The heaviest steel decks for long-lasting safety. All Landscape Structures decks are formed from 12-gauge (.105") steel-the thickest in the industry. They're flange formed to create safe, rounded corners, and reinforced with .105" x 2" ribs welded on cross for superior strength and a consistently flat surface. Decks are flush mounted to the outside of posts, creating more play space and reducing awkward spaces where toes or hands could get caught. They're perforated with 5/16" -diameter holes that provide drainage but won't trap small fingers, and they're TenderTuff™-coated for a comfortable play space year-round.