Composite - Decking - Lumber & Composites - The Home Depot.Shop our selection of Composite, Decking in the Lumber & Composites Department at The Home Depot. . Pro 1 in. x 5-3/8 in. x 16 ft. Graystone Grooved Edge Capped Composite Decking Board (10-Pack). Model# 1100646. $41715/package. Shipping unavailable. Set your store to see local availability. Compare.