I see allot of people using insulation board around their collars. I know how much of a pain in the butt it can be to work with these boards in cutting them down to size so I was looking at an alternate solution by using a roll on insulation application (glue and staple to inside of collar). My thought was to use the product in the link below. It has similar R- values as insulation board so I thought this may be a good alternate solution to the board as it is easier to cut this material. Thoughts?
http://www.homedepot.com/p/Reflecti...PIPHorizontal1_rr-_-204476659-_-100012574-_-N
http://www.homedepot.com/p/Reflecti...PIPHorizontal1_rr-_-204476659-_-100012574-_-N