how thick is a 2x8 board
- The Nominal size of a board is the way you talk about the size. When talking about a 1x6 board, 1 and 6 is the Nominal size. The actual size is 3/4 x 5-1/2.The nominal size of a 2x8 is 2 x 8, but the actual size is 1-1/2 x 7-1/2.To determine accurate coverage, the actual size of the board is used.The actual size is the actual coverage of the board.hen talking about a 1x6 board, 1 and 6 is the Nominal size. The actual size is 3/4 x 5-1/2.The nominal size of a 2x8 is 2 x 8, but the actual size is 1-1/2 x 7-1/2. To determine accurate coverage, the actual size of the board is used. The actual size is the actual coverage of the board.