creating thermal door thresholds/upstands on full house renovation

[frslam]

hi, looking for advice for replacing an external door threshold/upstand. Full strip out, floor void filled 75tn type 1, dpm, 100mm c30 with a252 mesh. Will be installing new windows and doors. As is usually the case in Scotland, doors and windows are check revealed. Some point in the 1990's Everest fitted new windows and doors, though the windows are in the check reveals, the doors were brought in line with the inner block leaf instead of the cavity and the cavity was closed on the outside of the building. I want to move the face of the door back out to where it should be - the outer face of the frame meeting the inner face of the external block leaf. the slab is already poured and I will be adding 100mm PIR, UFH and a floor screed. This can be from 50 - 70mm. I'm looking at a few products such as compacfoam, marmox and triotherm. I'd want something thermally efficient which can support the weight of a normal size composite or timber door, but sits on the step which already bridges the cavity. I would rather it didn't protrude so as to show on the inside of the house because I'm hoping to polish the concrete screed. So I'm looking for something that can be used as an upstand and threshold for the door, as shown on the diagram, I plan to cut away the upstand that is there now. Thanks for any tips

[nod]

1 hour ago, frslam said:

hi, looking for advice for replacing an external door threshold/upstand. Full strip out, floor void filled 75tn type 1, dpm, 100mm c30 with a252 mesh. Will be installing new windows and doors. As is usually the case in Scotland, doors and windows are check revealed. Some point in the 1990's Everest fitted new windows and doors, though the windows are in the check reveals, the doors were brought in line with the inner block leaf instead of the cavity and the cavity was closed on the outside of the building. I want to move the face of the door back out to where it should be - the outer face of the frame meeting the inner face of the external block leaf. the slab is already poured and I will be adding 100mm PIR, UFH and a floor screed. This can be from 50 - 70mm. I'm looking at a few products such as compacfoam, marmox and triotherm. I'd want something thermally efficient which can support the weight of a normal size composite or timber door, but sits on the step which already bridges the cavity. I would rather it didn't protrude so as to show on the inside of the house because I'm hoping to polish the concrete screed. So I'm looking for something that can be used as an upstand and threshold for the door, as shown on the diagram, I plan to cut away the upstand that is there now. Thanks for any tips

That’s all I’ve done with ours