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Insulating garage doors

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SavannahLion:
How much waste did you encounter using the 4'x8' sheets?

ahofle:
I can't remember the exact amount, but I do know that the waste pieces ended up fitting just about perfectly between the garage's studs so I just fitted them in there hehe (most of the sides of the garage were not insulated either).

AtomSmasher:
Well this thread has inspired me to insulate my garage door as well.  I just bought three 1 1/2'' sheets of insulation (its tough to tell exactly, but it seems to say its rated around R7) and will be installing it later today.  By my calculations I will be a little bit short and will probably have to go back and buy a quarter sheet, but I figured I'd wait and see how much I need before I do that.  Total cost so far is $65 and that includes a roll of aluminum tape which I will use around the edges.

AtomSmasher:
Well I've now got one sheet of insulation installed, but its over 100 degrees in the garage, so I decided to take a break.  Overall its been very easy so far.  I score the insulation with a knife, then snap it off and install it, but it does take a bit of time since I'm being very careful to make the cuts accurate.  One sheet cleanly fills 4 sections (16 sections total on the door) and I could use the scraps to fill a 5th section, so if I bought another quarter sheet I would have enough to finish the door.  However, I would like to make each section very clean and not have a line in the middle where I taped the pieces together, and with full sheets only costing $17, I think I'm going to buy another full sheet to finish it off.

Also, paigeoliver was right.  I don't need to glue or tape the insulation into the door since each section curls inward a bit to form a lip which holds the insulation extremely well.  I'll probably end up returning the aluminum tape I bought and get a few dollars back.

Another thing to note, I didn't realize how hot the metal garage door actually got until now.  I could probably fry an egg on it, which means this insulation should help immensely.  Thanks a ton to everyone here who gave me the idea and information to be able to do this.

ahofle:
Good deal.
Just curious, how did you get the sections in?  I had to score the middle of each section to 'bend' the piece to get it to go in.  Then I used the aluminum tape to keep it in place.  It would have been much cleaner to just have the pieces slide right in, but the stuff I got was not flexible at all. 

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