How do you build a thermal break on a concrete slab floor at the door threshold?


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? 



Responses (2)

Shaun B
Shaun B Sept. 17, 2020, 10:27 a.m.

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?