Concealed Panel Clip for Standing Seam Roof Systems
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Solution Overview
Problem
Traditional standing seam roof systems face challenges in accommodating temperature fluctuations due to rigid hold down clips that restrict panel movement, leading to potential damage from uplift forces and weather exposure.
Innovation Solution
A two-piece standing seam roof clip system with a clip base and tab configuration, featuring interlocking elements and apertures for secure attachment to substructures, allowing for horizontal movement while resisting uplift forces and maintaining weather tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid hold down clips are used to resist uplift forces, then resistance to wind and environmental loading is improved, but flexibility for panel thermal expansion and contraction is reduced
Solution Approach 1:
The hold down clip is divided into multiple functional segments: a rigid base portion for attachment to the substructure, a flexible intermediate portion with interlocking elements that can deform, and a tab portion for engaging the roof panel. This segmentation allows different parts of the clip to have different degrees of rigidity, enabling it to resist uplift forces while accommodating thermal movement of the panels.
Solution Approach 2:
The clip incorporates dynamic elements that allow it to adapt its behavior based on applied forces. The interlocking elements with seats and shoulders are designed to engage under normal conditions to resist uplift, but can deform or disengage to accommodate thermal expansion and contraction. This dynamic behavior allows the clip to transition between rigid and flexible states as needed.
2Reliability
If rigid hold down clips are used to provide structural resistance, then reliability under environmental loading is improved, but potential damage from restricted panel movement increases
Solution Approach 1:
The clip design incorporates built-in flexibility and movement accommodation capabilities before damage can occur. The flexible intermediate portion and the interlocking elements with seats and shoulders are designed to allow controlled deformation and panel movement, cushioning the system against the harmful effects of restricted thermal expansion and contraction before stress builds up to damaging levels.
3Adaptability or versatility
If flexible clip design is used to accommodate panel movement, then adaptability to thermal fluctuations is improved, but resistance to uplift forces is reduced
Solution Approach 1:
Different portions of the clip are assigned different mechanical properties to perform different functions. The base portion is made rigid for strong attachment to the substructure, the intermediate portion is made flexible to accommodate thermal movement, and the tab portion is designed to engage the panel. This local differentiation of material properties and structural characteristics allows the clip to simultaneously provide both flexibility for thermal expansion and strength for uplift resistance.
Data Source
AI summary
A standing seam roof clip system has a clip base with a horizontal portion and a vertical portion extending upwardly therefrom, and a clip tab comprising a return bend having a “U” configuration extending from a lower end of a vertical back surface, and a top portion comprising a hook for engaging with a roof panel. An interlocking element is formed in the vertical portion of the clip base, and has at least one seat with a substantially a “J” configuration which extends upwardly and outwardly from the vertical portion of the clip base and a respective shoulder extending from a top edge of the vertical portion of the clip base in a reverse “U” configuration. A roof panel is joined to the roof clip via the clip tab to form a seam; and the clip tab return bend engages with the clip base shoulder and seat.