What is the minimum grade of lumber you may use when framing a house?

The minimum grade of lumber used for framing a house is typically No. 2 grade. This grade provides enough structural strength for load-bearing components while maintaining a balance between cost and quality. No. 2 grade lumber has some defects but is still strong enough for construction purposes, making it a common choice for framing applications.

Using lumber that is graded below No. 2, such as No. 3 or lower, may compromise the integrity and safety of the structure. It can have more significant knots, warping, and defects, which could lead to structural failure over time. Therefore, adhering to using No. 2 grade lumber is crucial for ensuring that the building meets safety regulations and construction standards.