Any thoughts on Amvic Ampex (radiant slab insulation)

Richard Miller

I am doing my own 40x70 house/shop, slab on grade in southern Missouri. A local contractor has offered to sell me Amivix Ampex for $1.65 per sq. ft. I’m tempted to go with this… Anyone have any experience with it?

1. Is it a good product?

2. Can I depend on the built-in vapor barrier? Or should I put one underneath too?

3. Pros/Cons?

I’m all ears.

hot_rod

The worse place for radiant tube is the very bottom of the slab. Surrounded by foam nubs costs you even more heat transfer. I did some testing with the foam nub board, it came out very close to what Siggy modeled.

Spend the time to elevate the tube into the slab, 2" below the surface if possible.

Here is how I detailed my shop tube. 6" OC for lowest SWT, heavy gauge sheet mesh elevated with small pieces of foam.