Green Building Bible, Fourth Edition |
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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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Posted By: Nick Parsons
(By the way, is that blue strip on the Velux the 'insulating collar'? At very least you should infill between the back edge of the PIR and the collar with insulation. I keep a sheet of 12mm Celotex for such eventualities. It is available online in singles, but the carriage is far more than the board cost, so remember to order a sheet when you have a big order going in!
Posted By: modernvictorianThanks. Just talked this through with the builder (who thinks I'm a bit crazy). He was OK with taping the insulation joints with foil tape but looked blank when I asked about filling any gaps with foam. Basically because the whole surface will/should be airtight in any case with the VCL. I might be a bit confused too - when does a 'joint' become a gap? In other words why is it OK not to tape the joints but not OK leave a small gap'?
Posted By: wookeyGreen Building Store (IIRC) have a presentation showing how much 2mm gaps in insulation reduce the overall U-value. It's significant. Builders seem to be congenitally incapable of caring about this stuff. A quick bit of therm modelling would probably illustrate the point.
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