3″ Type N Roof Deck
Type N Roof Deck is 3″ deep. Also known as deep rib, this structural metal roof deck provides a support surface for various types of roofing materials while its deep rib profile allows this roof deck to span further distances between roofing supports.
Description
Roof deck products act alone in transferring horizontal and vertical loads into the building frame. Roof Deck does not work compositely with other building materials.
About O’Donnell Metal Deck:
Since 1996 O’Donnell Metal Deck has been fueled by a high performing team you can count on. The order process is seamless from the time you request a metal deck quote, place an order and metal decking is delivered.
Our multiple stock & manufacturing locations combined with years of experience allow O’Donnell Metal Deck to service any job throughout the USA. Our process allows reduces the end-to-end logistic costs for delivering what you need when you need it. Contact your local branch to get started.
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FAQs:
What is 3″ Type N Roof Deck?
3″ Type N Roof Deck, often referred to as Type N, 3.0N, NS or Deep Rib Roof Deck, is a 3″-deep, narrow-rib profile designed to support roofing membranes in commercial construction.
What gauges are available for 3″ Type N Roof Deck?
We stock 16ga, 18ga, 20ga, and 22ga for Roof Deck applications. Gauge choice depends on your span and load requirements—review your specs or consult our team for guidance.
What finishes are offered for 3″ Type N Roof Deck?
Standard finishes include G-60 galvanized, G-90 galvanized, and primer-painted. Note that primer paint may reduce long-term corrosion resistance under roofing systems. Learn more about metal deck finishes here.
What factors influence the cost of 3″ Type N Roof Deck?
Cost factors include current steel prices, order quantity, gauge, finish, delivery location, and waste allowance. Contact your nearest branch for a tailored quote.
What lead times should I expect for 3″ Type N Roof Deck?
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- Stock lengths: same-day or next-day pickup/delivery.
- Custom-cut lengths (standard gauges & finishes): 1–2 weeks.
- Specialty orders (nonstandard gauges, coatings, acoustical): up to 12 weeks or longer. Plan ahead.
Can you custom-cut 3″ Type N Roof Deck to the length I need?
Yes. We custom-cut Roof Deck products like 3″ Type N to your specified lengths to reduce waste and speed installation.
How can I save money when buying 3″ Type N Roof Deck?
To cut costs, provide extra lead time, choose standard gauges and finishes, stay flexible on specs, and ask about surplus or secondary materials for discounts.
Do you carry surplus or “secondary” 3″ Type N Roof Deck at reduced prices?
Yes, we often have surplus or secondary material with minor imperfections at discounted rates. Contact us to check current availability.
N Deck Gauges:
N Deck Finishes:
Galvanized G-60 zinc coated steel is the standard in the deck industry.
Galvanized G-90 is typically specified for exterior applications or project specific needs.
PTD or primer painted is an impermanent, provisional coating and is gray on top and bottom.
Deck Options:
Hanger Tabs:
Hanger tabs are designed for the support of ceilings and you should consult your engineer for individual allowable loads on single hanger tabs.
3" N Acoustical Roof Deck:
3" Roof Deck is available as 3" acoustical roof decking. Acoustical N Deck provides sound reduction where the under side of the deck is exposed to the interior. Our acoustical Type N roof deck is made by perforating the flutes of a standard 3" roof deck profile.
3" N Cellular Deck:
Type "N" cellular roof deck is utilized in exposed ceiling areas where a flat bottom deck is desired for aesthetic purposes. This option can be combined with or without acoustical perforations in the flutes of the deck.
Fast Metal Deck Shop Drawings:
Our ability to provide fast steel deck approvals has made us one of the best metal deck supply and detailing companies in the United States. Our process begins with fast and direct communication with our customers and stakeholders to ensure maximum productivity and timeliness. The metal deck shop drawing process is as outlined below.
Approval Drawings
Our team gathers, reviews and interprets information from the contract bid documents.
EOR Review
Our steel deck layout is submitted to the design team for missing information or discrepancies to solve potential issues.
BOM Fabrication
Once approved by the engineer, our detailers submit their bills of material to be fabricated.
Field Use Plans
We'll issue easy to read structural steel erection plans for field use to save installation time.
Learn More about Metal Deck Shop Drawings.
Certifications
SDI Members:
We only supply products certified by SDI members that meet the the strict standards for engineering, design, manufacturing and usage of steel decks.
Made in America:
Our products are made with US made steel. When mill certificates are required, we can provide you the material's physical and chemical properties. Contact Us for more information.
UL Classified:
SDI Recommeneded Spans:
Contact us for specific product submittals and load tables
| Recommended Maximum Spans for Construction and Maintenance Loads Standard | ||||||
|---|---|---|---|---|---|---|
| Type | Span Conditon | Span | Max. Recommended Spans Roof Deck Cantilever | |||
| Ft.-In. | Meters | Ft.-In. | Meters | |||
| N DECK | 22ga. | 1 | 11'-0" | 3.35 m | 3'-5" | 1.05 m |
| 22ga. | 2 or more | 13'-0" | 3.95 m | |||
| 20ga. | 1 | 12'-6" | 3.80 m | 3'-11" | 1.20 m | |
| 20ga. | 2 or more | 14'-8" | 4.45 m | |||
| 18ga. | 1 | 15'-0" | 4.55 m | 4'-9" | 1.45 m | |
| 18ga. | 2 or more | 17'-8" | 5.40 m | |||
Construction and maintenance loads:
SPANS are governed by a maximum stress of 26 ksi (180 MPa) and a maximum deflection of L/240 with a 200-pound (0.89 kN) concentrated load at midspan on a 1'-0" (300mm) wide section of deck. If the designer contemplates loads of greater magnitude, spans shall be decreased or the thickness of the steel deck increased as required. All loads shall be distributed by appropriate means to prevent damage to the completed assembly during construction.
N Deck Attachment Pattern:
Your project Engineer will determine your attachment requirements for your design loads, building code and project requirements. The following standard 3" N Deck attachment pattern has been provided as a minimum recommendation for the product specified. The attachments should be made to from deck to support, deck sidelap to deck sidelap and seck to perimeter supports.
| SPECIFICATIONS | DETAIL |
|---|---|
| Gauges | 16, 18, 20, 22 |
| Height | 3" |
| Comparable Names | Type N, Deep Rib, 3DR, 3 N |
| Width | 24" |
| Finish | Prime Painted, Galvanized G-60, Galvanized G-90 |
