Ask Irwin

What is the Diamond symbol every 19'-2" increment?

The diamond symbol represents an alternative on-center spacing for framing materials. The spacing matches 16" on-center spacing every 8' making it compatible with most sheet goods (plywood, OSB, and paneling). The benefit of using the diamond symbol is that you save one joist or stud every 8'.

Ask Irwin a QuestionClick a question below to view the answer.


Circular Saw Blades

Drill Bits


Fastener Drives

Hand Saws

Hole Saws


Marking Chalk

Pliers and Adjustable Wrenches


Tape Measures

Taps, Dies, & Sets

Utility Knives & Blades