Kubbie- I know insulation on the top and sides of your barrel would have more effect. My barrel wont even melt the ice under it when I do winter smokes so there is no need for me to worry about heat loss to the bottom.
On a different note-Seems like everyday someone is taking shots at smokers. First it was the Traeger not giving any smoke, next it was the BG egg falling apart and next we'll see somebody taking shots at the UDS. Problems with the Egg and Traeger seem suspicious and if someone comes along with UDS trouble well we will KNOW that is suspicious!!! LOL