Water Draining Spandrel Assembly for Insulated Panel Window Walls
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Solution Overview
Problem
Conventional exterior building envelope enclosures face challenges with water drainage, thermal exchange, and air seal maintenance, leading to issues like condensation, mold growth, and increased material costs due to complex designs and hidden air seal complications.
Innovation Solution
A water draining spandrel assembly with a modest vertical height and pre-installed fasteners, featuring an architectural fascia with adhesive tape or silicone protection, and a structural-insulated panel system that reduces thermal transfer and eliminates the need for external reinforcement, allowing for easier installation and maintenance of primary air seals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a waterproof membrane is added to seal concrete slabs, then water protection is improved, but device complexity and material costs increase
Solution Approach 1:
The patent removes the waterproof membrane from the assembly by providing pre-formed receiver extrusions with integrated sealing capabilities. The head receptor and sub-sill receiver are designed with built-in sealing surfaces and gaskets that eliminate the need for separate waterproof membranes, thereby reducing material complexity while maintaining water protection.
Solution Approach 2:
The patent combines the sealing function into the structural receiver extrusions themselves. The head receptor and sub-sill receiver integrate both structural support and water sealing functions, merging what were previously separate components (structural element + waterproof membrane) into a single unified component.
2Reliability
If sub sill vertical height is increased to manage water drainage, then water drainage is improved, but thermal exchange increases leading to condensation risk
Solution Approach 1:
The patent introduces an air gap as an intermediary thermal break between the sub-sill receiver and the insulated panel. This air gap acts as a thermal mediator that prevents direct thermal conduction, reducing the temperature differential that causes condensation while still allowing the sub-sill to maintain sufficient height for water drainage.
Solution Approach 2:
The patent segments the thermal path by creating discrete thermal breaks at critical locations. The air gap separates the interior environment from the exterior sub-sill structure, interrupting the thermal bridge that would otherwise conduct heat/cold to the sub-sill surface and cause condensation.
3Reliability
If site-installed waterproof membrane is used, then water protection is improved, but installation time and sequence criticality increase
Solution Approach 1:
The patent applies preliminary action by pre-installing all sealing components (gaskets, sealing surfaces, and waterproofing features) during factory assembly of the receiver extrusions. This eliminates the need for time-critical site installation of waterproof membranes, allowing modules to be installed in any sequence without compromising water protection.
Solution Approach 2:
The patent enables self-service by designing the receiver extrusions with self-sealing capabilities through integrated gaskets and geometric sealing surfaces. The system seals itself through the interlocking geometry of male/female joints and pre-installed gaskets, eliminating the need for additional site-installed waterproofing materials and reducing installation complexity.
4Ease of manufacture
If exterior surface applied seals are used, then assembly simplicity is improved, but seal compromise over time occurs allowing water entry
Solution Approach 1:
The patent uses flexible gaskets (such as rubber or elastomeric materials) as the primary sealing mechanism in the receiver extrusions. These flexible seals conform to the mating surfaces and maintain sealing pressure over time, resisting UV degradation and temperature cycling better than rigid exterior caulkings, thereby improving long-term seal durability.
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 enhances water drainage, reduces condensation risks, improves thermal performance, and simplifies the installation process while maintaining indoor air quality and reducing material complexity and costs.
Implementation Method 1
an architectural fascia with adhesive tape or silicone protection
Implementation Method 2
a structural-insulated panel system that reduces thermal transfer
Data Source
AI summary
A window wall assembly including an insulated panel having at least one hole; at least one spacer located between and abutting a first portion of an outside of the insulated panel and an inside of an architectural fascia panel; at least one layer of nonconducting material connected to the at least one spacer and sandwiched between a second portion of the outside of the insulated panel and the inside of the architectural fascia panel; and a first fastener having a hollow inner section inserted into the at least one hole which has threading on the inside, an outer section having threading on the outside and extending into the layer of nonconducting material; and a flange located between the inner section and outer section of the first fastener and having a greater lateral dimension than the radius of the at least one hole.