Underslab insulation: Thermofoam
![](https://secure.gravatar.com/avatar/3c192124d3b3bd01442dfb7b2897b51c?s=52&d=https%3A%2F%2Fimages.greenbuildingadvisor.com%2Fapp%2Favatars%2F200x200%2Fd.png&r=g)
Hi
I looking for underslab insulation for my house, was hoping to find used but can’t find any.
This product Thermofoam has come up at a reasonable price for new.
I was just going to use the 2″ as I am not heating the floors.
Anyone see any issues with this insulation?
Specifications attached.
Could this also be used under a garage slab?
Thanks for any input.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part
![](https://www.greenbuildingadvisor.com/app/themes/greenbuildingadvisor/dist/img/modules/detail-library/thumb1.png)
![](https://www.greenbuildingadvisor.com/app/themes/greenbuildingadvisor/dist/img/modules/detail-library/thumb2.png)
Replies
Dave,
The brand of rigid foam you're talking about (Thermofoam) is expanded polystyrene, also known as EPS. You can certainly use this type of rigid foam under a slab, as the brochure from the manufacturer indicates.
For more information, see this article: "Choosing Rigid Foam."