I suggest a simple cheap fix that has worked for me in Michigan.
Go to the hardware store and buy a few grey foam pipe insulating four foot
sticks. Apply them to both ends of the door and trim to fit by trial and
error. When you can no longer see daylight under the door when it is closed,
you have finished the project. This stuff hangs onto the bottom of the door
without any nailing or gluing. From the outside, you can see it, but who is
going to walk around looking at the bottom of your garage door?
MUCH CHEAPER is the "Pool Noodle" at Walmart. I think it's like $2.00 for a
four-foot, 3" diameter stick. It has a 3/4" hole down the center. I slit
some open with the table saw and used them instead of the $8.00/ft
insulating tubes from HD to cover the AC lines. Worked swell.
I actually thought about that when I posted. Noodles may be scarce in
the winter, but I will look for them. If not for the GD, then for some
3/4" PVC (small task here).
It is freezing at night in Vegas..
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