Originally Posted by BullGator
I just noticed this thread today. I am actually in the middle of my keezer build and am making the sides of my collar similar to yours. I am using 1x12 poplar for the outside. 1/2" blue installation board in the middle, and 1/8" sheet of birch on the inside. I am just planning on painting mine white because the freezer is in my garage and my tiame is limited. Where my shanks will go through, I may add some 1/2 strips of poplar to stiffen it up there. I geuss i am worried my system will not be very energy efficient because overall it will end up being like an 1 1/2" thick. That and the installation board only has an R value of 3.
What do you think?
Sounds fine to me. A lot of people here use just a 2x without any insulation at all (~1.5 R value?). I haven't heard any complaints of major inefficiency issues, and what you're describing would have 2-3 times the R value. I'm no expert, but I'd think making it airtight is just as if not more important than the R value of the collar.
If you really wanted to you could use some aluminum foil. It would help reduce radiant heat transfer, and might help a little. You could staple it to the poplar and/or plywood, or tape it to the foam before assembly.