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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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    Hi all

    I've already got vermiculite in the loft, but only to 100mm or so (varies quite a lot)... I'm currently reboarding beneath my header tank and got a few other jobs to do up there, but will soon want to add additional insulation.

    Does anyone know how vermiculite performs compared to the usual suspects? I've had a quick look online and come up with nothing so far. It would be really helpful to know so that I can decide what else to add up there, where to put what, etc.

    Obviously - given the forum - there are bonus points for green recommendations :)

    Many thanks for reading
    • CommentAuthortony
    • CommentTimeNov 24th 2021
    Leave it but respread it out to an even thickness, ideally to top of ceiling joists.

    I would replace first 300 or 600mm at the eaves with quilt as vermiculite is prone to get blown around

    If it was my loft I would add a further 300mm of quilt on top of it
    • CommentTimeNov 24th 2021
    Posted By: greenfingerDoes anyone know how vermiculite performs compared to the usual suspects?

    Google says the lambda of vermiculite is about 0.068 [W/m.k]. That compares with about 0.033 for rockwool or glass wool so about twice as bad. PUR/PIR and phenolic are around 0.022 or so and aerogel about 0.013. Which goes a long way to explaining why the various 'wools' are used as loft insulation, especially given the difference in prices and that wools can be shipped compressed. Warmcel et al is just under 0.04 and can be bought for DIY loose lay.
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