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    Thermal Brackets for windows & doors  ·  06. June 2022

    How to prevent thermal bridging under doors in retrofit projects

    Nowadays, almost everyone in the building trade knows that thermal bridges must be avoided in new buildings. Interestingly however, this fact is usually neglected when it comes to deep retrofit.

    Yet, especially in renovation projects, care should be taken to minimise thermal bridges when replacing windows and doors. Otherwise a heat pump, as the preferred heat source, cannot heat the building efficiently, because the heat losses become to big for such an efficient heating system.

    What can we expect at door threshold level in existing buildings ?

    No thermal break strategy under door threshold in existing houses is very common in Ireland

    Well, to be honest, this area was completely ignored until a few years ago, as you can see in the photo beside.

     

    Door in, concrete poured against it and tiles on top - job done!

     

    The associated coldness of the floor was considered as standard and often not questioned further.

    What´s wrong by having no thermal break at door threshold level ?

    Same door with a partial overlay_ of thermal imaging from inside
    Typicall threshold detail in a deep retrofit

    As mentioned before, a lack of thermal insulation under the door leads to a clearly noticeable heatloss through thermal bridging. In the specific case, a temperature level, equivalent to the outside air, was measured on the floor surface on the inside of the (locked) door.

    This building had just undergone a deep retrofit for energy saving. Unfortunately, the only change in the threshold detail of the door was, to apply a new layer of external render.

    What is your solution to prevent thermal bridging ?

     

    The Triotherm system has been developed  to minimise thermal bridges around windows and doors.

     

    Triotherm enables full load transfer of windows and doors with a thermal insulation value equivalent to standard mineral wool.

    Triotherm as thermal break for an entrance door, sitting on the subfloor.
    Structural thermal support for a new entrance door, by having Triotherm bolted against the existing floor slab.
    A noticeable reduction of thermal bridging was achieved, by having Triotherm fit under an existing door.
    Shims have been used to level the uneveness of an existing subfloor, when using Triotherm as thermal support bracket.
    The installation of Triotherm can be done in line_ with the door installation, as no major preparation work is required.

    Triotherm can be easily integrated into various existing floor details. For example, it can be bolted onto an existing subfloor or bolted against an existing floor slab. Triotherm can even be used on uneven subfloors by levelling the unevenness with corresponding shims.

    Say "Goodbye" to outdated threshold details !

    No strategy in place to pervent thermal bridging under a new installed door in a deep retrofit with external wall insulation
    To bring a building to nZEB level, it needs more than external wall insulation on visible building areas!
    No need for outdated threshold support strategies when using Triotherm
    Unfortunately even some window suppliers do not have acceptable proposals for threshold support without thermal bridging.
    tagPlaceholderTags: Thermal brackets for windows & doors
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