I looked everywhere on Google, and all I can find is the R-value of insulated garage doors (which I didn't even know existed!).
What is the R-value of a traditional garage door, made of a simple sheet of steel?
Interesting fact number 923:
Half the world's population has seen at least one Bond movie.
It would be roughly the same as sheet steel, very poor. Glass, single
pane is .9 aluminum siding is .61 with no insulation. Plain steel is
little more than a windbreak. You can glue on foam board though.
This shows steel siding
Impossible. That's like having a resistor of -1 ohms. That would be a battery. Or in the case of a garage door, it's sucking heat out of the garage - what you've got there is a fridge that uses no electricity. Patent it immediately!
Flanders and Swann on MOT tests:
Our car is getting a bit old, it'll have to be tested soon.
Easy to find them on Google (I found them while trying to find what mine was), on sites for manufacturers trying to sell you them, they range from 6 to 18.
I've seen plastic garage doors on new houses, but never examined how thick they are. I assumed they were just cheaper than steel ones. I thought I was unusual in having a heated garage, so nobody bothered insulating them. My house was built in 1979, as was my next door neighbour's. Both have non-insulated garage doors. I guess you live in a newer house.
Do they also build garages with cavity walls now? Mine is just single brick (or it was until I modified it), and my neighbour's is 1 inch thick concrete panels!
"If women are so bloody perfect at multitasking,
How come they can't have a headache and sex at the same time?" - Bill Connolly
My bilevel home with built in 2 car garage was built in 1988.
It came with thin, uninsulated wood garage doors. Each door panel was
less than 1/4 inch thick. I paid extra to have the garage walls
insulated, otherwise the builder would have only insulated the ceiling,
which doubles as the bedroom floor.
I replaced the doors with r19 metal/foam sandwich units with double pain
It makes a significant positive difference during both heating and
Clopay do make the old non-insulated doors (first company I've seen that does), but they don't quote R for them (maybe it would be embarrassing, and not important to someone not buying an insulated door anyway), they just quote R for the insulated ones: "Insulated door R-values from 6.3 to 18.4."
Mind you, it would be a good selling point for their insulated doors if they quoted a heat loss of 1000 times less than a steel door.
10 times as many people are killed by coconuts falling on their heads as are eaten by sharks.
Well there are still fully-detached garages for which it really doesn't
matter...have three here on the farm place. The double car garage uses
the lightweight fiberglass from Raynor I think; the old truck garage
that serves as a shop now has wood.
My garage is attached ot the house, but I don't see the need for an
insulated door as I don't use the garage for anything but to put the cars
in. The walls around the garage that meet the house are insulated.
Well, the advantage there would depend entirely on the details of the
construction but it would in many traditional constructions still be of
benefit by reducing the loss on the various dividing wall(s),
floor/ceilings, etc. as often the amount of insulation is far less than
optimum. Of course, the severity of the climate matters as well as far
as what would be a payback period...
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