Type A Steel Roof Deck

What is Type A roof deck?

Type A roof deck is often used for repair and re-roofing projects, due to its lower strength-to-weight ratio compared to Type B and Type F roof decks. The steel supports below the metal deck must be spaced closer together since Type A roof deck cannot carry as much load at longer spans.

Type A roof deck dimensions and specs

Industry designations

Type A Deck
Narrow Rib
NR

Gauge

Finishes

Primed Gray (protects the base steel in a properly enclosed, dry environment)
G60 Galvanized (protects the base steel in more aggressive interior environments or areas where greater corrosion resistance is required)

Maximum construction span

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″

Talk to a steel deck expert

Bryan Smith
816.810.0505
bryan.smith@nettlescs.com

Type A Steel Roof Deck and Metal Deck