Type A Roof Deck with Stiffening Rib
A DECK WITH STIFFENING RIB(NARROW RIB)
STEEL ROOF DECKING DIMENSIONS & INFO
PRODUCT INFO
Industry Designations
Type A
Narrow Rib
NR
Type A roof deck is the “original” term for this deck profile, though recently the Steel Deck Institute has promoted the more descriptive name, “Narrow Rib Roof Deck”, or “Type NR”.
Finishes
G90
G60
Gauges
20
18
Type A roof deck with stiffening rib is most readily available with material thicknesses defined by the even gauges 18 and 20 These correspond to design thicknesses of 0.0474” and 0.0358” respectively.
No. of Spans | Deck Type | Max Const. Span |
1 | A22
A20 A18 |
3'-9"
4'-8" 6'-0" |
2 or more | A22
A20 A18 |
4'-7"
5'-3" 6'-0" |


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