Rodent-Proof Drip Edge with Waterproof Fastener Seal
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Solution Overview
Problem
Conventional methods for excluding rodents and other animals from structures, such as those using thin aluminum drip edges, are ineffective as rodents can easily enter or chew through them, and existing solutions like metal flashing allow water penetration.
Innovation Solution
A multi-component device comprising an elongate drip edge with a consistent transverse cross section, including a deck facing section, overhanging section, fascia facing section, and drip edge section, along with a fastener assembly featuring a metal screw with a flexible seal element, designed to cover gaps between roof deck and fascia portions, preventing pest entry while keeping water out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thin aluminum drip edges are used, then cost is reduced and installation is simplified, but rodent exclusion effectiveness deteriorates as rodents can easily enter or chew through them
Solution Approach 1:
The invention uses galvanized steel drip edge material instead of thin aluminum, combining durability against rodent chewing with rust-resistant protective coating. This composite approach maintains ease of installation while dramatically improving rodent exclusion effectiveness through the material's resistance to being chewed through.
Solution Approach 2:
The invention changes the gauge thickness parameter of the drip edge material to a heavier, more rodent-resistant specification. By increasing the material thickness and strength parameters while maintaining the same installation methodology, the system achieves better rodent exclusion without sacrificing installation simplicity.
2Reliability
If metal flashing is used to exclude rodents, then rodent exclusion effectiveness is improved, but water exclusion deteriorates as water can penetrate through the flashing
Solution Approach 1:
The invention segments the protection system into two distinct functional components: the galvanized steel drip edge for rodent exclusion and the separate fastener assembly with integrated waterproof seal for water exclusion. This segmentation allows each component to optimize its specific function without compromising the other.
Solution Approach 2:
The invention introduces a waterproof seal as an intermediary element between the metal drip edge and the roof structure. This seal mediator prevents water penetration while allowing the metal flashing to maintain its rodent exclusion function, thus resolving the conflict between rodent protection and water exclusion.
3Ease of manufacture
If conventional drip edges are used, then installation cost is reduced, but pest exclusion reliability deteriorates as pests can access gaps between roof deck and fascia
Solution Approach 1:
The invention employs a composite system combining galvanized steel material with superior mechanical strength and rust resistance, paired with a dedicated fastening system. This composite approach provides reliable pest exclusion through the strength and durability of the materials while maintaining cost-effectiveness through efficient installation procedures.
Data Source
AI summary
A Drip Edge Configuration (aka Rodent Proof Drip Edge System) is designed for residential use to cover the construction gap above the fascia to prevent rodent entry and to direct water into the gutters. The Drip Edge Configuration also comes with a Roof Return Configuration to seal the gap where the soffit meets the shingles. Finally, The Drip Edge Configuration also has the option for venting in the rare occasion where a house has no soffit or additional venting is required. An improved drip edge which includes holes in the fascia-facing face which allows the drip edge to be screwed from the face using screws with rubber washers for a water proof seal just as used on a metal roof for a rodent proof solution. An improved drip edge which includes also galvanized steel and is flexible enough to cut and bend for proper installation to have rodent proof inside and outside corners. A roof return configuration to seal the construction gap where the soffit meets the shingles.