Hi Sal, I built a new building a couple of years ago, with many of the same requirements as you. I chose to go with a 36'x53'Morton building with 12' ceilings primarily because of the insulation package they offered. With 7"6" between main wall beams they are able to put 9" thick bats that have no thermal interuption for nearly 8'across. Then they put 14" of blown-in into the ceiling. I heat the place with in-floor radiant heat (which I installed). In the coldest days of winter hear in Iowa it cost about $30 per month to heat to 68 degrees. I zoned the front half and the back half of the shop seperately. I chose to go for the ribbed metal interior because I like the clean look it offers. One thing the salesman talked me into is using sound absorbing panels on the walls 4' down form the ceiling. They work GREAT! I've been in steel interior building where the echo was so bad it's hard to talk. These panels really work. I wanted absolute protection from rodents, so I built the building on 2' high concrete knee walls (higher concrete walls where the building is built into a hill). I love having concrete all the way around. Plus, I've found that I can mount some things to the concrete wall without having to drill into the floor and risk damage to the heat tubing. I'll send a photo of my vise stand if your interested. As far as radiant heat... It's the greatest. I use a 75,000 BTU boiler, but think I could almost heat the place with a residential water heater. If you can sweat copper and run some gas pipe you can install radiant. The key is getting a plumbing house to help you source all the components. And make sure to use a high quality PEX pipe in the floor. I'll post a picture of the heating plant if I get a chance to snap one soon. In a building with high ceilings it's great because you don't have all the heated air at the ceiling. Plus when you open the overhead doors you don't loose all the heat. One more thing to consider is beefing up the concrete floor a bit. For not much more cost I went for a 7-bag mix (they call it Interstate mix), plus added fibermesh (shredded fiberglass strands) into the mix for strength and crack control. So with the radiant floor system it layers like this: gravel, vapor barrier, 2" rigid foam insulation, 6"x6" weld wire (to tie the PEX tubing to), PEX tubing 1' on center (2' on center is ok also), 1/2" rebar 2' on center, then 4" of beefed up concrete. Good help the person who has to tear it out someday! But with heavy equipment I don't worry about the floor. Good luck on your project!
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