Why the G575 Design Number Changes Everything
Most fire-rated subfloor specifications are written generically — '2-hour fire-rated assembly per UL standards.' That language leaves the substitution door open through the entire project lifecycle. Any compliant product can be swapped in at submittal, at value engineering, or at the GC's discretion.
UL Design G575 closes that door. It's an exclusive design number held only by DragonBoard. When you reference G575 by design number in CSI Section 06.16.23, no other product qualifies. The substitution conversation doesn't happen.
What the Certification Covers
UL Design G575 is a 2-hour fire-rated floor/ceiling assembly certified per ASTM E119. The assembly uses a 3/4" DragonBoard MgO panel over cold-formed steel framing. No supplementary Type X gypsum is required to achieve the 2-hour rating — the panel itself carries the certification.
Additional certifications that come with the DragonBoard specification:
- UL U055 — 2-hour fire-rated assembly (non-exclusive, shared with other products)
- ASTM E84 — Surface burning characteristics
- ASTM E136 — Non-combustibility (passes)
- IBC 2006 through 2024 compliance
Sound Performance Without a Sound Mat
DragonBoard achieves STC 59 in qualifying assemblies without a supplementary sound mat. For mid-rise multifamily, hotel, and mixed-use projects where acoustics are a design driver, this eliminates one additional product from the assembly and one additional specification to coordinate.
The STC 59 rating is documented in the UL listing and available in the submittal package.
How to Write the Spec
The CSI specification section is 06.16.23. The complete spec language — including the UL Design G575 reference, ASTM E119 compliance, and substitution language — is available from DragonBoard's technical team as a ready-to-paste specification block.
For firms working on Type IIIA/IIIB or Type V construction, the assembly documentation covers both construction classifications at 5-over-1 and standard mid-rise configurations.
Sustainability Documentation
DragonBoard contributes to LEED IEQ Section 4 credits. The panel contains no asbestos, no formaldehyde, and no VOCs. For ESG-mandated portfolios or LEED-targeted projects, the documentation is part of the standard submittal package.