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Type A Roof Deck with Stiffening Rib

A Roof Deck with Stiffening Rib (Narrow Rib)

Specifications and Span Chart below

TypeADeckST

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

22
20

Type A roof deck with stiffening rib is most readily available with material thicknesses defined by the even gauges 20 and 22 These correspond to design thicknesses of 0.0359” and 0.0299″ respectively.

Maximum Construction Span
No. of Spans Deck Type Max Const. Span
 1 A22
A20
 6'-4"
7'-7"
 2 or more  A22
A20
 7'-10"
9'-4"
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