--- 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: "S$168" currency: SGD in_stock: true reviews_count: 8 category: "Goberco" url: https://www.desertcart.sg/products/115136677-under-deck-drainage-system-50-ft-roll-with-12-in store_origin: SG region: Singapore --- # 3.5'' deep drainage channel 50 ft roll length 30 mil thick heavy-duty polyethylene 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:** S$168 **Availability:** ✅ In Stock ## Summary > 💧 Keep your deck dry and your storage worry-free with patented precision! ## 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?** S$168 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/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 - • **Universal Compatibility:** Works seamlessly with treated wood, cedar, and composite decking materials. - • **Cost-Effective Waterproofing:** Complete system at just $2/sq.ft.—save up to 66% vs competitors. - • **Proven Durability & Warranty:** Heavy-duty ASTM polyethylene with 20-year limited warranty—trusted across North America. - • **Patented Z-Fold Channel Design:** Unique flashing reduces leaks at ledger and rim joists for ultimate dryness. - • **Effortless Top-Joist Installation:** Staple, tape, and screw—done in minutes, no special tools needed. ## Overview The Under Deck Drainage System Z/50/12 is a 50-foot long, 30 mil thick heavy-duty polyethylene membrane designed for 12-inch joist spacing. Featuring a patented Z-Fold channel that acts as integrated flashing, it efficiently directs water away from your deck framing, preventing leaks and water damage. Easy to install with staple-on joist application, self-sealing tape, and standard downspouts, this cost-effective system offers superior durability and compatibility with various decking materials. Backed by a 20-year limited warranty and trusted by thousands across the USA and Canada, it’s the smart choice for creating dry, usable space beneath your deck. ## 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 white - 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 Review: As good a system as the other company! - We are installing a replacement deck and wanted to keep the porch below dry so we looked for options. I found this system and am very happy with it. First, it will cost 1/3 of most other under deck drainage systems. Instead of $50 a rafter for parts, this will cost about 15 for a 10 foot deck. The price is for a 50 foot roll so you cut to fit from that. The system does not require an expensive collector at the end, simply cut an X into the material and screw on a downspout connector, I added some butyl tape for extra security and water proofing but that isn't really necessary. The material is a stiff plastic which has a drain down the center bent into the material. Staple in place with a drop down to the outlet end and bend the end upward into place, you are done. Great material and really fast shipping! It was shipped the next day from Canada and was at my place in 3 days from ordering. Good company, great shipping excellent product! Review: Good, heavy duty product! Installation instructions could be better in my opinion. - Product seems.to be very durable. I would recommend as a 2 person installation. It may have been that I am a homeowner installing this and not a contractor. In my opinion, the installation directions were alittle lacking and could be improved on, but as stated before, the product I'm happy with, and would recommend. ## 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 | | Batteries Included? | No | | Batteries Required? | No | | Best Sellers Rank | #746,279 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #393 in Roofing Gutters #559 in Gutter Downspouts #161,101 in Hardware | | Color | top side black , back side is black or grey | | Customer Reviews | 4.0 4.0 out of 5 stars (47) | | Date First Available | October 18, 2018 | | Is Discontinued By Manufacturer | No | | Item Weight | 10.28 pounds | | Item model number | 1725503016 | | Manufacturer | Goberco Building Products inc. | | Part Number | 20130003 | | Power Source | manual | | Product Dimensions | 10 x 10 x 14 inches | | Size | 50' long roll-for 12'' joist spacing-30 mil lldpe | ## 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/61uJhIgIDAL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ As good a system as the other company! *by G***Y on July 25, 2024* We are installing a replacement deck and wanted to keep the porch below dry so we looked for options. I found this system and am very happy with it. First, it will cost 1/3 of most other under deck drainage systems. Instead of $50 a rafter for parts, this will cost about 15 for a 10 foot deck. The price is for a 50 foot roll so you cut to fit from that. The system does not require an expensive collector at the end, simply cut an X into the material and screw on a downspout connector, I added some butyl tape for extra security and water proofing but that isn't really necessary. The material is a stiff plastic which has a drain down the center bent into the material. Staple in place with a drop down to the outlet end and bend the end upward into place, you are done. Great material and really fast shipping! It was shipped the next day from Canada and was at my place in 3 days from ordering. Good company, great shipping excellent product! ### ⭐⭐⭐⭐ Good, heavy duty product! Installation instructions could be better in my opinion. *by J***. on December 26, 2019* Product seems.to be very durable. I would recommend as a 2 person installation. It may have been that I am a homeowner installing this and not a contractor. In my opinion, the installation directions were alittle lacking and could be improved on, but as stated before, the product I'm happy with, and would recommend. ### ⭐⭐⭐⭐⭐ Descent product *by T***R on October 15, 2022* Definitely use 4” tape (BLACK). Use longest staples your gun will staple. Cannot use compressed air stapler in my experience. Will significantly warp and twist in high temps during install. Try to have done in one day. On long runs (I did 16’) maybe not the best product. Mine is pooling in the middle. I cannot imagine running a 16’ elevated deck at a 2 degree downslope which would put constant tension on the house rim joist. Make sure to use lateral bracing if so. I’m no engineer, but… ## 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? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sg/products/115136677-under-deck-drainage-system-50-ft-roll-with-12-in](https://www.desertcart.sg/products/115136677-under-deck-drainage-system-50-ft-roll-with-12-in) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-07-07*