Rollable Ventilation Strip with Porous Membrane for Roof Sealing
Solution Overview
Problem
Existing ventilation strips for roofs fail to balance air exchange with effective prevention of water, snow, and vermin ingress, often being either too impermeable to air or insufficient in sealing.
Innovation Solution
A ventilation strip design featuring parallel side strips and a central strip with interconnected walls forming ventilation ducts, which can be rolled and automatically open when unrolled, incorporating breathable or dense materials with perforations to create multiple ventilation levels that prevent driving rain and snow ingress while allowing air exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ventilation strips are made impermeable to water, snow and vermin, then sealing performance is improved, but air exchange capability deteriorates
Solution Approach 1:
The ventilation strip employs a porous membrane material that allows air molecules to pass through while blocking larger particles such as water droplets, snowflakes, and vermin. The porous structure provides selective permeability based on particle size, enabling simultaneous achievement of sealing and ventilation functions.
Solution Approach 2:
The ventilation strip combines multiple materials with complementary properties: a porous membrane for selective filtration, hydrophobic coatings for water resistance, and structurally reinforced sections for mechanical strength. This composite approach allows the single product to deliver both sealing and ventilation performance.
2Productivity
If ventilation strips are made permeable to air, then air exchange capability is improved, but water, snow and vermin ingress increases
Solution Approach 1:
The carefully controlled porous structure allows air molecules to pass through while the pore dimensions are sufficiently small to block water droplets, snowflakes, and vermin. The porosity is optimized to maintain high air permeability while providing effective filtration against harmful factors.
Solution Approach 2:
The porous membrane acts as an intermediary barrier between the interior and exterior environments, selectively mediating what can pass through. It allows beneficial air exchange while blocking harmful water, snow, and vermin, functioning as an intelligent filter.
3Ease of operation
If ventilation strips are designed as rolls for easy installation, then ease of operation is improved, but structural complexity increases
Solution Approach 1:
The ventilation strip is manufactured as a continuous roll that can be easily unrolled and installed along the roof ridge. This segmented, modular format simplifies handling and installation while the internal composite structure provides the necessary functionality.
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 provides a rollable ventilation strip with enhanced air exchange properties under the roof skin, secured against driving rain and snow, with adjustable ventilation levels and drainage channels to prevent water accumulation, effectively addressing the impermeability and sealing issues of existing designs.
Implementation Method 1
The ingress of driving rain or blowing snow is prevented by one or more channels made of breathable or dense materials with perforations
Implementation Method 2
Drainage channels on all levels, except the innermost one, ensure that water in any intermediate levels can drain off to the outside
Data Source
Figure 1
Figure 2~3
Figure 4a~4b
AI summary
The invention relates to a ventilation strip with at least two side strips running parallel to each other and a center strip. The ventilation strips run parallel to the side strips and are formed by circular walls or webs connected to each other. The ventilation strips can also have the most varied shapes. At least one duct is provided; however, it is also possible to provide a plurality of ducts. By the use of certain materials for the ventilation strip which have restorative forces, the at least one duct can open by itself when the ventilation strip is rolled out. However, it is also possible to effect an opening of the at least one duct by pulling on the side strips.