Membrane Roofing Underlayment for Wind Uplift Resistance
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Solution Overview
Problem
Current roofing constructions face challenges in cost-effective installation and satisfactory uplift load resistance, particularly for membrane roofs and exterior construction materials like shingles and siding, which are prone to wind uplift and hail damage.
Innovation Solution
A construction underlayment system featuring a rigid foam board with a reinforcing facing of flexible resin membrane and an array of touch fastener elements, which provides enhanced bonding and load transfer, including a tie layer with glass fibers for improved dimensional stability and fire resistance, and the use of touch fastener materials on both sides of the foam board for increased hail damage resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional roofing constructions are used, then installation is simpler and less costly, but uplift load resistance is insufficient
Solution Approach 1:
The patent employs composite materials by combining rigid foam boards with fabric reinforcements and adhesive layers to create a multi-layered underlayment system. This composite structure integrates the insulating properties of foam with the tensile strength of fabric and the bonding capability of adhesive, thereby enhancing uplift load resistance while maintaining construction feasibility
Solution Approach 2:
The underlayment is segmented into discrete rigid foam boards with integrated fabric reinforcements rather than using a continuous membrane system. This segmentation allows for easier handling, installation, and integration with the roofing structure, reducing construction complexity while maintaining structural integrity against uplift forces
2Temperature
If membrane roofing is used, then thermal barrier properties are improved, but wind uplift resistance deteriorates
Solution Approach 1:
The patent creates a composite underlayment system that combines rigid foam boards (providing thermal insulation) with fabric reinforcements and adhesive layers (providing wind uplift resistance). This composite structure allows simultaneous achievement of thermal barrier properties and wind uplift resistance by integrating materials with complementary functions
Solution Approach 2:
The fabric reinforcement is selectively applied to the rigid foam boards at locations where uplift resistance is most critical, such as along seams and edges. This local reinforcement approach maintains thermal insulation properties in non-critical areas while providing enhanced strength where needed
3Temperature
If rigid foam boards are used, then thermal insulation is improved, but dimensional stability under environmental forces deteriorates
Solution Approach 1:
The patent combines rigid foam boards with fabric reinforcements to create a composite underlayment system. The fabric component provides dimensional stability by restraining the foam boards under environmental forces such as wind uplift and thermal expansion, while the foam core maintains thermal insulation properties
Solution Approach 2:
The fabric reinforcement is pre-integrated with the rigid foam boards during manufacturing, creating a stabilized composite unit before installation. This preliminary bonding ensures dimensional stability is established in advance, preventing deformation under subsequent environmental loading
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 to the roof deck, enhancing uplift load resistance and hail damage resistance, while maintaining engagement between the membrane and foam board, even under extreme conditions, thereby preventing separation and ensuring the integrity of the roofing system.
Implementation Method 1
a flexible resin membrane bonded across an upper surface of the board
Implementation Method 2
an array of touch fastener elements extending from the base and exposed for engagement
Implementation Method 3
a tie layer with glass fibers for improved dimensional stability and fire resistance
Implementation Method 4
rigid foam board having two broadest sides defining a thickness therebetween
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.