--- product_id: 220859386 title: "ARDEX FLEXBONE UI 740 Uncoupling Waterproofing Polyethylene Membrane 215 Sq Ft Roll, 1/8\" Thick, Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas -1 Roll" brand: "ardex" price: "3356 zΕ‚" currency: PLN in_stock: true reviews_count: 1 category: "Ardex" url: https://www.desertcart.pl/products/220859386-ardex-flexbone-ui-740-uncoupling-waterproofing-polyethylene-membrane-215-sq store_origin: PL region: Poland --- # Waterproof & vapor equalizing 215 sq ft coverage Extra heavy load bearing ARDEX FLEXBONE UI 740 Uncoupling Waterproofing Polyethylene Membrane 215 Sq Ft Roll, 1/8" Thick, Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas -1 Roll **Brand:** ardex **Price:** 3356 zΕ‚ **Availability:** βœ… In Stock ## Summary > πŸ› οΈ Elevate your floors with German-engineered strength and style! ## Quick Answers - **What is this?** ARDEX FLEXBONE UI 740 Uncoupling Waterproofing Polyethylene Membrane 215 Sq Ft Roll, 1/8" Thick, Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas -1 Roll by ardex - **How much does it cost?** 3356 zΕ‚ with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/220859386-ardex-flexbone-ui-740-uncoupling-waterproofing-polyethylene-membrane-215-sq) ## Best For - ardex enthusiasts ## Why This Product - Trusted ardex brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Maximize Your Space:** One roll covers a generous 215 sq ft, nearly doubling coverage vs competitors. - β€’ **Humidity? No Problem:** Advanced ventilation channels and felt provide essential vapor equalization to prevent damage. - β€’ **Crack-Free Confidence:** Unique bone-shaped stud pattern locks mortar for superior tile adhesion and longevity. - β€’ **Built for High Traffic:** Extra heavy load rating ensures tile protection in busy commercial & residential zones. - β€’ **Effortless Installation:** Flexible, lays flat without staplingβ€”save time and avoid installation headaches. ## Overview The ARDEX FLEXBONE UI 740 is a premium 1/8" thick polyethylene uncoupling membrane designed for heavy-duty tile installations. Covering 215 sq ft per roll, it features a patented bone-shaped stud pattern for superior mortar grip and crack isolation. Waterproof and vapor equalizing, it excels in high-traffic commercial and residential areas, protecting tiles from subfloor movement and moisture damage. Made in Germany, it offers flexible, easy installation and industry-leading durability for lasting floor performance. ## Description The ARDEX UI 740 is a durable uncoupling crack isolation membrane for safe tile flooring installation. It lays over the subfloor below, which protects the tiles and surfaces above from harmful developments such as lateral movement, shifts, and existing cracks. With its load-bearing capabilities, this waterproofing membrane can be used to protect your tile and floors in heavy and high-traffic areas. Its ventilation channels and high-performance felt allow vapor pressure to equalize, which is an important factor in basement flooring renovation and for installation on wood and virgin concrete subfloors. Vapor equalization is vital where risks of humid emission are significant to prevent the formation of trapped water under the membrane. The distinct bone-shaped stud design of the membrane's surface readily accepts thinset mortar adhesive. As the adhesive dries, the undercuts on each stud enhance its grip, boosting adherence and reducing curing time. The studs support and protect the tiles above while improving flexibility and absorbing lateral shear movement. This improves tile and grout joint longevity and saves money on renovation. It is a durable crack-isolating and uncoupling membrane, protecting your floor tiles and other floor covering by preventing potential damage and reducing grout stress from the substrate below. ARDEX UI 740 works with a wide variety of surfaces - linoleum tiles, vinyl flooring, ceramic tile, porcelain tiles, cement tiles, marble tiles, natural stone tiles, granite, laminate flooring, concrete blocks, carpet tiles, existing tile, cracked surfaces, painted floors, and mixed substrates. The ARDEX UI 740, made in Germany, will exceed your DIY home improvement project demands - whether you're installing bathroom tile, shower tile, or building a floor for your bedroom, hallway, balcony, basement, kitchen, dining room, foyer, or any other living area, this uncoupling membrane will live up to the task. ## Features - The ARDEX FLEXBONE UI 740 underlayment membrane. One roll covers 215 Square Feet (20 Square Meters). 