--- product_id: 115136677 title: "Under Deck Drainage System, 50 FT Roll with 12 in Joist, 3-in-1 Waterproof Membrane with Built-in Self-Flashing & Self-Funnel, Heavy-Duty 30 Mil, Top-of-Joist System, US Patent." brand: "goberco" price: "€ 313.08" currency: EUR in_stock: true category: "Goberco" url: https://www.desertcart.at/products/115136677-under-deck-drainage-system-50-ft-roll-with-12-in store_origin: AT region: Austria --- # 3.5'' deep water channel 50 FT roll length 30 mil heavy-duty thickness Under Deck Drainage System, 50 FT Roll with 12 in Joist, 3-in-1 Waterproof Membrane with Built-in Self-Flashing & Self-Funnel, Heavy-Duty 30 Mil, Top-of-Joist System, US Patent. **Brand:** goberco **Price:** € 313.08 **Availability:** βœ… In Stock ## Summary > πŸ’§ Keep your deck dry, your style high, and your neighbors wondering how you did it. ## Quick Answers - **What is this?** Under Deck Drainage System, 50 FT Roll with 12 in Joist, 3-in-1 Waterproof Membrane with Built-in Self-Flashing & Self-Funnel, Heavy-Duty 30 Mil, Top-of-Joist System, US Patent. by goberco - **How much does it cost?** € 313.08 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/115136677-under-deck-drainage-system-50-ft-roll-with-12-in) ## Best For - goberco enthusiasts ## Why This Product - Trusted goberco brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Heavy-Duty Durability:** 30 mil thick polyethylene membrane built to withstand years of weather and wear. - β€’ **Smart Water Management:** Deep channel valleys and standard downspout compatibility redirect water cleanly into guttersβ€”no drip drama. - β€’ **Cost-Effective & Time-Saving:** All-in-one system at just $2/s.f. with easy installation saves you money and headaches. - β€’ **Integrated Self-Flashing & Funnel:** Patent-backed Z-Fold design eliminates leaks at ledger and rim joistsβ€”no extra flashing needed. - β€’ **Effortless Top-of-Joist Installation:** Staple, seal, and screw your way to a dry under-deck space in minutes. ## Overview The Under Deck Drainage System is a patented, heavy-duty 50-foot roll membrane designed for top-of-joist installation. Featuring a 30 mil thick polyethylene build, a unique Z-Fold self-flashing and funnel system, and a 3.5-inch deep water channel, it ensures superior waterproofing and efficient water evacuation. Compatible with treated, cedar, and composite wood, it offers an affordable, easy-to-install solution trusted by thousands across North America, backed by a 20-year limited warranty. ## Description Z/50/12 - Each roll is 50' long x 13 1/4'' width (for 12 in. joist spacing) x 30 mils thick - black astm heavy duty and durable polyethylene - top side is black, back side is black- Easy to install and affordable: Goberco deck membrane + self-sealing tape + regular downspout total is around 2 $/s.f. - U.S. patent # 9,453,338 - unique Z-Fold/Channel allow membrane to act as flashing against house wall + 3.5'' deep valley between joists + a funnel to close the membrane end against rim/transversal joist top. This means less risk of leaks at ledger board and at rim joist. Save time and money: no need of extra flashing and a piece of regular gutter downspout attach to membrane hole diverts water into the gutter so no need of expensive funnel. Compatible with treated wood, cedar or composite wood. Thousands of roll sold across USA and Canada in the past 7 years, 20 years limited warranty ## Features - On-top of joists installation - keep framing and under deck area dry. - Easy to install - 1. Staple on top of joists 2. Self sealing tape over joints 3. Screw downspouts to water evacuation holes. - Material cost is about $ 2/s.f. (Goberco membrane is about $1.5/s.f., self sealing joist tape is about $0.4/s.f. , regular downspout + plastic gutter + roofing screws are low cost). - Save Time / Reduce Leaks - Fold against house wall for flashing (reduce leaks at ledger board) - Deep channel valley between joists - Regular downspout redirect water flow into a gutter (prevent water dripping / no special downspout needed). U.S. patent # 9,453,338 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07JJP16VN | | Best Sellers Rank | #480,070 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #291 in Roofing Gutters #407 in Gutter Downspouts #106,023 in Hardware | | Color | top side black , back side is black or grey | | Customer Reviews | 4.0 4.0 out of 5 stars (48) | | Date First Available | October 18, 2018 | | Item Package Quantity | 1 | | Item Weight | 10.28 pounds | | Item model number | 1725503016 | | Manufacturer | Goberco Building Products inc. | | Part Number | Z5016-Z5012 | | Power Source | manual | | Product Dimensions | 10 x 10 x 14 inches | | Size | 50 FT / 12 in | ## Images ![Under Deck Drainage System, 50 FT Roll with 12 in Joist, 3-in-1 Waterproof Membrane with Built-in Self-Flashing & Self-Funnel, Heavy-Duty 30 Mil, Top-of-Joist System, US Patent. - Image 1](https://m.media-amazon.com/images/I/61f3hsW3zFL.jpg) ![Under Deck Drainage System, 50 FT Roll with 12 in Joist, 3-in-1 Waterproof Membrane with Built-in Self-Flashing & Self-Funnel, Heavy-Duty 30 Mil, Top-of-Joist System, US Patent. - Image 2](https://m.media-amazon.com/images/I/61vHZrmNzVL.jpg) ![Under Deck Drainage System, 50 FT Roll with 12 in Joist, 3-in-1 Waterproof Membrane with Built-in Self-Flashing & Self-Funnel, Heavy-Duty 30 Mil, Top-of-Joist System, US Patent. - Image 3](https://m.media-amazon.com/images/I/7125SPeElgL.jpg) ![Under Deck Drainage System, 50 FT Roll with 12 in Joist, 3-in-1 Waterproof Membrane with Built-in Self-Flashing & Self-Funnel, Heavy-Duty 30 Mil, Top-of-Joist System, US Patent. - Image 4](https://m.media-amazon.com/images/I/81Feln-tAeL.jpg) ![Under Deck Drainage System, 50 FT Roll with 12 in Joist, 3-in-1 Waterproof Membrane with Built-in Self-Flashing & Self-Funnel, Heavy-Duty 30 Mil, Top-of-Joist System, US Patent. - Image 5](https://m.media-amazon.com/images/I/715Xp3s7sDL.jpg) ## Frequently Bought Together - Under Deck Drainage System -Z/50/12-50 feet Long Roll, for 12 inches Joist Spacing, 30 Mil Thick Black Trough Top Side, Down Site is White, Create Dry Below Deck Storage - Under Deck Drainage System -Z/50/16-50 feet Long Roll, for 16 inches Joist Spacing, 30 Mil Thick Trough, top Side Black + Down Side White. - E-SDS Joist Tape for Decking,1 5/8" X 50'*10 Roll Butyl Tape Deck Joist Flashing Tape Anticorrosive Waterproof Deck Tape --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.at/products/115136677-under-deck-drainage-system-50-ft-roll-with-12-in](https://www.desertcart.at/products/115136677-under-deck-drainage-system-50-ft-roll-with-12-in) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-08-17*