That deep foundation/slab insulation is a great way to go. It brings the normal moderate subsurface ground temps all the way up to the slab and makes a big difference. Just like free heat, all the time. It does require that the structure be insulated (else the slab and soil under it cools off). Its also possible to achieve the same thing with nearly horizontal foam "wings" that extend out from the slab/foundation perimeter 4 feet or so. Just bury them deep enough to prevent them from damage from vehicles etc. Usually it's a lot easier to just go straight down during new construction.Foam insulation 2' deep around the footer and floor. The coldest I have seen in the hanger when it had no heat was 50 degrees on a below zero OAT.
As you've probably surmised, a torpedo heater or any other combustion heater that vents into your work space is going to be bad news. If the place is now sealed tight, and all those heaters dump tons of water into the air. That'll condense onto your cold tools, airplane etc. To say nothing of O2 depletion inside, CO risk, etc.
I'm not the code police, but unless that interior foam and facing is rated for exposure, then it would be a problem.
Those are nice. Even if the shop is 50F, it feels nice and toasty under the radiant tubes. Kinda pricey to buy for us folks who would only use them a few months per year, but if I found a used setup (from a small car repair shop being torn down, etc) I'd be tempted.Up here in northern Idaho a lot of hanger have gas radiant heat . It a long tube that gas flows through & burns heating the tube Element . In the winter time when it’s below zero to keep my shop at 50° the gas bill runs me about $50 a month.
I live in the PNW where trees are everywhere. I go out every spring and kill enough for 4 cords of wood. That heats my 1,000 sq. ft. shop and my house in the evenings. Costs me about $20.00 for saw gas and $150.00 for wood splitter rental. I work on composite airplanes so I keep the shop a 80 degrees all winter to keep the viscosity of the resin less viscous. Here's a "widow maker" I dropped 2 days ago that had blown over into another tree. After cutting it wouldn't fall being hung up in the other tree so I had to yank it off the stump with my pickup. Pretty fun!Just some general comments:
Not everyone likes radiant heat. I'm one. Can't stand to work under them.
Spray foam under metal roof panels? The local spray foam contractor won't do it. Had too may fall off due to leakage around the hold down screws. Freeze thaw cycle contributes to the separation. Could just be the local contractor?
I have poked my share of plastic backed glass insulation under tin roofs to pop the water bubbles. We only get 8" of precipitation a year.
Diesel/salamander heaters? I heated my shop for many years exclusively with them. It was cheap, noisy, and smelly. Other than that no problems.
Don't even THINK about using them anywhere near a composite plane project.
TINSFGIAV There Is No Substitute For Good Insulation And Ventilation.
I actually contacted the local gas company today to get an idea of what my costs would be.
Initial setup is going to be about $2,500 - $ 3,000.
That's for the tank,fill and heater.....hookup is on me to do.
Then it's about $1k per year to fill.
That's quite a bit more than I expected.
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