North American Standard 2-by Lumber NOMINAL SIZE (INCHES)ACTUAL SIZE (INCHES)ACTUAL SIZE (MM) 2 x 2 1 1/2 x 1 1/2 38 x 38 2 x 3 1 1/2 x 2 1/2 38 x 64 2 x 4 1 1/2 x 3 1/2 38 x 89 2 x 6 1 1/2 x 5 1/2 38 x 140 2 x 8 1 1/2 x 7 1/4 38 x ...
When we talk about Nominal vs Actual, we are referring to the size of materials. This is particularly relevant to structure, such as the timer/lumber sizes. In North America one of the most common lumber sizes is 2×4. So, you would think that when you draw a wall with 2×4, that...