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Suggestion on Detail to reduce wall\floor junction cold bridge in timber frame

  • 22-10-2008 04:17PM
    #1
    sas
    Registered Users, Registered Users 2 Posts: 1,282 ✭✭✭


    I am considering a timberframe build and have thought of the following as a good way of reducing the cold bridge between the ground floor and the walls. Standard detailing won't cut it because I want to build a passive house (likely certified)

    Assumptions:
    - The sole plate for the timber frame sits on the rising walls at plinth level
    - The finished floor level inside the house will be approx 200 - 220mm above plinth.
    - The floor slab finishes flush with the top of the rising walls i.e. at plinth level

    Could I then place 150mm insulation on top of the floor slab and then screed over that?

    This would mean that there is a 150mm overlap between the walls and the floor insulation.

    Any thoughts on this?


Comments

  • #2
    sydthebeat
    Subscribers, Paid Member Posts: 44,924 ✭✭✭✭sydthebeat


    you need a stepped dpc at walls to prevent ingress of moisture.

    If you have a sole plate on the rising walls, flush with the top of the hardcore, your DPC / Radon membrane will simply be flat across all surfaces. This cant happen.

    also if you have say a 100 x 100 sole plate.. the timber frame will have its own sole plate of say 50mm... therefore your 150mm insulation will not overlap with the wall insulation, just the timbers.

    plus you have the added hassle of forming the work to pour the screed.

    Youd be better off with a more standard dpc detail and then construct a suspended timber floor over the conc subfloor and insulate it to your hearts content. youd have higher floor levels also.


  • #3
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    SAS - no offence , but this may be the first of many many posts like this

    I respectfully suggest you invest in this

    http://www.amazon.co.uk/exec/obidos/ASIN/3211297634


  • #4
    sydthebeat
    Subscribers, Paid Member Posts: 44,924 ✭✭✭✭sydthebeat


    sas email on way to you...


  • #5
    sas
    Registered Users, Registered Users 2 Posts: 1,282 ✭✭✭sas


    sinnerboy wrote: »
    SAS - no offence , but this may be the first of many many posts like this

    I respectfully suggest you invest in this

    http://www.amazon.co.uk/exec/obidos/ASIN/3211297634

    None taken and I already have it.

    Alot of the details however contain references to some materials which I haven't come across in this country. To be honest based on what I've gleaned from that book I'm surprised anyone builds with timber at all. So many of the details make reference to risk of moisture damage etc.

    Incidently, one of the 4 certified passive houses in this country use something very similar to what I've described based on the downloads on their website. I'll pm the link to the interested parties.


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