
Trex Enhance Basics 1-in x 6-in x 20-ft Clam Shell Square/Scalloped Composite Deck Board
How many 16' boards for 21x21 deck? Diagonal
1
Hello, thank you for your interest in Trex! For information regarding how much material is needed, we recommend using our Deck Designer Tool! This can be found on our Trex.com website under "Start Your Project". You also may want to consult with a contractor for a materials estimate as they may be able to give the most accurate information. If you have any additional questions about Trex, please feel free to call us at 1-800-289-8739 as we are happy to assist! Thanks - Paul, Trex Customer Care
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