- Joined
- Nov 8, 2012
- Messages
- 783
I live in west, central Illinois so winters aren't quite as cold as yours, but can get very cold for extended periods.
My shop is built in a 20' shipping container, big metal box although floor is 3/4" plywood. I framed up the interior with 2x4's sheeted with 3/4" tongue and groove OSB and fiberglass roll insulation (floor not insulated). Not near the R value you have and square footage isn't as much, but I can keep my shop comfortable 24'7 with a single milkhouse style electric heater: https://www.walmart.com/ip/Milkhouse-DQ1001-Deluxe-Portable-Utility-Heater-1300-1500-W/136517959
Mine is a selectable 1300/1500 watt or fan only with thermostatic control. The thermostat is crap and heater was short cycling so my solution was a remote thermostat similar to this one: http://www.morelectricheating.com/d...MI_76p0-773QIVUL7ACh2ALwZHEAQYBCABEgLLn_D_BwE
If I were you, I'd definitely seal and cover the concrete floor. Concrete is a big heat sink and wicks moisture.
Laying down a sheet of heavy plastic and cover with some foam insul-board or similar and cover that with plywood (I'd recommend 3/4") would mitigate a lot of this.
My shop is built in a 20' shipping container, big metal box although floor is 3/4" plywood. I framed up the interior with 2x4's sheeted with 3/4" tongue and groove OSB and fiberglass roll insulation (floor not insulated). Not near the R value you have and square footage isn't as much, but I can keep my shop comfortable 24'7 with a single milkhouse style electric heater: https://www.walmart.com/ip/Milkhouse-DQ1001-Deluxe-Portable-Utility-Heater-1300-1500-W/136517959
Mine is a selectable 1300/1500 watt or fan only with thermostatic control. The thermostat is crap and heater was short cycling so my solution was a remote thermostat similar to this one: http://www.morelectricheating.com/d...MI_76p0-773QIVUL7ACh2ALwZHEAQYBCABEgLLn_D_BwE
If I were you, I'd definitely seal and cover the concrete floor. Concrete is a big heat sink and wicks moisture.
Laying down a sheet of heavy plastic and cover with some foam insul-board or similar and cover that with plywood (I'd recommend 3/4") would mitigate a lot of this.