Wall Framing - 2 x 4 Versus 2 x 6

In general, 2x4 wall framing is structurally sufficient for garages. Behm Design garage plans typically specify 2 x 4 studs @ 16" o.c. spacing with double top plate and single, pressure-treated bottom plate, which is called "conventional light framing". This construction is in prescriptive compliance with the building code. .......
When bearing wall heights do not exceed 10 ft. 2 x 4 framing is code compliant. (Note: our "economy" series plans call for 24" o.c. stud spacing.)

Exceptions:
Rarely, local authorities will impose requirements for 2x6 wall framing due to extremely heavy snow loads, high speed winds and for maximum wall insulation values. Note: if your plan calls for 2 x 4 framing and 2 x 6 is required, you can usually just substitute the 2 x 6 material for studs, wall top and bottom plates. (Your local authority can advise on that subject)

Most of our garage plans with living areas call for 2 x 6 framed walls to accommodate standard wall batt insulation.

High Walls:
If bearing wall height is greater than 10 ft. the building code requires that they be engineered to verify their load capacity to resist bending of the studs. In some cases, local authorities may waive this if framing is increased to 2 x 6 and your height does not exceed 12 ft..

Stud Spacing Practicality:
16" o.c. spacing works better with locating and supporting wall shelving and storage systems than the 24" o.c. spacing, allowing greater planning flexibility.