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Old 08-20-16, 03:45 AM   #10
philb
Apprentice EcoRenovator
 
Join Date: Nov 2010
Location: Oklahoma City
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I have discussed radiant flooring with several contractors in your area.
All use 100% water.
All start from one central place and stretch the tubing to each room so all the tubing are exactly the same length and therefore the same pressure. Most build with stemwalls which are back filled with sand. That's were the tubing is placed as opposed in the slab.
Some of the local concrete companies offer a mix that's made to imbed per in the slab. Swartz comes to mind.
Some of my neighbors have had radiant floors for ten years. The ones with the pex on one foot centers have warm and cold spots while the ones with 6 inch spacing love it. They consider radiant heat to be the base heat. They still use other forms of heat to supplement that. 100% of the folks I've spoken to use hot water tanks as their radiant heat source.
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