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This is a typical layout for radiant heat in a concrete floor. The rebar is placed on slab bolsters(stands) that place the rebar one third of the concrete thickness up from the bottom. We use American made grade 60 rebar that is 3/8" in diameter. The rebar is placed on 12" centers. The stands are placed end to end across the width of the building, with the rows of stands no more than 3' apart. On a well insulated building the 1/2" pex tubing is placed on 12" centers, with a maximum of 250' length per loop. This layout will yield 20 btu's per sq. ft., and still keep the temperature of the water low, to give you maximum efficiency out of your system.

Some companies, and installers are promoting 300' ft. loop lengths for 1/2" pex. We don't believe in this. The extra 50' of length creates a lot more flow resistance for the pump to over come, and you will get considerably more temperature drop on the water. This will tend to make the heating of the floor uneven. To compensate for this, some companies are recommending moving the tubes into 6" centers instead of 12" centers. This is fine if you are a piping manufacturer, but this makes the consumer buy twice as much pipe. Not a good deal.