What is the common metal gusset plate size on a gable roof?

What is the common metal gusset plate size on a gable roof?

• A. 18 gauge 1/4 inch
• B. 16 gauge 1/2 inch
• C. 20 gauge 3/8 inch
• D. 18 gauge 3/8 inch

Answer: (D)

Gusset plates in gable-roof connections are chosen to balance strength and practicality. 18-gauge steel is the standard thickness because it provides solid shear strength for typical residential roof loads while remaining easy to bend and drill. The 3/8-inch dimension typically refers to the bolt hole size, which is a common size for securing the plate to rafters and supports without weakening the plate excessively. A thicker gauge (like 16) adds unnecessary weight and cost for everyday gable-roof uses, while a thinner gauge (like 20) wouldn’t hold up as well under load. Together, 18 gauge with 3/8-inch holes is the usual, reliable choice for these plates.

Gusset plates in gable-roof connections are chosen to balance strength and practicality. 18-gauge steel is the standard thickness because it provides solid shear strength for typical residential roof loads while remaining easy to bend and drill. The 3/8-inch dimension typically refers to the bolt hole size, which is a common size for securing the plate to rafters and supports without weakening the plate excessively. A thicker gauge (like 16) adds unnecessary weight and cost for everyday gable-roof uses, while a thinner gauge (like 20) wouldn’t hold up as well under load. Together, 18 gauge with 3/8-inch holes is the usual, reliable choice for these plates.