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Exterior wood framing walls must be made of at least which grade of wood?

  1. Utility

  2. Grade 2

  3. Grade 3

  4. Grade 4

The correct answer is: Grade 2

The requirement for exterior wood framing walls to be made of at least Grade 2 wood is rooted in the need for structural integrity and durability. Grade 2 lumber is classified as having a good balance of strength and appearance, making it suitable for applications such as framing where it is exposed to the elements. This grade provides sufficient load-bearing capacity and resistance to warping and splitting, ensuring that the structural components can withstand various weather conditions. Lower grades like Utility, Grade 3, and Grade 4 do not meet the necessary criteria for strength and durability when used in exterior applications. Utility grade may have defects that significantly compromise structural integrity, while Grades 3 and 4 contain more imperfections, making them less reliable for framing purposes. Therefore, using Grade 2 wood ensures compliance with building codes and industry standards, promoting safety and longevity in construction projects.