. To insulate it ready for the sale in a year or two's time, I thought of fixing timber studs to the wall, filling the voids with polystyrene foam then cladding with 11mm OSB with white paint finish. What thickness of foam would be enough, or should I use something else? The other walls are insulated, inner leaf Celcon 130mm, the ceiling is of TACfire sheets nailed to timber joists. The garage, like most, is used as a store room not a vehicle store.
    • CommentAuthortony
    • CommentTimeJun 12th 2007
    Before you insulate the wall you should insulate the ceiling and ensure that it is airtight too.

    Wall would be better not to use wood panels If it were mine i would go for 150mm of batts then plasterboard.
    • CommentAuthorBluemoon
    • CommentTimeJun 12th 2007
    There is 100mm of Rockwool on top of the ceiling between the joists. I realised afterwards that it would have been better to support it under the floorboards, but short of completely filling the voids with a blown product or taking down the Tacfire to push the rockwool up with a shelf of some sort, it can't be done.
    • CommentAuthortony
    • CommentTimeJun 12th 2007
    The problem with 100mm above the ceiling is that in all likelihood it is not doing any insulating. This is because there will be air infiltration from outside above the insulation effectively reducing the temperature on windy days to outside ones below your floorboard and on other days it will be cold under there and chilly.
    • CommentAuthorBluemoon
    • CommentTimeJun 13th 2007
    Looking at your comments on the ceiling, I could take down the Tacfire sheets, fit thin OSB to support the rockwool against the floorboards, then refit the Tacfire.
    • CommentAuthortony
    • CommentTimeJun 13th 2007
    yes, though you could also use netting to hold up the quilt more cheaply ,simply staple the netting to the joists?
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