Deck Board Dimensions: How to Choose the Right Size
The nominal dimensions of lumber are commonly based on the rough cut size before being planed smooth on all four faces. Dimensional lumber is what is produced by planing the rough cut lumber smooth. A nominal or rough cut 2×6 planes down to 1-1/2”x5-1/2” while a 5/4×6 dimensionally is actually 1”x5-1/2”. Common Decking Board Thicknesses