--- product_id: 220859386 title: "ARDEX FLEXBONE UI 740 Anti-Fracture Uncoupling Membrane 1/8\" 215 SqFt Roll | Crack Isolation Waterproof Polyethylene Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas" brand: "ardex" price: "₨21842" currency: SCR in_stock: true reviews_count: 1 url: https://www.desertcart.sc/products/220859386-ardex-flexbone-ui-740-anti-fracture-uncoupling-membrane-1-8 store_origin: SC region: Seychelles --- # Waterproof-capable with seam treatment Bone-shaped GripLock studs for max bond Extra-heavy load bearing for high traffic ARDEX FLEXBONE UI 740 Anti-Fracture Uncoupling Membrane 1/8" 215 SqFt Roll | Crack Isolation Waterproof Polyethylene Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas **Brand:** ardex **Price:** ₨21842 **Availability:** ✅ In Stock ## Summary > 🦴 Lock in strength, unlock lasting style. ## Quick Answers - **What is this?** ARDEX FLEXBONE UI 740 Anti-Fracture Uncoupling Membrane 1/8" 215 SqFt Roll | Crack Isolation Waterproof Polyethylene Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas by ardex - **How much does it cost?** ₨21842 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sc](https://www.desertcart.sc/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 - • **Waterproof Confidence:** Add a reliable waterproof layer for wet zones—bathrooms, kitchens, and showers—without compromise. - • **Vapor Pressure Equalization:** Felt backing with ventilation channels prevents moisture buildup, protecting subfloors and extending floor life. - • **Effortless Professional Finish:** Designed for seamless installation with polymer-modified thin-set mortar, delivering durable, crack-resistant floors. - • **Versatile High-Stress Solution:** Rated Extra Heavy for commercial and residential spaces—gyms, hotels, restaurants, and more. - • **Unmatched Load-Bearing Strength:** Flexbone UI 740’s bone-shaped studs lock mortar in one pass, ensuring a rock-solid tile foundation. ## Overview ARDEX Flexbone UI 740 is a premium 1/8" thick uncoupling membrane engineered in Germany to prevent tile and grout cracking in heavy-traffic areas. Featuring innovative bone-shaped GripLock studs, it creates a strong mechanical bond with mortar in a single pass. Its waterproof-capable design and vapor equalization backing make it ideal for wet and high-stress commercial or residential floors, supporting large format tiles like porcelain, marble, and granite. Trusted by pros and DIYers alike, it delivers durable, long-lasting tile installations with professional-grade performance. ## 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. ## 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 | #765,039 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #244 in Flooring Underlayments | | Brand Name | Ardex | | Coverage | 215 sq ft | | Customer Reviews | 5.0 5.0 out of 5 stars (6) 5.0 out of 5 stars | | 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 | | Number Of Items | 1 | | Number Of Packs | 1 | | 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 | | Unit Count | 1 Count | | Upc | 709850006223 | ## 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 | Crack Isolation Waterproof Polyethylene Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas - Image 1](https://m.media-amazon.com/images/I/51Jw91DCjKL.jpg) ![ARDEX FLEXBONE UI 740 Anti-Fracture Uncoupling Membrane 1/8" 215 SqFt Roll | Crack Isolation Waterproof Polyethylene Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas - Image 2](https://m.media-amazon.com/images/I/610vfIReSbL.jpg) ![ARDEX FLEXBONE UI 740 Anti-Fracture Uncoupling Membrane 1/8" 215 SqFt Roll | Crack Isolation Waterproof Polyethylene Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas - Image 3](https://m.media-amazon.com/images/I/81AL3Y2t7lL.jpg) ![ARDEX FLEXBONE UI 740 Anti-Fracture Uncoupling Membrane 1/8" 215 SqFt Roll | Crack Isolation Waterproof Polyethylene Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas - Image 4](https://m.media-amazon.com/images/I/51kbcDeFP4L.jpg) ![ARDEX FLEXBONE UI 740 Anti-Fracture Uncoupling Membrane 1/8" 215 SqFt Roll | Crack Isolation Waterproof Polyethylene Load Bearing Underlayment for Large Format Tiles in Heavy Stress Areas - 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 on Reviewed in the United States 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,MaxI’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.sc/products/220859386-ardex-flexbone-ui-740-anti-fracture-uncoupling-membrane-1-8](https://www.desertcart.sc/products/220859386-ardex-flexbone-ui-740-anti-fracture-uncoupling-membrane-1-8) --- *Product available on Desertcart Seychelles* *Store origin: SC* *Last updated: 2026-08-21*