I'm looking to compile a list of manufacturers who are accessible to customers in the United States and provide a product to aid in the construction of super insulated slab foundations. The product would provide substantial insulation on 5 out of the 6 sides of a slab foundation, in other words only the top face would be exposed. This would be accomplished by placing a number of foam forms (similar to ICF) into an arrangement as such that you can then pour concrete on to form your slab. I have found many manufacturer but it appears as if the majority are located in other parts of the world and not accessible to purchase in the United States. I have found two products that match so far, "Raft Therm" https://www.castleforms.com/products/raft-therm/ and "Geo Slab" by http://www.legalett.ca/ Does anyone know of any others so I can weigh their pros and cons and make the best informed decision about what products are available and which to use? Thank you for your time and have a wonderful day!

Basically google "Insulated raft slab" and that should bring up most of what you're looking for.

Thank you, I searched many hours for 'insulated raft foundation' and was only presented with manufacturers unavailable to customers in the united states. Was hoping someone could post a few links for manufacturers available in the states.

I thought it was called a "Rat slab"

No, a rat slab is basically a thin slab in a crawlspace meant, primarily, to keep burrowing vermin out of the crawlspace.

Also, while it may be difficult to buy premade slab kits in the US, they're not horrifically difficult to build from scratch either.
Just remember proper staking and bracing around the edges, overlapping layers and you'll probably want some sort of foam-friendly adhesive to bind everything together once you've got the form perfect.

Also, there's nothing to say your couldn't jerry-rig a system using the concrete flooring systems from any of a number of ICF systems either.

You just need to do proper site-prep.


That said:

https://www.ecocor.us/foundations

http://legalett.ca/

https://bygghouse.com/warmform-slab-forms/

I was just thinking how about using QuadDeck for a complete foundation layer
https://www.quadlock.com/ICF-Floors-and-Roofs/quad-deck.htm
12-1/2" panel thickness with 5-1/2" of concrete on top.

If an ICF wall system was used directly on top of the slab then the first layer of block could have it's inner layer of insulation trimmed up 5-1/2" to allow the outer layer of insulation to touch down onto the foundations insulation to complete the insulation envelope.

I'm curious on how to add termite protection to such a design? I live in an extremely termite ridden part of the country.

Basically you'd need to put down a layer of poly anyhow.

http://www.polyguardproducts.com/wp-content/uploads/2018/04/TERM-Water-Termite-Barrier-Concrete-R4-19-18.pdf

As for using QuadDeck, talk with a soil engineer, as well as a regular construction engineer.
Remember that this flooring method produces concrete T-beams. And that may affect ground pressure, point loads and settling.

Also understand, because of the T-beams, you won't get full insulation value under the verticals, as there is simply less insulation there.