When Should You Specify Marcore Dovetail Deck Instead of a Standard Metal Roof Deck?

Choosing the right steel deck for a building involves more than simply determining the required gauge and span. Architects, engineers, and contractors must also consider how the deck will be used, whether it will remain visible, the loads it must support, and whether acoustical or architectural performance is part of the design.

For many commercial and industrial buildings, a conventional metal roof deck provides an efficient and dependable structural solution. However, certain projects call for additional capabilities. That is where Marcore (also known as dovetail deck) can offer an alternative worth considering.

Understanding the differences can help project teams determine which type of deck is best suited for the building.

When a Conventional Metal Roof Deck Makes Sense

A standard metal roof deck is designed to span between structural supports and provide a base for the completed roofing assembly. Steel roof decking is widely used in warehouses, manufacturing facilities, retail buildings, offices, schools, and other commercial structures.

Common profiles such as B Deck, F Deck, A Deck, and N Deck are available for different load and span requirements. B Deck is one of the most frequently used roof deck profiles, while deeper profiles such as N Deck can be selected when longer spans are necessary.

A conventional metal roof deck is often the appropriate choice when:

• The underside of the deck is not a major architectural feature
• Standard roof deck spans meet the structural requirements
• The deck will primarily serve as the structural base for the roofing system
• The project does not require a specialized dovetail profile
• Cost and straightforward installation are primary considerations

For many buildings, there is no need to make the roof deck more complicated than necessary. Standard roof deck profiles have been used successfully for decades and remain an important part of commercial construction.

Where Marcore Dovetail Deck Is Different

Marcore is a 2 inch deep dovetail deck system developed for structural, architectural, and acoustical applications. Unlike more conventional corrugated deck profiles, its ribs form a dovetail shape that creates a clean series of linear channels when viewed from below.

Marcore can be used as a roof deck, composite floor deck, or acoustical deck, giving designers the ability to use the same general profile in several different types of building assemblies.

That versatility can make Marcore particularly useful when the steel deck needs to accomplish more than simply support the roof.

Consider Marcore When the Deck Will Remain Exposed

One of the clearest reasons to consider a Marcore dovetail deck is appearance.

In many modern commercial and institutional buildings, designers intentionally leave structural components exposed. Restaurants, educational facilities, recreation centers, offices, retail spaces, and public buildings may use the underside of the roof structure as part of the interior design.

A conventional metal roof deck has the familiar appearance of corrugated structural steel. Marcore creates a narrower, more uniform linear pattern that can provide a different architectural character.

This allows the roof deck itself to become part of the ceiling design rather than something that must necessarily be concealed.

Consider Marcore When Longer Spans or Higher Loads Are Required

Structural requirements can also influence the decision.

Marlyn Steel Decks describes Marcore as providing the ability to support heavier loads and longer spans than traditional decking systems. The actual allowable span depends on factors such as deck gauge, support configuration, loading, attachments, and the specific Marcore profile selected.

This can make a dovetail deck worth evaluating on projects where designers are attempting to increase spacing between structural supports.

Longer deck spans can potentially influence the overall structural layout of a building, although the complete system must always be evaluated by the project engineer.

Consider Acoustics as Part of the Roof Design

Large buildings with exposed roof structures can create acoustical challenges. Sound may reflect from hard surfaces and make spaces feel louder or more difficult to use.

Schools, gymnasiums, recreation facilities, auditoriums, offices, and other gathering spaces are examples where acoustical performance may be an important design consideration.

Marcore is available in acoustical configurations in addition to its structural roof and floor applications. Marlyn identifies Marcore RA as an acoustical roof deck option.

This gives designers another option when the roof structure must contribute to both structural and acoustical goals.

Think About the Entire Building, Not Just the Roof

Another advantage of Marcore is its ability to serve multiple purposes within a project.

A standard metal roof deck is primarily designed for roof applications. Marcore, depending on the specified configuration, can be used for roofs, composite floors, and acoustical systems.

That flexibility can be valuable on projects containing several types of spaces or structural assemblies.

For example, a building may require exposed roof decking in one area while using composite floor construction elsewhere. Designers can evaluate whether Marcore profiles can help provide greater continuity in the project’s structural and architectural approach.

Standard Metal Roof Deck Still Has an Important Role

The additional capabilities of Marcore do not mean it should replace conventional roof deck on every project.

B Deck, N Deck, and other traditional profiles remain practical choices for an enormous range of commercial and industrial buildings. If the structural span is appropriate, the deck will be concealed, and specialized architectural or acoustical characteristics are not needed, a conventional metal roof deck may be the more straightforward option.

The objective should always be to match the deck to the requirements of the project.

Questions to Ask When Comparing Your Options

Before choosing between conventional roof decking and a Marcore dovetail deck, project teams should consider several factors:

• What loads must the roof deck support?
• How far must the deck span between supports?
• Will the underside of the deck remain exposed?
• Is the appearance of the ceiling important to the finished space?
• Does the building have acoustical requirements?
• Could a dovetail profile provide advantages elsewhere in the building?
• Which gauge and deck configuration are appropriate for the required loads?
• What attachment, uplift, fire rating, and code requirements apply to the project?

Answering these questions early can help architects, engineers, and contractors narrow the available options before materials are ordered.

Choosing the Right Steel Deck for the Project

There is no single steel deck profile that is ideal for every building. A conventional metal roof deck may provide exactly what is needed for a warehouse or commercial roof, while another project may benefit from the structural versatility, exposed appearance, or acoustical capabilities of Marcore.

Marlyn Steel Decks manufactures traditional roof deck profiles as well as Marcore dovetail deck, composite floor deck, form deck, and acoustical deck systems. This allows contractors and design professionals to evaluate several solutions based on the actual requirements of the project.

If you are determining which steel deck profile is right for your next project, contact Marlyn Steel Decks to discuss your specifications, span requirements, loads, and application.