If I put WarmWire over an existing uninsulated slab, will it perform well?
It should, and usually does, perform well. WarmWire cables provide up to 15 watts per square foot, which is quite a bit of heat. But sometimes this is not enough to bring your floor up to 80-85 degrees F. Slabs can be quite a drain on floor heating systems depending on the thickness, the sub grade below slab, moisture content, and heat loss from the room or outside temperatures. If you live in a cold climate and there is a lot of heat loss from the room, we recommend installing our cork underlayment as a thermal break. Bond the cork to the slab with thinset or an adhesive (we recommend Bostik Urethane Adhesive) that is rated for cork & radiant floors and then install WarmWire cable and tile as normal. If the edge of your new radiant slab is exposed to the elements, we recommend you insulate it with a layer of extruded polystyrene. You may also be able to reduce the heat loss from your room by installing higher R-value doors and windows, by reducing air infiltration and by adding ceilin
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