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Steel Roof Decking provides structural support for commercial and industrial roofing systems and is available in multiple profiles, including Type A (Narrow Rib), Type B (Wide Rib), Type F (Intermediate Rib), and Type N (Deep Rib). Each profile offers different span and load capabilities, from light-duty and form-deck use to long-span, heavy-duty roof applications. Decking is offered in galvanized (G60/G90), prime-painted, or bare steel finishes, providing options for corrosion resistance, interior use, or cost-sensitive applications. Compatible with most roofing assemblies, steel roof deck installs quickly, delivers uniform support, and works with a wide range of framing system
Type N (Deep Rib) Roof Metal Decking
Unit of Measure
1 

Item Name

Depth (in)

Top Rib Opening (in)

Bottom Rib Opening (in)

Pitch (in)

Thickness (gauge)

Thickness (in)

Weight Per Square Foot (lb)

Type

Finish

Drawing

3 X 20 GA TYPE N (DR) METAL ROOF DECKING N/A 3 N/A 4 3/8 N/A 2 1/16 N/A 8 N/A 20 N/A 0.0358 N/A 2.70 N/A Type N (DR - Deep Rib) N/A Bare Galvanized Painted

3 X 18 GA TYPE N (DR) METAL ROOF DECKING N/A 3 N/A 4 3/8 N/A 3 1/16 N/A 8 N/A 18 N/A 0.0474 N/A 3.50 N/A Type N (DR - Deep Rib) N/A Bare Galvanized Painted

Unit of Measure
1