Why Is Type B Deck So Common on Florida Commercial Roofs?
The Florida Building Code does not favor any single deck type; it requires the roof to resist design loads, including hurricane wind uplift. Type B is common because its 1.5" wide rib profile supports rigid insulation well, covers 36" per sheet, comes in 22 to 16 gauge for high-wind zones and has published ANSI/SDI load data. We supply Type B cut to length across Florida.
What makes Type B a practical choice
- Wide ribs give a broad top surface for insulation boards and membrane attachment.
- 36" coverage means fewer sheets and sidelaps, so installation goes faster.
- Four gauges let engineers increase capacity at edges and corners without changing profile.
- Fastener layouts from 36/3 to 36/7 let the design tune uplift and diaphragm capacity.
- Vented and painted options cover insulating concrete roofs and exposed ceilings.
What the code actually checks
Code compliance comes from the design: loads, deck capacity from AISI and SDI standards, fastening, and a roof assembly that meets the roofing provisions, including HVHZ requirements in Miami-Dade and Broward. A different profile, such as 3" Type N for long spans, is just as compliant when it is designed for the loads.
Send your drawings and we will quote the Type B gauges and lengths your engineer specified.
Related Questions
Is Type B deck hurricane rated?
Deck is not rated by itself. Wind resistance comes from the engineered combination of gauge, span, fastening and the roof assembly above it. The engineer designs for the project's wind loads, and HVHZ projects may need specific approvals for the assembly. Ask us for the documentation your permit requires.
When is Type N used instead of Type B?
When supports are spaced farther apart than Type B can span economically. 3" Type N deck has 24" coverage and greater depth for long spans. The engineer chooses based on framing layout and loads. We supply both, in 22 to 16 gauge and G60 or G90 coating.