Stripped 4 homes last week. One all the way to the ceiling the others 4 foot up. I used one of these and cut the corner where the wall meets ceiling then rip the whole wall out. The ones we took four feet out we pulled a chalk line and used the cutter to cut on line. Much faster than a razor knife and a lot straighter.
Bring plenty of wheel barrels and put sheet rock directly into wheel barrels. Takes to long to come back with shovels and scoop the mess up.
http://www.homedepot.com/b/Tools-Har...s/N-5yc1vZc2b2