I have a 2 car garage with a large single door so I bought 2 kits. I live in AZ with the garage door facing south toward the sun which makes the metal door too hot to touch. These panels are great! Before purchasing the panels the garage was too hot to stay in for long, now it is comfortable all day. I had to cut the reflective sheets to a smaller size so they would fit inside the garage door sections. Each section for my particular garage doors had a lip where the reflective insulation could be pushed into it...that held the insulation in place even without the double-sided foam tape. I used the foam tape anyway. If I had to rely solely on the tape to hold the reflective insulation in place then I am not sure it would have been enough tape. Certainly not enough for one blunder where I had to pull the tape off and straighten panel. All in all - these are so great! I wish I bought them years earlier. I am moving to new house and just bought them again.