Vented Eave Riser With Ember-Blocking Roof Ventilation
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Solution Overview
Problem
Traditional ventilation systems in buildings are vulnerable to wildfires, as embers can enter through vents and ignite combustible materials, posing a risk of fire damage, and there is a need for enhanced ventilation solutions that balance ember protection with airflow requirements.
Innovation Solution
The implementation of a roof structure with a vented eave riser system that includes a barrier wall and an ember impedance structure, such as mesh material or baffle members, to prevent ember ingress while allowing airflow, and the use of vent members that mimic roof cover elements to create an air layer between the roof deck and cover elements, ensuring adequate ventilation and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional vents are used for above sheathing ventilation, then air flow is permitted, but embers can ingress through the vents and ignite combustible materials
Solution Approach 1:
The patent introduces an intermediary ember impedance structure (such as mesh screens, baffle members, or impedance material) positioned within the vent opening or adjacent thereto. This intermediary component allows air to pass through while physically blocking or impeding the passage of floating embers, thus resolving the contradiction between maintaining ventilation airflow and preventing ember ingress that could cause fire.
Solution Approach 2:
The patent employs porous or permeable materials (such as mesh screens with specific opening sizes, baffle members with gaps, or impedance material with controlled porosity) in the vent structure. These materials allow air molecules to pass through while their pore structure is sufficiently small to block larger ember particles, thereby achieving both airflow requirements and fire safety by filtering out harmful embers.
2Reliability
If ember impedance structures are added to vents, then ember protection is improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into the vent structure by combining the ventilation opening with an ember impedance structure in a single assembly. The vent structure simultaneously performs air intake/exhaust and ember filtration functions, eliminating the need for separate protective components and reducing overall system complexity despite adding fire protection capability.
Solution Approach 2:
The patent employs disposable or replaceable ember impedance components (such as mesh screens or baffle members) that can be easily installed, maintained, and replaced. These components are designed to be discarded or recovered independently from the main vent structure, simplifying maintenance operations and reducing the complexity of the overall system by allowing modular replacement rather than complete vent assembly replacement.
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
This solution effectively prevents the ingress of floating embers while maintaining sufficient airflow, enhancing building safety and energy efficiency by reducing the risk of fire damage and promoting cooling through improved ventilation.
Implementation Method 1
At least one of the vent members comprises an ember impedance structure that substantially prevents ingress of floating embers through the opening of the vent member while permitting air flow through the opening
Implementation Method 2
Increasing ASV has the beneficial effect of cooling the batten cavity and reducing the amount of radiant heat that can transfer into the structure of the building
Implementation Method 3
ventilation of an attic space can prevent the attic's temperature from rising to undesirable levels
Data Source
AI summary
A roof structure and a vented eave riser are described. A vented eave riser can include a barrier wall with one or more air flow openings, and an ember impedance structure positioned proximate to the barrier wall. A roof structure may comprise a roof deck and a layer of roof cover elements spaced above the roof deck to form an air layer between the roof deck and the roof cover elements. The roof structure may also comprise one or more vent members each replacing and mimicking an appearance of one or more roof cover elements of the layer of roof cover elements, and/or at least one vented eave riser positioned at an eave between the roof deck and the layer of roof cover elements. The vent members and/or the vented eave riser may further include an ember impedance structure, such as a fire-resistant mesh material or a baffle structure.