Who: Robert Lattin
"There are lots of commercial leveling compounds on the market, but they can be expensive and difficult to mix and pour—especially if you have a large surface area and are working by yourself. When I found out my floors were sloped, my solution was to use plain old kitty litter instead. After I checked to make sure the poured litter was level, I screwed half-inch plywood over it to make a flat surface. The litter levels the floors and also acts as a sound dampener."
What Robert Saved: About $3,060