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Housing - New Build: passive house foundations

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    Hi All,

    I've just received my copy of the passivhaus-bauteilkatalog its very informative
    Quite a few details note "warm foot" components that act as structural insulation at the base of a load bearing wall. Is it an aircrete type block where you can get down to 0.11W/mk and minimise the cold bridge a little. Or specialist items like marmox / perinsul or schock type blocks. I suspect the latter are expensive when they are required under a 365 durisol block?

    What do the Europeans use here! Your thoughts and views welcome
    • CommentAuthordjh
    • CommentTimeOct 22nd 2012
     
    Sorry, I don't have the book in front of me, but IIRC don't the descriptions associated with the diagrams list the details of the components?
  3.  
    No just description titles:

    Honeycomb brick outside wall, ETICS/slab foundation,insulated upper side, wet screed

    Theres another whats ETICS ?
    • CommentAuthornikhoward
    • CommentTimeOct 22nd 2012
     
    Look at Vikings passive slab founds, others have done similar
  5.  
    We'll build 20 Passive Houses in Ireland this year using the "Passive Slab" foundation system,
    http://www.viking-house.co.uk/passive-slab-insulated-foundations.html
    All going well we'll start 25 Passive Houses in Hollyhead before the end of the year, we usually Solar Heat Passive Houses, this reduces the heating demand from 15kwh/m2.annum to 3kWh/m2.annum and reduces the hot water demand to 3kWh/m2.annum.

    I'm not a fan of the Aircrete block method because their Lambda changes when they get wet, my opinion is biased.
    • CommentAuthordjh
    • CommentTimeOct 23rd 2012
     
    Posted By: neilgorswiftNo just description titles:

    Honeycomb brick outside wall, ETICS/slab foundation,insulated upper side, wet screed

    OK, I have the book now. I think you're looking in the wrong place. I think you're looking at the 'Connections' chapter, at something like AWm 05 - EFo 01. You need to look at the description of the wall and slab separately, in the earlier chapters. So you can find AWm 05 in 'Outside Walls' and it tells you there the 'Usual construction' and the 'Alternative construction'.

    However, I agree it is vague about the 'warm foot'. Possibly it is described somewhere else in the book but I haven't been able to find it. They give a range of lambda values for it from 0.1 to 0.3 W/m.K, so I think its anything the engineer is happy with that gives you enough strength and a low enough lambda. Aerated concrete and foam glass panels get mentioned elsewhere.

    Theres another whats ETICS ?

    Google shows that means 'External Thermal Insulation Composite Systems'. It's the European term for what we call EWI with our glorious 'call it anything as long as its not the same as other Europeans' attitude.

    Posted By: Viking HouseI'm not a fan of the Aircrete block method because their Lambda changes when they get wet, my opinion is biased.

    In this particular detail, the aircrete block, or whatever it is, is inside the DPM. But I do like your foundation slab system!
  7.  
    All,
    I costed the aircrete block, marmox, perinsul and Shoeck Novomur systems. Aircrete comes out the cheapest but i agree with Viking its not the best solution, even when dry as structurally its touch and go.
    Just had a meeting with my engineer and he's comfortable with the raft with eps insulation below slab now so i am off in that direction.

    have had some costs from Atlas and Izodom for their systems - pretty expensive although polish izodom is cheapest but not the neatest edge detail. Thinking Knauf polyfloor may be cheapest to use as it's just simple slab insulation T&G. Anybody got any other value for money solutions?

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