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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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    • CommentAuthorconverse
    • CommentTimeNov 11th 2020
    I am sure i have read somewhere about an approach to insulation from heat losses to the ground where the perimeter of the building is insulated vertically, but the floor slab itself is a large deep heat sink type construction laid on top of a damp proof membrane, without insulation. I'm sure it was a thread on here but can't find it. I have a site with a lot of spare crushed concrete to use, and also a need to build the levels up significantly, so i wanted to read up on this. Cant find anything on it so am starting to think I imagined it.
    • CommentAuthorEd Davies
    • CommentTimeNov 11th 2020
    No, you didn't imagine it, that sort of thing's been discussed here often. Search engine fodder which might help: “perimeter insulation”, “umbrella”.

    Not sure it'd be my first choice of a new build, though.
    • CommentAuthorconverse
    • CommentTimeNov 11th 2020
    Great, found the mammoth thermal store thread. Thanks
    • CommentTimeNov 11th 2020
    try 'downstand perimeter'.
    • CommentTimeNov 11th 2020
    I have a suspicion you might have problems convincing a BCO it meets regs?
    • CommentAuthorjms452
    • CommentTime1 day ago
    Posted By: converseneed to build the levels up significantly.

    300+mm of polystyrene plus a concerete slab will help build up your levels - you normally have to go down to get a good level of floor insulation.

    Crushed concrete might be able to be reused as a bottom layer of sub base for your drive...
    • CommentAuthorbxman
    • CommentTime18 hours ago
    Heat loss is directly proportional to the Delta and heat losses through the floor are insignificant apart from at the perimeter when the exterior walls are not insulated on their exterior.

    To my mind that insulation would be better used elsewhere. if you can incorporate EWI you will get some thermal mass which will stand you in good stead.
    • CommentAuthordereke
    • CommentTime16 hours ago edited
    I've been wondering about doing this in my house. I've been insulating under the suspended floor but it is a pain in the arse to do and the part I've started with is the easiest as there is a roomy 600mm of clearance. It is less elsewhere.

    I'm thinking of ripping all the floors out (they are not fixed to the walls, like piers in the middle holding it all up) laying down insulation on the ground and walls then infilling with hardcore and putting a screed and underfloor heating in. I think the thermal mass would be useful for getting the most out of my heating system and also switching to an agile tariff (turning off the heating for a few hours at peak time should not have a big impact).

    Hell of an upheaval though. Please don't mention it to my wife!
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