--- 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: "S/.3235" currency: PEN in_stock: true category: "Ardex" url: https://www.desertcart.pe/products/220859386-ardex-flexbone-ui-740-uncoupling-waterproofing-polyethylene-membrane-215-sq store_origin: PE region: Peru --- # 215 sq ft coverage 1/8" thick durable membrane 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:** S/.3235 **Availability:** ✅ In Stock ## Summary > 🛠️ Elevate your floors with FLEXBONE — where durability meets precision innovation! ## 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?** S/.3235 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pe](https://www.desertcart.pe/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 - • **Heavy-Duty Load Bearing:** Rated for extra heavy traffic, perfect for commercial and high-stress residential spaces. - • **Vapor Equalization Mastery:** Built-in ventilation channels and high-performance felt balance vapor pressure to prevent moisture damage. - • **Precision German Engineering:** Crafted in Germany for superior quality and reliability in every square inch. - • **Unmatched Coverage Efficiency:** One roll covers a generous 215 sq ft, minimizing waste and maximizing project speed. - • **Advanced Uncoupling Technology:** Bone-shaped stud pattern locks thinset mortar for rock-solid tile adhesion and crack prevention. ## Overview The ARDEX FLEXBONE UI 740 is a premium uncoupling and waterproofing membrane designed for large format tile installations in heavy traffic areas. Covering 215 sq ft per roll with a robust 1/8" thickness, it features a unique bone-shaped stud pattern for superior mortar adhesion and crack isolation. Engineered in Germany, it offers vapor equalization through ventilation channels and high-performance felt, ensuring long-lasting tile protection in both commercial and residential environments. ## 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 | #696,300 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #216 in Flooring Underlayments | | Brand Name | Ardex | | Coverage | 215 sq ft | | Customer Reviews | 5.0 5.0 out of 5 stars (6) | | Item Dimensions L x W | 39"W | | Item Thickness | 0.13 Inches | | Manufacturer | Ardex | | Manufacturer Part Number | UI 740 | | Material Type | Other | | Model Number | UI 740 | | Recommended Uses For Product | Tile underlayment for large format tiles in heavy stress areas, commercial and residential spaces including shops, restaurants, kitchens, hallways, gyms, offices, foyers, hotels, hospitals, and food courts | | UPC | 709850006223 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** Ardex - **Item Thickness:** 0.13 Inches - **Material:** Other - **Product Dimensions:** 39"W ## 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) ## Available Options This product comes in different **Size** options. ## 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? - 🛒 **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.pe/products/220859386-ardex-flexbone-ui-740-uncoupling-waterproofing-polyethylene-membrane-215-sq](https://www.desertcart.pe/products/220859386-ardex-flexbone-ui-740-uncoupling-waterproofing-polyethylene-membrane-215-sq) --- *Product available on Desertcart Peru* *Store origin: PE* *Last updated: 2026-07-21*