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Terms
Type A Metal Roof Deck is a 1 1/2" deep, narrow rib metal roofing deck that provides an economical metal roofing system.
Unit of Measure

Design Thickness

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

Height (Min.)

N/A 1 1/2 in

Rib Spacing – Bottom (Min.)

N/A 3/8 in

Rib Spacing – Top (Max.)

N/A 1 in

Pitch (Rib Spacing – Center to Center)

N/A 6 in

Cover Widths

N/A 36 in

Industry References

N/A Type A, Narrow Rib, NR

Finishes

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

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.)
4'-0" 4'-6" 5'-0" 5'-6" 6'-0" 6'-6" 7'-0" 7'-6"        
R 22
0.0295 73 58 47                    
R 20 0.0358 91 72 58 48 40                
R 18 0.0474 125 99 80 66 55 47              
R 22
0.0295 80 63 51 42                  
R 20 0.0358 97 76 62 51 43                
R 18 0.0474 128 101 82 68 57 48 42            
R 22
0.0295 100 79 64 53 44                
R 20 0.0358 121 96 77 64 54 46              
R 18 0.0474 160 126 102 85 71 61 52 45