I have a 2-car garage and golf-cart garage. Due to the southern exposure, these doors quickly get very hot due to the radiant heat from the sun. I got a few quotes to address this issue:
$750 for Romac to install foam board with white vinyl backing
$525 for Romac to sell materials to me that I would install
$550 for Munn's to install foam board
$350 for Solar Guys to install a radiant barrier (foil-covered bubble-wrap)
$150 to purchase 11 sheets (4' x 8') of foam board with radiant barrier (foil on both sides) [Lowes:
;]Link Not Found | T.LY URL Shortener, Custom Domain & Link Management I would have to cut the board and temporarily remove the horizontal door braces to install it (there are many youtube videos showing how to do this)
$100 to purchase 100' of radiant barrier [Home Depot
;]Link Not Found | T.LY URL Shortener, Custom Domain & Link Management This is super-easy for anyone to install!
I decided on the last option. The installation took a few hours but was very easy. The 24" roll exactly fit the height of each panel in my garage door. I used ordinary scissors to cut pieces to the correct width (pieces should be 4-5 inches wider than the door panel). Note that you will need to measure each panel because some of the panels are likely wider than others. I then folded the extra material back on the left and right side and slid the radiant barrier behind the braces and into the "frame" for each door panel. They will stay in place without need for any glue, tape, or other attachments.