 Behind my house that I put up, that has been running on the same battery for a year, one battery for a year, and it's a motion detection light. So lots of opportunities to improve your lighting and your security at the same time. Margaret in Virginia is next on the Money Pit. How can we help you, Margaret? I have an old house. Part of it built Civil War era. Okay. The floors in the oldest part are pine, and the boards are about 2 1⁄2 inches wide.