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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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    • CommentAuthoraiazas
    • CommentTimeJan 17th 2019
    Hi, I'm renovating a 1980s home with concrete on the ground floor, and with limited height (so I can't add much thickness for the insulation). I'm considering aerogel floor slabs (to be covered with 14mm engineered wood flooring finish; I found some by Thermablok).
    Does anyone have experience using this insulation material? I've read somewhere that it can be dusty? Any other suggestions? I've considered PIR slabs (less insulating capacity for the same thickness) and rigid vacuum insulation panels (too many times more expensive), so the aerogel seems like a good mid way, but I haven't been able to find much info from users.
    Thanks in advance!
    Someone on here either used or proposed using it in a floor application - a long time ago. Have you tried a search? I'll see if I can find anything.
    Have a look at 'cbatjesmond's comments on p.3 of this thread:

    • CommentAuthorRobL
    • CommentTimeJan 17th 2019
    I've used aerogel - just in a small thin door panel, where it performs well at raising the internal temperature & preventing mould. It was dusty - wear a face mask !
    If you have a solid concrete floor, then the u value as stands is complicated - most heat goes out of the edges, and so it depends on the shape & size of the building as to what the overall floor U value is. It's worth calculating, to make sure that the insulation you apply makes a useful difference, or brings you to a target value.

    link here to floor U value: http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8403

    The IP 3/90 formula is:

    U = 0.05 + 1.65(P/A) - 0.6(P/A)²


    U = U-Value of the uninsulated floor (W/m²K).

    P = Length of the exposed perimeter (m).

    A = Area of the floor (m²)
    • CommentAuthortony
    • CommentTimeJan 17th 2019
    Mike used itband didn’t like it, but his was on floorboards, he reckons it would all drain through the cracks eventually.

    I would do perimeter insulation down to the concrete foundation using say 150mm of eps all round the house but then I would do cavity fill and EWI too
    • CommentTimeJan 17th 2019
    We have done many rounds and types of aerogel eg:


    But none of it underfoot.

    I think Chris Benson's experience was that it worked but generated huge amounts of dust, but I can't see that right now:



    • CommentAuthorJC48
    • CommentTimeJan 17th 2019 edited
    Hi, I used is to isolate/ insulate a steel frame . I have 4 new sheets 720mm by 720mm by 20mm thick if anyone is interested in buying them as they are surplus
    • CommentAuthorCWatters
    • CommentTimeJan 18th 2019 edited
    I note that they do two versions:

    Thermablok Aerogel ThermaSlim IFI Board
    Internal Floor Insulation (IFI) Board

    Thermablok Aerogel ThermaSlim Impact IFI
    Internal Floor Insulation (IFI) Impact Panel

    Not 100% sure of the difference but if one can be used without a screed on top then you could use a much greater thickness or perhaps in combination with a layer of PIR.
    • CommentAuthorSprocket
    • CommentTimeJan 23rd 2019
    We used it below kitchen boarded floor over a concrete subfloor. It worked well to stop a large area of cold bridging.

    This was a small kitchen where half the floor was over a ventilated void and half directly over (resting on) a solid concrete subfloor block. The ventilated part got regular insulation board below but there was no room for this on the concrete side.

    Lifting the whole floor by about 12mm and putting a thin sheet of aerogel+board over the concrete below the final floor surface dealt nicely with the way the floor had always felt icy cold before.
    • CommentAuthoraiazas
    • CommentTimeJan 25th 2019
    Thanks a lot for all the comments!
    I'm still investigating. Aerogel turns to be quite expensive too, but given it's under engineered wood, they also recommend to use blanket rather than the floorboards (blanket comes covered in double foil, so should minimise dust escape). Now I'm considering a mix of both aerogel blanket and PIR slabs to get a good balance between U-value, thickness & cost.
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