When you look at the labels on boards, you’ll see simple sizes like “1x6” or “2x6.” That’s the nominal size of the board, which describes the board’s dimensions before it was machined to finished size. The finished size, known as the actual dimension, will be slightly smaller in thickness and width. For example, a 2x4 board actually measure 1½" thick x 3½" wide.
If you are using a
, like the ones on
, the materials list may say to buy a 1x4 (the nominal size), but the dimensions in the plan will base everything on that board’s actual size — 3/4" x 3½" in this case.
If you are drawing your own project plan, make sure that you use the actual dimensions for all of the boards. If you accidentally design your project using the nominal dimensions, it may not go together as you had planned.