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Type A Roof Deck with Stiffening Rib

A Roof Deck with Stiffening Rib (Narrow Rib)

Specifications and Span Chart below

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Type A Roof Deck with Stiffening Rib Data Sheet

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"

Type A Roof Decking with Stiffening Rib

D-MAC Industries offers Type A Roof Decking with Stiffening Rib for reroofing projects to either:

Match your existing Type A roof deck that also has a stiffening rib, or
Replace existing Type A or Type F roof decks without stiffening ribs in order to achieve much higher allowable construction spans and load capacity for two or more spans.

The only caveat is that the Type A narrow rib roof deck with a stiffening rib is not Factory Mutual (FM) Approved. If an FM approved product is required for your project that utilizes Type A decking, you will need to use the profile without a stiffening rib.

Why Choose D-MAC Industries?

At D-MAC Industries, our team of experts understands the importance of timely and reliable service. That’s why we offer same-day steel deck delivery, so our clients can keep the project on schedule. Our expert team can answer any questions and help find the best roofing solution for any project’s needs.

For more information about our Type A Roof Decking and to discuss your next project, contact us today!

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