When I measure up a house, I sketch up the rooms and make a lot of exact measurements. Looks messy at the time, but all I need are the measurements. When I get home, I draw things up on graph paper somewhat to scale to better understand the layout and where the fills will come from. I make measurements down to the 1/2" in my sketches. If you round everything up, then later when drawing the actual layout you can sometimes need an extra inch or two. If you round things up, you don't usually remember the true measurements. This job is a good month off, and making a diagram of the rooms and cuts makes it easier to remember how to chop up the roll for the sizes I will need to cut. I went a bit overboard on this one. ..........because knowbody can stop me.