In a hydronic heat slab on grade installation – radiant tubing is attached to re-bar or 6×6 wire re-mesh with plastic ties and embedded in cement. In residential installations, a 4 inch slab is typical. Tubing can be installed in the lower half of the slab – spacing and height will vary by design. Slab insulation is recommended, but not always necessary.
The large thermal mass stabilizes temperature fluctuations, but can slow the response time. This is a very cost effective radiant installation method ahydronic heatrecommended whenever hydronic heat is desired and a cement slab is being poured.
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In a hydronic heat overpour or topping slab installation – radiant tubing is installed on top of an existing slab or sub floor with wire mesh, plastic clips or a track system. A thin cement slab is poured over the piping. The typical thickness is 1 1/2″ although other thicknesses are certainly possible.
This method is useful in retrofits over existing slabs, sub floors, and also post-tensioned slabs. If you are able to adjust for the door, cabinet andhydronic heatts, this is another great way to add hydronic heat to your existing home.
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A hydronic heat overlay typically uses a 1 x 4 sleeper, although a 5/8 x 4 sleeper would work for 1/2″ PEX. The sleepers are attached to a slab or sub floor and radiant tubing is installed between the sleepers with or without metal plates.
Heat transfer plates enhance the evenness of the heat and accelerate the output. They may also add significantly to the overall costs.
This method is an excellent way thydronic heatronic heat to existing construction.
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hydronic heat“163″ />Hydronic heat systems can be installed with grooved sub floor boards and pre-manufactured panels. These are normally installed on an existing sub floor or slab – the pre-manufactured panels can also be used as the structural sub floor.
Aluminum heat transfer plates help these systems heat rapidly and spread the heat evenly. Typical spacing for hydronic heat in a grooved sub floor is 12″ on center, but may vary with design.
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