Kbird1, DavidJPotter, thanks to both of you for the quick replies. I actually need the floor a bit thinner, so it looks like I've either got a house too tall, or a ceiling too low. With all the other wonderful tools and options in this software, it's disappointing they'd cripple this one rather important dimension in a package they label as having the "Best" level capability for Home Design and Remodeling. But I very much appreciate both you taking the time to respond!