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What are the black diamond markings on a tape measure?

In: Building and Carpentry, Lawns and Grass, Interior Design [Edit categories]

Answer:

the marking are what we call the 19-2 layout (19 and 2/10ths inches). used more with floor trusses. the floor trusses are strong enough to be spaced just over 19 inches apart and a sheet of floor decking still works being half on the truss at eight feet. floor trusses are made of 2x4's and steel plates.

First answer by Mikeykv. Last edit by Jrstein. Contributor trust: 16 [recommend contributor ]. Question popularity: 21 [recommend question].

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