Garage floor

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stable that upper 2 inch pour would be? Seems you would have some thin spots above the tube, possibly less than the 1-1/2" recommended.

If it didn't have vehicle traffic it might be worth the gamble. I have him sign a waiver of "crack release" :)

hot rod

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Wayco Wayne_2

I have a customer

who wants to have radiant floor in his garage to be built soon. Of course he wants to turn it on and off to save energy. I told him of the impracticality of that because of how long it takes to charge the thermal mass of the slab. However it got me thinking. What if we made a slab sandwich, where the bttom was the thick main structural slab maybe even a monolithic pour, then you put down 1" high density blue board extruded polystyreneon top of that, staple the tubing to that, and then topped it off with 2 inches of concrete. The 1 inch oround the perimeter of the top slab is a given, right? You would have a smaller thermal mass that would be faster to charge up. What would be the drawbacks to such as design?? WW

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johnnyd

water temp

I'm on my third season in a well insulated garage/shop with tubing in the slab. 2" XPS under the slab and 4" all the way around. PEX on the foam, then rebar and the 4" slab. So the PEX is really near the bottom of the slab. I run the supply temp at 130°. 8K HDD. I keep the air temp at 50° - 55° steady state just using a thermocouple thermometer. When I want to work in there on the weekends I can bring the air temp up to 65° in about 2 hours. I think you need to run fairly high supply temps to ramp up that quick. If he wants to have it go from 40° to 70° in minutes, put in one of those heater blower up on the ceiling and than feep the slab steady at like 50° or something.

Wayco Wayne_2

Thanks for the input guys

I was just supposing. All they have is a mini-van and a sports car and 2 motorcycles. Not a lot of weight. Keeping the temp at 50 is the more reasonabble scenario. WW

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