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Green Building Bible, Fourth Edition
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Housing - New Build: Basement Insulation - inside or outside?

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    • CommentAuthorTriassic
    • CommentTimeDec 22nd 2015 edited
     
    I'm building a basement with 3 sides in the ground and the front opening onto a slope.

    I've talked to a number of companies about insulation and keep getting conflicting advice, one design shows the insulation on the outside of the basement walls and another the insulation is inside.

    I had envisioned a basement built off a Viking House type insulated raft, with the insulation wrapped around and up the outside walls, linking into the a layer of exterior wall insulation on the outside of the timber frame, thus eliminating any cold bridging problems at the junction of the concrete and the TF.

    Thoughts?
    • CommentAuthortony
    • CommentTimeDec 22nd 2015
     
    Outside, with it inside you risk condensation on the structure.

    Also good to design out thermal bridges
    • CommentAuthorTriassic
    • CommentTimeDec 22nd 2015
     
    Thanks Tony, with all the conflicting advice from the various foundation companies, it's good to get some assurance that my original design is correct. Outside it is then.

    Any thoughts on thickness under a basement, the floor of which will be 2.6m below ground level. The current design calls for 200mm of EPS200 and 300 under the slab and the same on the outside walls.
    • CommentAuthortony
    • CommentTimeDec 22nd 2015
     
    Sounds good. I differ from the main stream believing that the ground has insulating properties and once warmed up also reduces delta T again reducing heat losses. U values apply to steady state and to assume that the ground under the house is cold seems wrong as it will in steady state tend towards tea rage temperature of the house.

    I would thin the insulation under the floor certainly t the back and in te middle, re using it to better effect as wing insulation.

    Like I said not main stream thinking.

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