B Deck Metal Decking Dimensions, Rib Spacing, Gauge, and Span Tables
B Deck Metal Decking Dimensions, Rib Spacing and Specifications
B Deck is one of the most widely used structural metal decking profiles in commercial and industrial construction. It is commonly used as a structural floor deck, roof deck, and composite slab deck in steel building construction.
B Deck is designed to span between structural steel beams and provide a platform for concrete floor systems or roofing assemblies. The profile consists of trapezoidal ribs that provide structural strength while minimizing steel usage.
Typical applications include:
• commercial buildings
• office buildings
• warehouses
• parking structures
• industrial facilities
• multi-story steel buildings
• mezzanine floor systems
B Deck is produced using heavy-duty roll forming machines that shape galvanized steel coil into structural decking profiles.
This guide provides a detailed technical overview of B Deck dimensions, rib spacing, steel gauges, span tables, and production specifications used by structural engineers, steel fabricators, and construction contractors.
What is B Deck
B Deck, often referred to as Type B Steel Deck, is a structural metal decking profile used in steel building construction.
The profile typically features 1.5 inch deep trapezoidal ribs spaced evenly across the panel width.
Key characteristics include:
• trapezoidal rib design
• high structural strength
• compatibility with concrete slabs
• fast installation
• long span capability
B Deck can be used as either:
• roof decking
• composite floor decking
• non-composite structural decking
Standard B Deck Dimensions
B Deck profiles follow standardized dimensions used throughout the construction industry.
Typical dimensions include:
Specification
Typical Measurement
Deck Depth
1.5 inches (38 mm)
Coverage Width
36 inches (914 mm)
Rib Pitch
6 inches (152 mm)
Rib Height
1.5 inches (38 mm)
Panel Length
Custom roll formed
Coverage width refers to the installed width after panel side laps are connected.
Rib Profile Geometry
B Deck uses a trapezoidal rib design that provides structural strength and efficient load distribution.
Typical rib geometry includes:
Feature
Measurement
Rib height
1.5 inches
Rib spacing
6 inches
Rib top width
1.5 – 2 inches
Rib base width
3 – 4 inches
The trapezoidal ribs increase deck stiffness and reduce deflection under load.
Steel Gauge Range for B Deck
B Deck is typically manufactured using galvanized steel in a range of structural gauges.
Typical thickness ranges include:
Gauge
Thickness
Typical Application
22 gauge
0.76 mm
Light structural decking
20 gauge
0.91 mm
Standard commercial decking
18 gauge
1.21 mm
Heavy structural floors
16 gauge
1.52 mm
High load applications
Heavier gauges provide greater load capacity and span capability.
Standard Deck Length
B Deck panels are typically produced in custom lengths to match project requirements.
Typical lengths include:
Length
Application
6 – 12 ft
small span structures
12 – 20 ft
standard commercial buildings
20 – 30 ft
large industrial spans
Panels are cut to length during the roll forming process.
B Deck Span Tables (Typical)
The allowable span of B Deck depends on steel gauge and loading conditions.
Typical spans include:
Gauge
Roof Deck Span
Floor Deck Span
22 gauge
5 – 6 ft
4 – 5 ft
20 gauge
6 – 8 ft
5 – 6 ft
18 gauge
8 – 10 ft
6 – 8 ft
16 gauge
10 – 12 ft
8 – 10 ft
Actual span capacity depends on project design loads.
Materials Used for B Deck
B Deck is typically manufactured using corrosion-resistant steel.
Common materials include:
Galvanized steel
Galvalume steel
Prime painted steel
Galvanized steel is the most commonly used material for structural metal decking.
Composite B Deck Systems
B Deck can also be used in composite floor systems where concrete is poured on top of the deck.
In composite systems:
• shear studs connect deck to beams
• concrete bonds with deck ribs
• structural strength increases
Composite decking improves floor strength and reduces steel requirements.
Industries Using B Deck
B Deck is widely used in commercial and industrial steel construction.
Typical applications include:
Office buildings
Warehouses
Industrial plants
Parking structures
Retail buildings
Steel mezzanines
It is one of the most common steel deck profiles used in North America.
Roll Forming Machines Used to Produce B Deck
B Deck is produced using heavy-duty structural deck roll forming machines.
Typical machine specifications include:
Number of forming stations
20 – 28 stations
Roller material
Hardened tool steel
Machine speed
15 – 30 meters per minute
Drive system
Gearbox drive
Cutting system
Hydraulic flying shear
Control system
PLC automatic length control
These machines continuously form galvanized steel coil into structural deck panels.
Installation Characteristics
B Deck panels are typically installed perpendicular to structural steel beams.
Installation advantages include:
• rapid installation
• reduced construction time
• strong structural support
• compatibility with concrete floors
Panels are fastened to beams using welds or mechanical fasteners.
Common Manufacturing Problems
Manufacturing issues can occur if roll forming equipment is not properly calibrated.
Common problems include:
incorrect rib dimensions
panel camber
coil camber distortion
edge wave
Precision roll tooling and proper coil feeding prevent these issues.
Frequently Asked Questions
What is B Deck?
B Deck is a structural steel decking profile used for floors and roofs in steel buildings.
What depth is B Deck?
Standard B Deck depth is 1.5 inches (38 mm).
What width is B Deck?
Standard coverage width is 36 inches (914 mm).
What gauges are available for B Deck?
Common gauges include 22, 20, 18, and 16 gauge steel.
Where is B Deck used?
B Deck is widely used in commercial buildings, warehouses, steel structures, and concrete floor systems.
Conclusion
B Deck is one of the most widely used structural metal decking systems in modern steel construction. Its trapezoidal rib design provides excellent strength, efficient load distribution, and compatibility with composite concrete floor systems.
Understanding B Deck dimensions, rib spacing, steel gauges, span tables, and manufacturing specifications is essential for engineers, steel fabricators, and construction professionals.
Roll forming machines used to produce B Deck allow manufacturers to efficiently produce high-strength structural decking panels used worldwide in commercial and industrial steel buildings.