You really can’t get an accurate level reading on an area that is larger than your level without a little modification. Effectively extend the accuracy of the level by putting it on top of a perfectly straight 2×4.
If you purchase a new 2X4 for this purpose be sure to use it within a day or so since it may warp as it dries out. On a vertical surface you may want to tape the level to the straight board to simplify the process.
Radio Show Co-Host
Joe Truini is a contractor, author, and the host of “Simple Solutions” on Today’s Homeowner TV and the weekly Today’s Homeowner radio show. He has worked on both large commercial projects and residential remodeling, and has written for national publications such as This Old House and Popular Mechanics. He has also written eight books, including three best-selling shed-building books. Joe lives in Connecticut with his family and enjoys hiking, traveling, and baseball in his spare time.