Can I apply shingles over board decks instead of plywood?

Can I apply shingles over board decks instead of plywood?

In most areas, the building code allows application over boards.  You need to confirm if this is allowed in your area.

When applying shingles over boards, PABCO® directs the use of well-seasoned wood boards 1" minimum nominal thickness, 6" maximum width.

See the PABCO® Directions For Application for additional details and related information.