Flooring Underlayment Membrane Moisture and Crack Isolation
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Solution Overview
Problem
Tile and stone floors installed directly on concrete slabs are prone to cracking due to moisture and foundation shifts, leading to costly replacements or remedial work, necessitating the use of specialized membranes that pass stringent test requirements for waterproofing and crack isolation.
Innovation Solution
A flooring underlayment membrane comprising upper and lower nonwoven fiber layers bonded with extrudable thermoplastic resin, which functions as both a waterproof and crack isolation membrane, manufactured using a wet-laid process with synthetic fibers and polymer latex binder, and applied in a laminate structure to reduce moisture vapor emission and prevent cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tile and stone floors are installed directly on concrete slabs, then installation cost and time are reduced, but cracking occurs due to moisture and foundation shifts
Solution Approach 1:
The flooring system is segmented into distinct functional layers: the concrete slab, the underlayment membrane (itself composed of multiple nonwoven fiber layers bonded with thermoplastic resin), and the tile flooring. This segmentation allows each layer to perform its specific function - the membrane isolates cracks and moisture while the tile provides the finished surface, resolving the contradiction between quick installation and long-term durability.
Solution Approach 2:
The underlayment membrane is constructed as a composite material system combining natural fiber nonwoven layers with thermoplastic resin bonding agents. This composite structure provides both the mechanical strength needed for crack isolation and the moisture barrier properties required for waterproofing, enabling the floor to withstand foundation shifts while maintaining installation efficiency.
2Reliability
If separate waterproof and crack isolation membranes are used, then protection against moisture and cracking is improved, but device complexity and installation time increase
Solution Approach 1:
The patent merges the functions of separate waterproof membranes and crack isolation membranes into a single integrated underlayment membrane. This combined membrane incorporates both moisture barrier properties and crack isolation capabilities through its multi-layer nonwoven fiber construction bonded with thermoplastic resin, eliminating the need for multiple separate layers and simplifying the overall flooring system.
Solution Approach 2:
The underlayment membrane is designed as a universal solution that performs multiple functions simultaneously: it acts as a moisture barrier, provides crack isolation, and serves as an adhesive substrate for tile installation. This multi-functionality consolidates what would traditionally require separate specialized membranes into a single product, reducing complexity while maintaining comprehensive protection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The membrane effectively prevents moisture-related issues and cracking, passing ANSI A118.10 and A118.12 tests, providing a lightweight, solvent-free solution that is easy to install and offers combined waterproof and crack isolation benefits, reducing the need for separate membranes and minimizing replacement costs.
Implementation Method 1
at least one layer of extrudable thermoplastic resin disposed between and bonding the first and second nonwoven fiber mats
Implementation Method 2
the membrane has a moisture vapor emission rate of less than 3 lb/1000 ft2/24 hr, when measured with a relative humidity gradient from 100% R.H. to 0% R.H.
Data Source
AI summary
Disclosed herein is a flooring underlayment membrane, and associated methods of manufacturing and installing such a membrane, comprising upper and lower nonwoven fiber layers. In one embodiment, the flooring underlayment membrane constructed as disclosed herein may comprise a first nonwoven fiber material, and a second nonwoven fiber material and at least one layer of extrudable thermoplastic resin disposed between and bonding the first and second nonwoven fiber materials.