How Does Type B Deck Work With Fireproofing and Acoustic Systems?
Type B deck is commonly used in UL-listed fire-rated roof assemblies, but the rating belongs to the whole assembly (deck, insulation, fireproofing, framing and roofing), not the deck alone. Confirm the specific design number and that every component, including deck gauge and finish, matches it. For acoustics, the deck works with ceilings and insulation. Send the assembly and we will quote matching deck.
Fireproofing
- Each listed assembly defines the deck type, minimum gauge and fireproofing thickness; follow it exactly.
- Spray-applied fireproofing adhesion can depend on the deck surface, so check whether the fireproofing manufacturer and listing accept galvanized or painted deck.
- Fireproofing may be applied to the deck underside, the framing or both, depending on the design.
- We do not claim fire ratings for our products; the design team selects the listed assembly.
Acoustics
Plain Type B deck is a hard, reflective surface. Sound control usually comes from insulation above the deck, acoustic ceilings below, or acoustic deck profiles with perforated webs and sound-absorbing fill. Our catalog does not list an acoustic version of Type B, so ask us if your project calls for one.
Before you order
Send the fire-rated design numbers and the finish requirements with your plans, and we will quote the gauge and coating that match.
Related Questions
Does painted deck affect fireproofing?
It can. Some spray fireproofing products and listings limit which deck surfaces are acceptable or require bond tests. Check the fireproofing manufacturer's requirements and the listed design before choosing painted or galvanized deck. Tell us which you need when you request a quote.
Who confirms the fire-rated assembly?
The architect or engineer of record selects the listed design and specifies matching components. The building official reviews it at permit. We supply the deck gauge and finish the specification calls for. Send us the design number with your plans so the quote matches it.