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Message: <blockquote data-quote="REY_off" data-source="post: 229781" data-attributes="member: 693"><a href="https://www.menards.com/main/building-materials/insulation/foam-board-insulation/owens-corning-reg-foamular-reg-extruded-polystyrene-insulation-2-x-4-x-8-r-10/270919/p-1444450504174-c-5779.htm?tid=6809529552799743510&ipos=8" target="_blank">https://www.menards.com/main/building-materials/insulation/foam-board-insulation/owens-corning-reg-foamular-reg-extruded-polystyrene-insulation-2-x-4-x-8-r-10/270919/p-1444450504174-c-5779.htm?tid=6809529552799743510&ipos=8</a>That's the most common stuff used in floor heat applications, comes to 1.18 a sq ft, and thats not including the cost to insulate the stem walls to eliminate thermal bridging. When you are roughing in floor heat, the insulation is the majority of the cost. The pipe is cheap. Again, If you are going to insulate the floor, for a few hundred more, you would be dumb to not install the pipe incase you wanted to use it later on. At that price, If I had to insulate my garage floor right now, It would be 1900 bucks. The pipe would cost 300.- - - Updated - - -I went through Radaintec, a online company who specializes in designing radiant floor heat. They spec their systems with boilers and/or the only tankless hot water heaters that are warrantied for use in a radiant floor heat system (American Tankless). You are correct that condensing boilers are considerably more, and  technically the "correct" way of going about it. I was skeptical and still have my doubts, but these guys sell a lot of these systems and as long as I had a warranty I was willing to take a chance. The company was great to work with before, during, and after the sale, which also made me more confident. It's been in service for 3 winters now with zero issues. A good concrete prep and install should insure that you don't ever have a leak, but weird things do happen. One thing for sure, is that you can't compare the two types of heating when it comes to heating a garage. Radiant floor heat is far and away the more comfortable way to heat that space. But, again I'm still not sure if I can justify the cost.</blockquote>

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