1/8" (3 mm) thick. 39" wide (1 m wide), 65.6' long (20 m long). Germany made - Effective uncoupling action protects your surfaces, tiles, and grout joints from cracking or buckling due to natural movements and changes in the subfloor caused by wetness and temperature shifts - The unique bone-shaped stud pattern fills with thinset mortar with just one pass, and its grip lock technology creates an extremely strong mortar-to-membrane bond for strong tile adhesion - Ventilation channels in the FLEXBONE pattern compensate for vapor, and special high performance felt helps provide vapor equalization. It also features waterproofing capabilities - Take advantage of the FLEXBONE 740's Extra Heavy load bearing rating to protect your tile in high-stress areas (commercial and residential) - shops, restaurants, kitchens, hallways, gyms, offices, foyers, hotels, hospitals, food courts, and other busy traffic areas ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B089HT8PJB | | Best Sellers Rank | #449,235 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #154 in Flooring Underlayments | | Customer Reviews | 5.0 5.0 out of 5 stars (6) | | Date First Available | June 1, 2020 | | Item Package Quantity | 1 | | Item model number | UI 740 | | Manufacturer | Ardex | | Material | Other | | Part Number | UI 740 | | Product Dimensions | 40 x 14 x 14 inches | | Size | 1 Roll | ## Images ![ARDEX FLEXBONE UI 740 Uncoupling Waterproofing Polyethylene Membrane 215 Sq Ft Roll, 1/8" Thick, Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas -1 Roll - Image 1](https://m.media-amazon.com/images/I/51Jw91DCjKL.jpg) ![ARDEX FLEXBONE UI 740 Uncoupling Waterproofing Polyethylene Membrane 215 Sq Ft Roll, 1/8" Thick, Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas -1 Roll - Image 2](https://m.media-amazon.com/images/I/610vfIReSbL.jpg) ![ARDEX FLEXBONE UI 740 Uncoupling Waterproofing Polyethylene Membrane 215 Sq Ft Roll, 1/8" Thick, Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas -1 Roll - Image 3](https://m.media-amazon.com/images/I/81AL3Y2t7lL.jpg) ![ARDEX FLEXBONE UI 740 Uncoupling Waterproofing Polyethylene Membrane 215 Sq Ft Roll, 1/8" Thick, Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas -1 Roll - Image 4](https://m.media-amazon.com/images/I/81J-IJyo5FL.jpg) ![ARDEX FLEXBONE UI 740 Uncoupling Waterproofing Polyethylene Membrane 215 Sq Ft Roll, 1/8" Thick, Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas -1 Roll - Image 5](https://m.media-amazon.com/images/I/81cuXCGsUlL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by M***X on October 5, 2024* ## Frequently Bought Together - ARDEX FLEXBONE UI 740 Uncoupling Waterproofing Polyethylene Membrane 215 Sq Ft Roll, 1/8" Thick, Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas -1 Roll - Schluter Kerdi-Drain PVC Shower Flange Kit with Preformed Waterproofing Corners - Ideal for New and Renovation Projects - 2-Inch Outlet, Easy Installation - KD2FLKPVC - Schluter Kerdi Band Waterproofing Strip - Ideal for Sealing Butt Joints and Floor/Wall Connections - 33' Length, 5" Width, 4 mil Thickness - KEBA100/125/10M --- ## 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.pl/products/220859386-ardex-flexbone-ui-740-uncoupling-waterproofing-polyethylene-membrane-215-sq](https://www.desertcart.pl/products/220859386-ardex-flexbone-ui-740-uncoupling-waterproofing-polyethylene-membrane-215-sq) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-05-10*