Interlocking Curtain Wall Insulation Panels for Fire-Resistant Seams
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Solution Overview
Problem
Conventional curtain wall insulation systems are limited by the maximum manufacturable length of insulation panels, leading to the formation of vertical seams when spanning mullion distances greater than 72 inches, which can compromise fire resistance by allowing flames to pass between adjacent floors.
Innovation Solution
The system employs curtain wall insulation panels with longitudinally extending indentations and protrusions, allowing them to interlock in a tongue-and-groove fashion without the need for additional reinforcing members, thereby maintaining fire resistance across extended mullion distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the mullion distance is increased beyond 72 inches to widen the unobstructed view, then the daylight opening width is improved, but vertical seams must be introduced which compromise fire resistance
Solution Approach 1:
The insulation panel is segmented into two separate panels that abut against each other to span the mullion distance. Each panel maintains its structural integrity and fire resistance properties while collectively covering the extended opening width that would exceed the 72-inch maximum length of a single panel.
Solution Approach 2:
A reinforcing member is introduced as an intermediary element at the vertical seam between the two insulation panels. This reinforcing member mediates the connection between panels, providing structural support and maintaining the fire resistance barrier at the seam location where the two panels meet.
2Length of moving object
If multiple insulation panels are used to span mullion distances greater than 72 inches, then the daylight opening width is increased, but a vertical seam is formed that may become compromised during fire
Solution Approach 1:
The reinforcing member is pre-installed at the vertical seam location before the insulation panels are positioned. This preliminary action ensures that the fire resistance barrier is established in advance at the vulnerable seam location, preventing flame pathways before any fire exposure occurs.
Solution Approach 2:
The system combines multiple materials including the insulation panels and the reinforcing member to create a composite fire resistance system. The reinforcing member enhances the fire resistance properties at the seam, creating a composite structure that maintains integrity under fire conditions better than the panels alone.
3Ease of manufacture
If conventional insulation panels with maximum length of 72 inches are used, then manufacturing and shipping constraints are satisfied, but the mullion distance is limited and requires additional panels with seams
Solution Approach 1:
The system segments the insulation coverage into multiple standard-sized panels that can be manufactured and shipped using conventional methods. This segmentation allows each panel to remain within the 72-inch maximum length constraint while the assembled system achieves the required coverage for larger mullion distances.
Solution Approach 2:
The reinforcing member serves multiple functions: it reinforces the vertical seam to maintain fire resistance, provides structural support for the abutting panels, and enables the system to accommodate varying mullion distances. This multi-functionality reduces the need for additional specialized components.
Data Source
AI summary
A system for insulating a curtain wall structure is provided. The system includes framing defined by vertically disposed and parallel mullions separated by a mullion distance; a first curtain wall insulation panel disposed within the framing and having a longitudinally extending indentation; and a second curtain wall insulation panel disposed within the framing and having a longitudinally extending protrusion. The curtain wall insulation panels are disposed within the framing such that the protrusion of the second panel is at least partially disposed within the indentation of the first panel. The panels can be comprised of mineral wool. The system has a flame rating of at least 2 hours, as measured in accordance with ASTM E2307. Also provided are an insulated curtain wall component that includes similar first and second curtain wall insulation panels and a curtain wall insulation panel suitable for use in the systems and components described herein.