How do you build a thermal break on a concrete slab floor at the door threshold?
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What is a thermal break solution at a door threshold?
Shaun B
Sept. 13, 2020Last updated: Sept. 17, 2020
I am building a net zero home with ICF blocks serving as a frost wall. Our exterior above grade walls will also be ICF with the addition of 3.5" of EPS panels on the exterior. We will have a concrete slab floor.
What is the best method to support very heavy sliding doors and eliminate thermal bridging? I really like the Legalett Thermasill product, but it looks to have a proprietary design that only fits with their slab on grade system. Is there a similar product that can be used as a threshold to not only support the weight of the sliders but also be tough enough to act as a threshold on the exterior on the house?
Thanks,
Shaun
The Legalett Thermalsill insulated door sill for slab on grade floors is only available with Legalett-designed slabs unfortunately. It is a proprietary design that was created as a solution for Passive House slabs, and I honestly don’t know of any other commercially available product. Sorry about that Shaun!
I'm a little surprised that a solution isn't available as this must be a common issue for those trying to build to passive house or net zero standards. Are there any readers out there that have any insight that might help me? I know there was a product by Compacfoam, but this doesn't seem available in my area. Seems like a relatively easy solution. Perhaps a product from Nexcem/Durisol?
Thanks