Tech Lightweight Concrete

These are the only gypsum concrete products you can use with radiant heat. A heat inhibitor is used so the Gypsum concrete does not break down over time. Do not allow a contractor to do an installation without using one of these three products.
Accu-Crete™ is a registered trademark of Allied Marketing and Allied Custom […]

AccuCrete Radiant has a PSI rating of 2500 to 3800.
Hacker Gyp-span Radiant has a PSI rating of 1800 to 2500.
Maxxon Therma-Floor has a PSI rating of 1600-2500.

These are two different products. Lightweight concrete has no R-value because of the amount of aggregate, therefore it is not very strong.

If cracking is a problem we come back and fill the cracks with a high psi polymer fill.

We have had 95% success in avoiding cracks by using:

Water reducers
Fibermesh in concrete
Crack control methods
Proper hydration time (sealing the concrete)

Lightweight concrete is susceptible to cracking. Because of the potential of lightweight concrete to crack over a wood substraight we recommend our Gypsum concrete when planning on using tile or engineered hardwoods as the majority of your floor coverings. Gypsum concrete is a self leveling and crack resistant product.  Please refer to the cracking […]

Cost Effective: Lightweight concrete is significantly lower in cost than gypsum concrete.
More Durable: More resistant to moisture.
Strong enough to be the finished floor (colored concrete).
Dries Faster.
Will not need waterproofing or bond enhancing sealant.
More than twice the thermal conductivity (K-Factor)… Compare Gypsum concrete at 5.4 K-Factor and Thin Slab concrete is 12.0 K-Factor.