TL;DR — The Bottom Line
- The Change: The industry is moving away from traditional 1" gypsum liner panels in favor of densely spray-applied, all-in-one firewall solutions like the Greenfiber Sanctuary system.
- The Impact: This U370 Assembly allows trades to work simultaneously, speeds up the construction process, and increases leasable or livable square footage by optimizing the double wall assembly footprint.
- The Ducere Action Plan: For our upcoming mixed-use and multi-family structural scopes, we are evaluating spray-applied assemblies to achieve required sound ratings while condensing complex MEP rough-in schedules.
The Industry Update: What's Happening
Based on the technical specifications highlighted in the recent industry advertisement (reference file: "20261002_055058.jpg"), the SANCTUARY Two-Hour Firewall by Greenfiber offers a compelling alternative to conventional multi-family framing.
- Fire & Sound Performance: The system achieves a 2-hour fire rating and boasts a high STC 60 rating, making it one of the most effective sound-blocking firewalls available.
- Air Quality & Efficiency: It provides a lower ACH (Air Changes per Hour) and reduced air infiltration, complying with ENERGY STAR and the 2021 IRC 3 ACH50 requirements. This also actively reduces odor transmission between adjoining units.
- Framing Advantages: The system allows for conventional framing and yields an additional 2 to 2.5 inches of construction space when utilizing an 8" double wall assembly.
- Historical Track Record: Originally rated by Underwriters Laboratory in 2002, the U370 Assembly minimizes trade damage and reduces unintended airflow.
The Ducere Perspective: What This Means for Your Project
At Ducere Construction Services, our corporate office is full of administrative people, not programmers, meaning our project management efficiency relies heavily on highly streamlined field operations and smart, standardized material selection. By utilizing an all-in-one solution that allows for conventional framing and simultaneous trade work, our administrative team can schedule mechanical, electrical, and plumbing contractors with fewer sequential bottlenecks.
The reduction in weather-related damage during the build and the minimization of odor transmission between finished units are critical quality-control factors for our high-density coastal and metro-Atlanta developments. Gaining up to 2.5 inches of space per demising wall can substantially improve floor plan flexibility for our developer clients.
Cost & Timeline Impact Matrix
- Space Utilization — Traditional 1" gypsum liner: Standard footprint. Greenfiber Sanctuary: Gains 2" to 2.5" on 8" double wall. Ducere's mitigation: Optimizing floor plans to maximize developer ROI.
- Trade Scheduling — Traditional: Sequential workflows. Greenfiber Sanctuary: Trades work simultaneously. Ducere's mitigation: Overlapping MEP rough-ins to compress timelines.
- Acoustics & Air — Traditional: Standard STC. Greenfiber Sanctuary: High STC 60 rating & lower ACH. Ducere's mitigation: Upgrading tenant comfort specs and marketing value.
Frequently Asked Questions
1. How does the Greenfiber Sanctuary system improve tenant comfort in townhomes?
It acts as a highly effective sound-blocking firewall with a best-in-class STC 60 rating, while also reducing unintended air infiltration and odor transmission between units.
2. Does this firewall require specialized framing?
No, the system allows for conventional framing, which creates construction efficiency, speeds up the process, and minimizes weather-related damage during the build.
Ducere Construction Services, Inc.
GA GC GCCO006711 | GA RLQ RLQQA005251 | NASCLA 404696491 | IICRC 7781459