Protect Finished Flooring with Hardboard
Rosin paper, cardboard and dropcloths are all legit ways to protect a floor—that is, until you knock your trim gun off the top of a 6-ft. ladder. If you really want to ensure that a floor stays dent- and scratch-free, cover it with 1/8-in. hardboard. It's pretty cheap, and as the name suggests, it's pretty hard. Cut the sheets with a circular saw or jigsaw, and to prevent scratches, make sure both the floor and the hardboard are perfectly clean before you lay the hardboard down. Tape the seams with masking tape to keep the dirt and debris from slipping through the cracks. When the job is done, pull up the sheets and save them for the next job.