--- product_id: 69517418 title: "Under Deck Drainage System, 50 FT Roll with 16 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: "3597 kr" currency: NOK in_stock: true category: "Goberco" url: https://www.desertcart.no/products/69517418-under-deck-drainage-system-50-ft-roll-with-16-in store_origin: NO region: Norway --- # Patented Z-Fold drainage channel 50 ft roll, perfect 16 in joist fit 30 mil heavy-duty waterproof membrane Under Deck Drainage System, 50 FT Roll with 16 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:** 3597 kr **Availability:** ✅ In Stock ## Summary > 💧 Keep your deck dry, your space stylish, and your neighbors wondering how you did it! ## Quick Answers - **What is this?** Under Deck Drainage System, 50 FT Roll with 16 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?** 3597 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.no](https://www.desertcart.no/products/69517418-under-deck-drainage-system-50-ft-roll-with-16-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 - • **Top-of-Joist Installation:** Innovative mounting on joist tops protects framing and maximizes water diversion efficiency. - • **No Proprietary Parts Needed:** Compatible with standard gutters and downspouts—save money and avoid specialty accessories. - • **Industrial-Grade Waterproofing:** 30 mil thick LLDPE membrane ensures unmatched durability and weather resistance for years of dry comfort. - • **Patent-Protected Z-Fold Design:** Unique 3.5" deep drainage channel and integrated funnel minimize leaks at critical ledger and rim joists. - • **Precision Fit for 16-Inch Joists:** Engineered roll width (17.25") matches standard joist spacing for a seamless, waste-free install. ## Overview The Under Deck Drainage System is a 50 ft roll of heavy-duty 30 mil black polyethylene membrane designed for 16-inch joist spacing. Featuring a patented Z-Fold drainage channel and self-flashing capabilities, it installs on top of joists to protect deck framing and create a dry, usable space beneath. Compatible with standard gutters and downspouts, this US-patented system offers a durable, cost-effective solution for moisture management and outdoor living enhancement. ## Description Z/50/16 - Each roll is 50' long x 17 1/4'' width (for 16 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 under 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 against rim 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. ## Features - CREATE A DRY SPACE BELOW YOUR DECK : Capture and redirect rainwater before it reaches the area beneath your deck. Perfect for creating a dry patio, storage area, workshop, or outdoor living space while helping protect your deck structure from moisture exposure - DESIGNED FOR 16 IN. JOIST SPACING: Each 50 ft roll is precision-sized to fit decks with standard 12 in. on-center joist spacing, helping simplify installation and reduce waste. - HEAVY-DUTY 30 MIL WATERPROOF MEMBRANE: Made from durable black polyethylene for exceptional strength, weather resistance, and long-lasting performance. - TOP-OF-JOIST INSTALLATION FOR SUPERIOR PROTECTION :Unlike many under-deck systems installed below the framing, Goberco mounts directly on top of sloped joists to help keep both the framing and under-deck area dry. The patented design also allows the membrane to act as flashing against the house wall. - NO PROPRIETARY ACCESSORIES REQUIRED: Uses standard gutters and standard downspouts available at most hardware stores. No expensive proprietary funnels, specialty downspouts, or brand-specific drainage components required. - PATENTED Z-FOLD DESIGN HELPS REDUCE LEAKS :U.S. Patent #9,453,338 features a 3.5 in deep drainage channel between joists and an integrated funnel design that efficiently directs water toward the gutter while helping reduce common leak points at the ledger board and rim joist. - HEAVY-DUTY INDUSTRIAL-GRADE MEMBRANE – Made from 30 mil thick Linear Low-Density Polyethylene (LLDPE) manufactured to ASTM standards for long-lasting waterproof performance. Each roll measures 50 ft long x 17.25 in wide for 16 in joist spacing. Made in Canada and designed for easy DIY or professional installation. - EASY TO INSTALL: 1. Staple on top of joists 2. Self sealing tape over joints 3. Screw downspouts to water evacuation holes. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00STPXKLY | | Best Sellers Rank | #445,786 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #379 in Gutter Downspouts | | Color | Black/White | | Customer Reviews | 4.1 4.1 out of 5 stars (217) | | Date First Available | January 27, 2015 | | Item Package Quantity | 1 | | Item Weight | 11.88 pounds | | Item model number | 1725503016 | | Manufacturer | Goberco Building Products inc. | | Material | 30 mils thick linear low density polyethylene industrial grade ASTM | | Part Number | 20130001 | | Product Dimensions | 50 x 17.25 x 18 inches | | Size | 50 FT / 16 in | | Special Features | US patented Z-Fold act as water evacuation channel between the deck joists | ## Images ![Under Deck Drainage System, 50 FT Roll with 16 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/61zoeTMVCiL.jpg) ![Under Deck Drainage System, 50 FT Roll with 16 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/710sOfvr2fL.jpg) ![Under Deck Drainage System, 50 FT Roll with 16 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/81jwlVekmFL.jpg) ![Under Deck Drainage System, 50 FT Roll with 16 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/7125SPeElgL.jpg) ![Under Deck Drainage System, 50 FT Roll with 16 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/711VzqUfTiL.jpg) ## Questions & Answers **Q: how do you deal with water at the fashia end of the joist run? I do not see down spouts listed** A: At the end of the joist bay staple the membrane on top of rim joist then make a hole. Attach a piece of gutter downspout ( about 8'' long ) to this hole, make sure each downspout piece drops far enough into the gutter to prevent wind from pushing water off the gutter. Please see installation video on GOBERCO's website. **Q: How do you account for accumulation of leaves, pine needles & helicopters falling from trees?** A: I usually account them one at a time. But to wash them away i have placed a drain system that allows removal. Just cut 4inch holes in a line opposite joist. Then place gutter under holes. Use gutter downspout pipe to direct flow into gutter. Then when accumulation occurs wash down, then slide out downspout pieces leaves and helicopters fall out. Been working for me. **Q: Is this material non-combustible or a class b fire rated material? I need it to pass hfz code in riverside county ca** A: Hello, NFPA Flammability rating is 1 (Slight), please send us an email then we will forward you the spec date sheet. Thank you. **Q: How many joist will a 50 foot roll do** A: For example a 50' roll will cover 4 joist bay of 12' long ( 12 x 4 = 48 ). If your joist are 16' long a roll can make 3 joist bay ( 16 x 3 = 48 ). ## Frequently Bought Together - 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. - Deck Flash Barrier, 3-In. x 75-Ft. - RainEscape Deck Drainage System Downspout - Black --- ## 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.no/products/69517418-under-deck-drainage-system-50-ft-roll-with-16-in](https://www.desertcart.no/products/69517418-under-deck-drainage-system-50-ft-roll-with-16-in) --- *Product available on Desertcart Norway* *Store origin: NO* *Last updated: 2026-10-06*