---
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: "€ 967.85"
currency: EUR
in_stock: true
url: https://www.desertcart.gr/products/220859386-ardex-flexbone-ui-740-uncoupling-waterproofing-polyethylene-membrane-215-sq
store_origin: GR
region: Greece
---

# 215 sq ft coverage 1/8" thick durable membrane Unique bone-shaped stud pattern 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:** € 967.85
**Availability:** ✅ In Stock

## Summary

> 🛠️ Elevate your flooring game with ARDEX 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?** € 967.85 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/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

- • **Maximize Floor Protection:** Covers a generous 215 sq ft per roll, perfect for large projects without constant reordering.
- • **Vapor Equalization Mastery:** Ventilation channels and high-performance felt prevent moisture buildup, protecting floors from hidden damage.
- • **Engineered for Heavy Traffic:** Extra heavy load-bearing rating ensures tile integrity in busy commercial and residential spaces.
- • **Waterproof & Crack-Isolating:** Effectively uncouples tile from subfloor movement, preventing cracks and grout failure for long-lasting floors.
- • **Innovative Grip Lock Technology:** Bone-shaped studs lock thinset mortar in place with one pass, speeding installation and boosting adhesion.

## Overview

The ARDEX FLEXBONE UI 740 is a premium German-engineered uncoupling and waterproofing membrane designed for large format tile installations. Measuring 1/8" thick and covering 215 sq ft per roll, it features a unique bone-shaped stud pattern with grip lock technology for superior mortar adhesion. Its ventilation channels and high-performance felt provide essential vapor equalization, making it ideal for high-traffic commercial and residential areas prone to moisture and subfloor movement. This membrane ensures long-lasting tile protection by preventing cracks, buckling, and grout damage.

## Description

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

## 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 |
|---------------|-------|
| Manufacturer | Ardex |
| Part Number | UI 740 |
| Product Dimensions | 40 x 14 x 14 inches |
| Item model number | UI 740 |
| Size | 1 Roll |
| Material | Other |
| Item Package Quantity | 1 |

## 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 Name** options.

## Frequently Bought Together

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-03-05*