Front cap added insulation

Several years ago, I had an issue with my flagstaff front cap coming loose on the top. Even though it was still under warranty, I decided to do the work myself and took the whole cap off. I was appalled to see the lack of insulation. There was just a few pieces of foam glued to the inside wall, with gaps of about 8-10 inches between them. I used the expanding spray foam, let it cure, then cut the excess with a knife to allow the cap to fit. I put it all back together and it was a lot better than it was.