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Resolving Cold Bridge at the Bottom of Doors

  • 17-11-2011 3:29pm
    #1
    BMD
    Registered Users, Registered Users 2 Posts: 146 ✭✭


    Hi,

    I am looking for some advice on how to overcome a cold bridge in a new build (see the photo attached).

    It look likes the bottom of the door (aluminium strip) is the problem.

    I will be speaking to the manufacturer of the door but I would be grateful for any solutions.


Comments

  • #2
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    Most probably theres no thermal break at the threshold.
    Builders have been f'ing this detail up for years.

    my solution would involve removing door, frame, skirts. architrave etc... and getting a consaw and taking the step out as far as the innerface of the door saddle. Incorpporate verticle strip insulation, stepped dpc, and recast door step.


  • #3
    Carlow52
    Closed Accounts Posts: 2,389 ✭✭✭Carlow52


    check that its not a slight back slope on the step and driving rain coming in under the saddle that is not sealed properly.
    Had this in a new build last week


  • #4
    BMD
    Registered Users, Registered Users 2 Posts: 146 ✭✭BMD


    Syd,

    When you refer to the thermal break, do you think that the builder probably didn't insulate below the door or if he did then he didn't do it properly?


  • #5
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    im saying they probably didnt insulate it.

    usually what they do is put a piece of wood across the threshold at the level of the outer face of the inner block, when pouring the floor slab. What should then happen is that a min of 25mm rigid insulation is placed (with dpc) before the concrete step is cast... but more often than not, this is omitted.


  • #6
    BMD
    Registered Users, Registered Users 2 Posts: 146 ✭✭BMD


    So it looks like I have no insulation under my threshold!!

    In addition to the requirement for a thermal break under the threshold, should there also be a thermal break as part of the threshold design of the door? Is this common or the exception?


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  • #7
    sydthebeat
    Subscribers Posts: 42,171 ✭✭✭✭sydthebeat


    BMD wrote: »
    So it looks like I have no insulation under my threshold!!

    In addition to the requirement for a thermal break under the threshold, should there also be a thermal break as part of the threshold design of the door? Is this common or the exception?

    im not saying anything for definite.

    but its certainly an area i would check out.
    it should be obvious if you remove the door and aluminimum threshold.


  • #8
    BMD
    Registered Users, Registered Users 2 Posts: 146 ✭✭BMD


    thanks Syd...I was hoping to avoid that level of disruption but it doesn't look likely!!


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