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Housing - New Build: Foundation timber frame junction insulation

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    • CommentAuthorTriassic
    • CommentTimeFeb 19th 2017 edited
     
    I had been considering an insulated raft foundation, but the slope of the land has pushed us down strip foundations and blockwork, three sides of which will act as a retaining wall for the sloping ground.

    What options do I have for insulating the cold junction between the top of the foundation wall and the sole plate of the timber frame?
    • CommentAuthortony
    • CommentTimeFeb 19th 2017
     
    I. Would add as much insulation across the join ad you can, 100mm eps would be nice and 300mm above and below dpc, with the breather membrane running down and over it, chamfer top edge.
    •  
      CommentAuthordjh
    • CommentTimeFeb 19th 2017
     
    Posted By: TriassicI had been considering an insulated raft foundation, but the slope of the land has pushed us down strip foundations and blockwork, three sides of which will act as a retaining wall for the sloping ground.

    You mean the house will be raised out of the ground on one side, with a crawlspace dug out underneath? I'm having trouble visualising why you would do that or what else you could mean. Maybe a drawing would help?

    What options do I have for insulating the cold junction between the top of the foundation wall and the sole plate of the timber frame?

    Where is the ground floor and what construction are you proposing?
    • CommentAuthorgyrogear
    • CommentTimeFeb 19th 2017 edited
     
    .
    • CommentAuthorTriassic
    • CommentTimeFeb 20th 2017
     
    The ground slopes from front to back of the house, so a slab foundation would be difficult, so the SE has proposed strip foundations and foundation blocks to get out of the ground, with a suspended floor to create the ground floor. At the front, the crawl space would be about 1.2 m deep and maybe a few hundred mm deep at the back.
    • CommentAuthorowlman
    • CommentTimeFeb 20th 2017
     
    I had a similar situation when I built my own place albeit not quite as big a difference as yours.
    Construction techniques aside, I'm sure there are a few different solutions, I opted for a stepped slab creating a split level interior following the site slope.
    Now 30+ years on I don't regret that decision as design wise it made for a nice, interesting interior. We built a large interior, " gable end " type wall and made it a feature, in order to partially mask differing ceiling heights but left some ceilings on the "upper " end with an extra high ceiling which I still like.
    •  
      CommentAuthordjh
    • CommentTimeFeb 20th 2017
     
    Foamglas or Marmox blocks on top of the block wall. Slab or beam and block floor on top of that and timber frame sat on the edge of the floor. Insulation up the outside of the blockwork, joining the insulation in the timber frame. Insulation both above and below the floor, with a screed on top. Detail AWI 05 - KDb 01.

    I'd be tempted instead to level the area of the house then just put a passive slab on top. Much simpler.
    • CommentAuthorgyrogear
    • CommentTimeFeb 20th 2017 edited
     
    Posted By: owlmanI opted for a stepped slab creating a split level interior following the site slope.


    +1 sounds nice !

    "my house" also (1983) presented the same problem as OP, and the result was a crawlspace.
    Which promptly became a heat absorption gulf due to insufficient insulation of slab therefore infloor radiant (electric) warming CS by +2°C for 8 months a year over 30 years...

    Until I decided to "try & turn the CS to good effect" by heavily insulating it, and adding solar heat and interseasonal store...

    In "subjective hindsight", I would avoid a crawlspace at all costs, even if it means seeking any other engineering, architectural or financial solution...

    ("where there's a hill, there's a way")

    gg

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