Foam Roofing Underlayment With Touch Fasteners for Wind Uplift
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Solution Overview
Problem
Current roofing constructions face challenges in providing cost-effective installation while maintaining uplift load resistance and retaining exterior construction materials like shingles and siding, especially under severe environmental conditions such as high winds and hail.
Innovation Solution
A construction underlayment featuring a rigid foam board with a reinforcing facing of flexible resin membrane and an array of touch fastener elements, which are bonded to the foam board and extend across its broadest sides, providing enhanced adhesion and resistance to uplift forces through a combination of mechanical and chemical bonding mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional roofing constructions are used, then installation is simpler and less expensive, but uplift load resistance is insufficient under severe environmental conditions
Solution Approach 1:
The patent employs composite materials by bonding a flexible resin membrane to a rigid foam board to create a unified underlayment assembly. This composite structure combines the flexibility and adhesion properties of the resin membrane with the rigid structural support of the foam board, achieving superior uplift load resistance while maintaining installation efficiency through integration of multiple functions into a single composite unit.
Solution Approach 2:
The underlayment is segmented into discrete foam board units with integrated resin membranes, allowing for modular installation. This segmentation enables easier handling and placement during installation while maintaining the structural integrity and uplift resistance of the complete assembly when properly bonded together.
2Strength
If conventional bonding methods are used, then material cost is lower, but adhesion strength under wind uplift is insufficient
Solution Approach 1:
The patent merges the bonding function with the structural membrane by integrating the resin membrane directly onto the foam board during manufacturing. This combination eliminates the need for separate bonding operations and materials, achieving superior adhesion strength through the integrated resin-foam interface while controlling manufacturing costs through process consolidation.
Solution Approach 2:
The resin membrane is pre-bonded to the foam board during manufacturing before installation. This preliminary action ensures that the bonding interface is already prepared and optimized for uplift resistance, eliminating the need for additional bonding steps during installation and ensuring consistent adhesion quality across the entire underlayment assembly.
3Reliability
If simple fastening methods are used, then installation speed is faster, but retention of exterior materials under hail and wind is insufficient
Solution Approach 1:
The patent changes the fastening mechanism from simple mechanical attachment to a multi-functional system where the resin membrane provides continuous adhesive bonding across the entire foam board surface. This parameter change from discrete fastening points to continuous bonding area significantly improves retention reliability under hail and wind loads while maintaining installation efficiency through the self-bonding properties of the resin system.
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 solution effectively secures roofing membranes and siding, enhancing their ability to withstand uplift forces and hail impacts, maintaining engagement between the membrane and foam board, and preventing separation initiation points during wind uplift loading.
Implementation Method 1
a reinforcing facing including a flexible base bonded across one of the broadest board sides
Implementation Method 2
an array of touch fastener elements extending from the base and exposed for engagement
Data Source
AI summary
A foam roofing underlayment is provided with a reinforcement membrane having an array of fastener elements for engaging fastener elements on a flexible roof membrane. The underlayment is formed by molding foam between the reinforcement membrane and a carrier membrane. The underlayment in secured to the roof using washers having fastener elements for engaging the fastener elements of the flexible roof membrane. An anti-peel flap with fastener elements is provided around the periphery of the washers. A slip sheet is used between the underlayment and the flexible roof membrane to permit accurate positioning of the flexible roof membrane prior to engagement of the fastener elements. The interstices between the fastener elements provide lateral moisture paths to vents in the flexible roof membrane.