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Further study shows the subject to be of almost unbelievable complexity." Homer Powley This topic has come up before, so you might try using the forum search function to see what you find.Yeah, I did a search here but the search function is pretty lame.So to answer your question, if you have a 3" door you could achieve a theroetical R-15 with foam.I guess they must have wonderfully thick plastic skins to get another R-3 out of them (to get R-18). Darryl You can buy R15 fiberglass batts "right now" that will fit in your 2x4 stud walls...there is some behind the guest shower unit in our addition "as we speak".The HD only has doors that are R6.5 and R9 (if I recall correctly). What's advertised is the theoretical insulation value of the foam in the door, which is probably as high as you're being told, but the overall door assembly is most likely half that at best.
I had a local contractor install one on my garage a few years ago.I googled too and it just shows benches not the benchrest tand itself.Tried ro wring googles scrawny little neck to give me stands but was not successful.Even on a cold day when I'm in my shop I raise both doors about 6 inches for ventilation. When we built in 2002, I had Overhead Garage Door Co, doors installed.And on good days both ends of my shop are wide open and I often drag machines outside. They are the 'Thermacore 490 series and are advertised at R-17.5.