Questions and Answers

Common engineering questions answered by our professional engineers.

A: A flat girt is installed by nailing a board (usually a 2 x 6) directly to a post with hot dipped galvanized nails.

A: The most common grades of posts are #2, #1 and Select Structural. The most readily available grade is #2.

A: Four common post sizes are 6×6, 6×8, 6×10 and 6×12. Pole buildings in the Northwest commonly use Pressure Treated (PT) HEM-FIR wood for posts. These posts are referred to as “solid sawn”. Nail laminated posts made for 2×6 and 2×8 boards are commonly used elsewhere.

A: The most common bay spacings in pole buildings built in the Northwest are 12′-0″ and 10′-0″. Other parts of the U.S. commonly use 4′-0″ and 8′-0″ bay spacings.

A: The most common roof pitches are 3/12 and 4/12. Roof pitch describes the angle of the roof. It is measured by laying out 12″ horizontal and the appropriate number of inches vertical. It is generally accepted that the 4/12 pitch is “prettier” than a 3/12.