--- product_id: 220859386 title: "ARDEX FLEXBONE UI 740 Anti-Fracture Uncoupling Membrane 1/8\" 215 SqFt Roll" brand: "ardex" price: "€ 1038.53" currency: EUR in_stock: true reviews_count: 1 category: "Ardex" url: https://www.desertcart.sk/products/220859386-ardex-flexbone-ui-740-anti-fracture-uncoupling-membrane-1-8 store_origin: SK region: Slovakia --- # Waterproof-capable with seam treatment Bone-shaped GripLock studs for max bond Extra-heavy load rating for high-traffic floors ARDEX FLEXBONE UI 740 Anti-Fracture Uncoupling Membrane 1/8" 215 SqFt Roll **Brand:** ardex **Price:** € 1038.53 **Availability:** ✅ In Stock ## Summary > 🦴 Lock in strength, unlock lasting floors! ## Quick Answers - **What is this?** ARDEX FLEXBONE UI 740 Anti-Fracture Uncoupling Membrane 1/8" 215 SqFt Roll by ardex - **How much does it cost?** € 1038.53 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/220859386-ardex-flexbone-ui-740-anti-fracture-uncoupling-membrane-1-8) ## 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 - • **Versatile for Any Space:** Rated Extra Heavy, it’s engineered for demanding commercial and residential environments—from gyms and hotels to kitchens and basements. - • **Built-In Waterproof Defense:** With proper seam treatment, this membrane doubles as a waterproof barrier, perfect for bathrooms, kitchens, and wet zones—keeping your floors pristine and worry-free. - • **Vapor Pressure Equalization:** Innovative felt backing with ventilation channels balances vapor pressure over concrete and wood subfloors, preventing moisture damage and extending floor life. - • **Unmatched Load-Bearing Strength:** Flexbone UI 740’s bone-shaped studs lock mortar in one pass, ensuring a rock-solid tile foundation that withstands heavy foot traffic and prevents cracks. - • **Effortless Installation & Superior Coverage:** Flexible, lays flat without stapling, and offers nearly double the coverage of competitors—saving time, money, and hassle on every project. ## Overview ARDEX Flexbone UI 740 is a premium 1/8" thick uncoupling membrane designed to prevent tile and grout cracking by absorbing substrate movement. Featuring patented bone-shaped GripLock studs for a superior mortar bond, it supports heavy loads and equalizes vapor pressure with a ventilated felt backing. Waterproof-capable with proper seam treatment, it’s ideal for high-traffic commercial and residential floors including wet areas. Flexible and easy to install, it delivers professional-grade durability and coverage, trusted by contractors and DIYers alike. ## Description ARDEX Flexbone UI 740 is a high load-bearing uncoupling and crack-isolation membrane for tile flooring, 1/8 in (3 mm) thick and made in Germany. Bonded to the prepared subfloor with polymer-modified thin-set mortar, it protects ceramic, porcelain, quarry and natural stone tile from lateral movement, substrate shifts and existing cracks that lead to tile or grout failure. Its bone-shaped stud pattern with GripLock technology accepts thin-set in one pass; as the mortar cures, the undercut studs lock in mechanically for an extremely strong mortar-to-membrane bond. The stud structure distributes heavy loads, supports the tile and absorbs lateral shear movement, extending tile and grout-joint life. A felt backing with integrated ventilation channels equalizes vapor pressure, a critical factor over wood and concrete subfloors and in basement renovations, helping support long-term floor performance. With proper seam treatment, UI 740 also provides waterproofing for wet areas. Rated Extra Heavy for load bearing, it suits high-stress residential and commercial spaces such as shops, restaurants, kitchens, hallways, gyms, offices, hotels, hospitals and food courts. It works with ceramic tile, porcelain tile, cement tile, marble tile, granite tile and natural stone in bathrooms, kitchens, basements, retail and hospitality floors, indoors. It is well suited to both professional contractors and confident do-it-yourself homeowners. It represents a practical, cost-effective choice for a wide range of interior and, where applicable, exterior projects. Careful handling and correct installation help maximize its performance and service life. Consistent quality and reliable performance are built into every unit for lasting value. It is engineered to deliver