slushfund wrote:

Just wanted to let you know about insulating a toilet tank. Last post
around a month ago.Finally found some foam at HD. It's used as a barrier
between the foundation and sill plate of a house. Comes in 3 1/2, 5 1/2 and
7 1/2 inch widths on a roll that's 50 ft long. 5 1/2 inches fits just about
perfect on the bottom of a toilet tank without much trimming. I realize 50
ft is a lot but the entire roll was only $5. Tried to adhere it with some
adhesive that came in a tube like silicone caulk but it didn't hold at all.
Had to take it apart again and use silicone caulk this time and worked
perfectly.

Saw a kit at Lowes. 5 precut styrofoam pieces with adhesive in a clear
plastic bag. In the aisle with the toilet tank repair parts.