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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.

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    • CommentAuthoradamsmith
    • CommentTimeSep 12th 2023
    We have had to change our bifold due to a fault with the doors. To get the doors out we have had to cut back the multifoil that wrapped into the door reveals.

    Now I am not sure how to insulate/ detail this. Above the door there is a flitch plate beam door, thus no stud void for PIR like the rest of the timber frame. For this reason, I am particularly concerned with condensation risk in this area. Even though we don’t have the heating on yet there was already condensation on the back of the multi-foil (lucky the VCL seemed to be doing its job and the timber was dry.)

    There is only about 25mm depth in the reveals, so I am considering 12mm PIR, then 12mm plasterboard. I am also considering removing the multi-foil from the wall above the door and replacing this with 50mm insulation-backed plaster board, and a new VCL?

    Does anyone have any advice on how to insulate door reveals/ heads when there is little space?

    Many Thanks
    Aerogel (e.g. Spacetherm) would give you a higher insulation value, at a much higher cost. We used it for lining the reveals to the ventilation slits in our barn conversion (glazed with small DG units)

    it's a bugger to cut though - it blunts blades quickly, you need plenty of jigsaw blades so you can change the blade after a couple of cuts.
    • CommentAuthortony
    • CommentTimeSep 12th 2023
    Sounds reasonable to me, I would cover a bit of the frame with the reveal lining and maximise insulation

    Do you have multi foil insulation?
    • CommentTimeSep 15th 2023
    Posted By: Dominic Cooneyit's a bugger to cut though
    I've not yet had the pleasure of using aerogel - am amazed to hear it blunts blades, being so light, almost ethereal (I imagine). Could you describe what it's really like? Perhaps it's the board facing that kills blades?
    some comments on this thread:

    It could be the board that blunts the blade. I have offcuts and am happy to send you a piece for your interest. I gave a piece to my mate Gaz, who works on a building site, to show his colleagues - he said they passed it around at brew time like a piece of moon rock.
    It just looks like wool/felt glued to a thin MgO white board backing that cracks easily. When I showed a piece to our plumber he was less amazed.
    You can also get just the aerogel cloth itself, as blankets to wrap over things, or as a sticky-back cloth tape to stick onto cold bridge surfaces.

    It's basically aerated sand dust, so perhaps it's quite abrasive.
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