dependable, professional results on every project. Trusted by tradespeople and homeowners alike, it is made to perform job after job. Review: Best membrane! - I’m very happy with the ARDEX FLEXBONE membrane. Having worked with Schluter Ditra before, I can confidently say that ARDEX is much easier to work with. It’s more flexible, lays flat without any need for stapling, and for the price, you get almost twice the coverage compared to Schluter. Great product! Best regards, Max I’m very happy with the ARDEX FLEXBONE membrane. Having worked with Schluter Ditra before, I can confidently say that ARDEX is much easier to work with. It’s more flexible, lays flat without any need for stapling, and for the price, you get almost twice the coverage compared to Schluter. Great product! ## Features - Load-bearing uncoupling: Flexbone UI 740 bonds to the subfloor and uncouples tile to help prevent cracked tile and grout in heavy-traffic floors, for lasting value and dependable results. - Waterproof-capable: With proper seam treatment it adds a waterproof layer for wet areas such as bathrooms, showers and kitchens, for new construction and renovation work alike. - Griplock studs: Bone-shaped studs fill with thin-set in one pass and lock in mechanically for an extremely strong mortar-to-membrane bond, for a clean, professional and long-lasting finish. - Vapor equalization: A felt backing with ventilation channels equalizes vapor pressure over concrete and wood subfloors, including basements, for new construction and renovation work alike. - Extra-heavy rated: For ceramic tile, porcelain tile, marble tile, granite tile and natural stone in shops, restaurants, gyms, hotels and commercial spaces. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B089HT8PJB | | Best Sellers Rank | #846,987 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #266 in Flooring Underlayments | | Brand | Ardex | | Brand Name | Ardex | | Coverage | 215 sq ft | | Customer Reviews | 5.0 out of 5 stars 6 Reviews | | Item Dimensions L x W | 39"W | | Item Thickness | 0.13 inches | | Manufacturer | Ardex | | Manufacturer Part Number | UI 740 | | Material | Other | | Material Type | Other | | Model Number | UI 740 | | Number of Items | 1 | | Number of Packs | 1 | | Product Dimensions | 39"W | | 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 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 See more | | UPC | 709850006223 | | Unit Count | 1 Count | ## Product Details - **Brand:** Ardex - **Item Thickness:** 0.13 inches - **Material:** Other - **Product Dimensions:** 39"W ## Images ![ARDEX FLEXBONE UI 740 Anti-Fracture Uncoupling Membrane 1/8" 215 SqFt Roll - Image 1](https://m.media-amazon.com/images/I/51Jw91DCjKL.jpg) ![ARDEX FLEXBONE UI 740 Anti-Fracture Uncoupling Membrane 1/8" 215 SqFt Roll - Image 2](https://m.media-amazon.com/images/I/610vfIReSbL.jpg) ![ARDEX FLEXBONE UI 740 Anti-Fracture Uncoupling Membrane 1/8" 215 SqFt Roll - Image 3](https://m.media-amazon.com/images/I/81AL3Y2t7lL.jpg) ![ARDEX FLEXBONE UI 740 Anti-Fracture Uncoupling Membrane 1/8" 215 SqFt Roll - Image 4](https://m.media-amazon.com/images/I/51kbcDeFP4L.jpg) ![ARDEX FLEXBONE UI 740 Anti-Fracture Uncoupling Membrane 1/8" 215 SqFt Roll - Image 5](https://m.media-amazon.com/images/I/81J-IJyo5FL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Best membrane! *by M***X on October 5, 2024* I’m very happy with the ARDEX FLEXBONE membrane. Having worked with Schluter Ditra before, I can confidently say that ARDEX is much easier to work with. It’s more flexible, lays flat without any need for stapling, and for the price, you get almost twice the coverage compared to Schluter. Great product! Best regards, Max I’m very happy with the ARDEX FLEXBONE membrane. Having worked with Schluter Ditra before, I can confidently say that ARDEX is much easier to work with. It’s more flexible, lays flat without any need for stapling, and for the price, you get almost twice the coverage compared to Schluter. Great product! ## 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.sk/products/220859386-ardex-flexbone-ui-740-anti-fracture-uncoupling-membrane-1-8](https://www.desertcart.sk/products/220859386-ardex-flexbone-ui-740-anti-fracture-uncoupling-membrane-1-8) --- *Product available on Desertcart Slovakia* *Store origin: SK* *Last updated: 2026-09-15*