Question

What does the black diamond on a tape measure mean

Answer 1

Answer:19 3/16

Explanation:

The black diamonds which appear every ”19 3/16  on metal tape measures are for spacing I-beam “timbers.” Several wood-product manufacturers offer I-beam “timbers” as a substitute for solid lumber floor joists. The diamond marks on tape rule blades are for spacing these engineered floor joists in new construction.