Obtain full 96-inch (8-foot) boards. The shelf sections
should average 48 inches, so using the common 93-inch boards will likely
result in more waste from left-over end pieces.
We recommend Lowes' Top Choice Prime #2 Fir (kiln dried, not
pressure treated). This is the most consistent across the US in our
experience, and of a good quality to provide homeowners with maximum
See FAQ #6 for more information.