how many 16 ft boards would you need to cover a patio that is 16 ft by 24 ft?

Good afternoon! For accuracy, Trex always recommends speaking with a contractor prior to purchasing material for quantity confirmations. There are many different variables that go into constructing a deck. The dimensions provided equate to 384 square feet, which then equates to 806.4 linear feet. If you divide the linear footage total by the length of the board (16') this equals roughly 51 boards. I would like to reiterate that this is simply an estimation and several different variables can alter this quantity estimation. Please reach out to us 1-800-289-8739 if you have any additional questions. Thank you, Alecia - Trex Customer Care Team