The word “plumb” comes from the Latin word Plumbum meaning lead. To insure that any given vertical line was true or plumb, a piece of lead was hung by a string and all work or measurements were taken from that vertical line.
Level means to be true to a horizontal surface.
These two terms were important to create a starting point in a building project and all the other measurements or additions could be measured in relation to that ninety-degree angle that was formed where a plumb line meets a level surface.
However, today we have modern laser levels or the old stand-by steel or wooden levels to help insure that our working surfaces are level. To make sure the walls are plumb, you can use one of the older levels, which have two extra site bubbles or one of the modern laser levels.
When needed, I have sometimes used a pocketknife or some other heavy piece of metal tied to a string to substitute as a plumb bob. The old plumb bob is seldom used today in homebuilding and remodeling projects, but it is still an invaluable and cost-efficient tool widely used on larger construction projects.
C. Dwight Barnett is a certified master inspector with the American Society of Home Inspectors. Write to C. Dwight Barnett, Evansville Courier & Press, P.O. Box 268, Evansville, Ind. 47702 or email him at d.Barnett@insightbb.com.