I have two 8'highx10'wide,
Commercial 2000 Series Hass #2032-20.
- V groove 20gauge smooth steel, manufactured in Ohio, USA
- 17.66 R Value
http://www.haasdoor.com/commercial/2000/index.html
20 years ago, I heated my over insulated 24x30 ft garage (no windows, 2x6" framing) with a home style mid efficient natural gas furnace 24/7 the whole winter season for only $250 extra on my heating bill.
15 years ago, our young son run the Honda CT70 mini bike front tire into the sectional door, at low speed - didn't even leave a dent / glad I didn't have 24or26gauge panels, after that.
In 1991, I had both doors installed for $2,000 Cdn. in total, with HD tracks & large tension springs.
I don't know how much they cost today, but would buy them again, if building another garage.