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Terms
Type N Metal Roof Deck is a 3" tall, deep rib metal roof deck, that is designed to provide an economical roofing support surface when longer spans are required between roofing supports.
Unit of Measure

Design Thickness

N/A 18 gauge (0.0474") 20 gauge (0.0358") 22 gauge (0.0295")

Height (Min.)

N/A 3 in

Rib Spacing – Bottom (Min.)

N/A 1 1/2 in

Rib Spacing – Top (Max.)

N/A 2 3/4 in

Pitch (Rib Spacing – Center to Center)

N/A 8 in

Cover Widths

N/A 24 in

Industry References

N/A Type N, Deep Rib, 3DR

Finishes

N/A Galvanized G60 Galvanized G90 Painted Gray Top/White Bottom Painted Gray Top/Gray Bottom

Special Applications

N/A Acoustical Cellular Cellular & Acoustical

N/A

Deck
Type
Span
Condition
Design
Thickness
Inches
Uniform Total (Dead & Live) Load in Pounds per Square Foot
Span Length - c. to c. Joists or Purlins (Ft. - In.)
9'-0" 9'-6" 10'-0" 10'-6" 11'-0" 11'-6" 12'-0" 12'-6" 13'-0" 13'-6" 14'-0" 14'-6"
3DR 22
0.0295 52 47 42                    
3DR 20 0.0358 65 58 53 48 43 40              
3DR 18 0.0474 89 80 72 66 60 55 49 45 41        
3DR 22
0.0295 59 53 48 44 40                
3DR 20 0.0358 72 65 59 53 48 44 41            
3DR 18 0.0474 96 86 78 70 64 59 54 50 46 43 40    
3DR 22
0.0295 74 66 60 54 50 45 42            
3DR 20 0.0358 90 81 73 66 60 55 51 47 43 40      
3DR 18 0.0474 120 107 97 88 80 73 67 62 57 53 50 46