Family and friends thought I built my shop with a bit of an overkill, with the insulation and sealing that I did. But I've got the last laugh! I live in south Louisiana, so my shop was built more thinking for
hot summer weather, as our winters, NORMALLY aren't so bad. (This year, Winter got the last laugh! LOL). Anyway, after Katrina did some minor damage to the back yard (2 rows of shingles on the house, knocked a pecan tree down, and destroyed my small metal garden shed and my larger old wooden work shop, I took what money my insurance company gave me, did most of the work myself and saved $4000. I then took that $4000. and built my 10x16 new garden shed/workshop. I few years later I added 4' to the length, to get the garden equipment out, and use the 10x16 just for my shop. But the original 10x16, has three layers of extra tar paper (left over from the new shops roof) in between my subfloor and 1/2" plywood floor. The pink insulation in the walls and ceiling. And all corners and seams of my 1/4" birch walls and ceilings, are sealed with silicone. In the summer, it can be 98 degrees outside, its MAYBE 75 in the shop. If I was just to sit down, in the middle of the summer, I wouldn't break a sweat. But since I work in there, I've got a small window unit. Turn it on low for a little while, and you can hang meat in there!! Winter, it's 29 outside, right now, I bet it's no colder then 50-55 inside. I have a small electric heater. 5 minutes, and I have to turn it off! Money well spent!