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sub floor insulation

  • 10-06-2009 8:36pm
    #1
    ELP
    Registered Users, Registered Users 2 Posts: 180 ✭✭


    Just got planning for new house so just starting to plan the design.
    Thinking of going as close passive- super insulated
    My first question is if i am to put 200-300mm of poly-iso in sub floor can i still built concrete blocks for internal walls
    Your advise would be welcomed


Comments

  • #2
    sydthebeat
    Subscribers Posts: 42,172 ✭✭✭✭sydthebeat


    ELP wrote: »
    Just got planning for new house so just starting to plan the design.
    Thinking of going as close passive- super insulated
    My first question is if i am to put 200-300mm of poly-iso in sub floor can i still built concrete blocks for internal walls
    Your advise would be welcomed

    if you are going for a 'super insulated' home, consider using an insulated foundation....

    its pointless putting in a huge amount of insulation under the subfloor if its going to be punctured by thermal bridges at all internal block walls...

    this is what i mean by insulated foundations
    http://www.aerobord.ie/supergrund.html


  • #3
    gman2k
    Registered Users, Registered Users 2 Posts: 4,076 ✭✭✭gman2k


    @ELP, don't forget that your block internal walls have to be built off foundation, not slab.
    That crack went out years ago!

    Unless you are building a raft foundation/ floor slab (which is highly unlikely)
    Have you an engineer on board to design your foundation layout and dimension it for you?


  • #4
    ELP
    Registered Users, Registered Users 2 Posts: 180 ✭✭ELP


    Thanks for replies - it's only outline planning I have received - have a meeting with engineer next week but want to have some sort of plan when I meet him - don't want to end up with something he thinks will do - need to make sure that he is clued in to super insulated and passive ouses and not just basic design - will probably have more stupid questions to ask


  • #5
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    gman2k wrote: »
    Unless you are building a raft foundation/ floor slab (which is highly unlikely)

    This is what syd is saying . I agree with his advice
    gman2k wrote: »
    Have you an engineer on board to design your foundation layout and dimension it for you?

    This is essential - an engineer who is comfortable the the insulated raft concept


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