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Z/50/16 - Each roll is 50' long x 17 1/4'' width (for 16'' joist spacing) x 30 mils thick - black astm heavy duty polyethylene - Easy to install and affordable: goberco deck membrane + 4'' tape + regular downspout is between 1.5 - 2$/s.f. - U.S. patent # 9,453,338 z-folds allow this unique membrane to act as flashing + gutter/channel between joists + funnel meaning less risk of leaks at ledger board and rim joist. - Save time and money: no need of extra flashing and funnel (simply use regular gutter downspout). - Compatible with treated wood, cedar or composite decking - Get extra storage under the deck, protect deck structure, get water, insects (termites, ants...) off the deck. - Available for 6 years, sold thousands of roll across USA and Canada, 20 years warranty (see website for details).