Type N32 Roof Deck
N32 DECK (DEEP RIB)
STEEL ROOF DECKING DIMENSIONS & INFO
PRODUCT INFO
Industry Designations
Type N32
NW32
Finishes
Prime Painted
Galvanized
Gauges
22
20
18
16
Type N32 roof deck is most readily available with material thicknesses defined by the even gauges 16, 18, 20, and 22. These correspond to design thicknesses of 0.0598”, 0.0474”, 0.0358”, and 0.0295”, respectively. While metal N32 decks can be produced in any material thickness between 16 and 22, defining an “odd” or “special” gauge will make the deck much more difficult to source.
| No. of Spans | Deck Type | Max Const. Span |
| 1 | N32 22
N32 20 N32 18 N32 16 |
11'-11"
15'-4" 21'-1" 27'-5" |
| 2 or more | N32 22
N32 20 N32 18 N32 16 |
14'-7"
18'-11" 26'-0" 33'-9" |
What is Type N32 Roof Deck?
Type N32 Deep Rib Roof Deck is also known as “Type N32” or “NW32”. This metal decking is twice the depth of 1.5” Type B. The additional depth provides Type N32 the strength to span roughly twice the distance of Type B in the same gauge. The ability to span 10 feet or more makes the Type N32 roof deck ideal for applications with larger distances between supports. This decking type is common in canopies and structures with large open spaces. Structural members required to span large open spaces, like those found in auditoriums and gymnasiums, are deep, heavy, and expensive. These large members with Type DR roof decking allow the designer to use fewer primary supports by spacing them further apart.
Sound control is often challenging in large open spaces, so acoustical Type N32 decking should be used to control decibel levels. Acoustical Type N32 decking is designated as Type NA32, which is a standard Type N32 deck produced with perforations in the webs. When combined with fiberglass insulating batts that are field installed in the ribs, it absorbs up to 70% of the sound that reaches it.
Although the Type N32 deck is less widely used than the Type B deck, it is the deep deck product of choice for applications like canopies, gymnasiums, auditoriums, and other large open spaces. Contact our industry professionals at D-MAC Industries for more information about our Type N32 roof deck. We offer same-day fulfillment and shipping.
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