D-MAC Industries, Inc. 1-800-878-3622 Your Metal Deck & Deck Accessories Service Center

D-MAC Industries o ff ers a wide variety of steel roof decks in order to meet the design requirements of virtually every commercial roof applica ti on.

The most e ffi cient (highest strength-to-weight) and widely used inch-and-a-half deep steel roof deck is the Wide Rib Roof Deck in 22 gauge. Commonly known as Type B Roof Deck, the Wide Rib deck can support common gravity roof loads at spans varying from four to six feet. Longer spans and higher load resistance are achieved by u ti lizing a steel roof deck that is either deeper or heavier (made with a thicker gauge and therefore lower gauge number).

When strength of roo fi ng materials is a concern, or when matching exis ti ng steel roof deck pro fi les that were commonly used before Type B/Wide Rib Roof Deck became prominent, an Intermediate Rib Roof Deck, or Narrow Rib Roof Deck may be required. Also known as Type F Roof Deck and Type A Roof Deck, respec ti vely, these steel roof decks are also one-and-a-half inches deep and have ribs spaced at six-inches on center (referred to as six-inch pitch). Though both of these steel roof decks o ff er a lower strength to weight ra tio. they provide more support for insula ti on board than the Type B/ Wide Rib. Type A, which is the oldest steel roof deck pro fi le, was designed to provide support for the very weak insula ti ng materials used back in the 1950s and 60s.

When large ver ti cal loads are encountered, or spans are in excess of eight feet, the Deep Rib Roof Deck is the most economical steel roof deck. As with the design of structural beams, it is usually most economical to achieve increased bending resistance by u ti lizing deeper steel roof deck sec ti ons rather than increasing the material thickness of a shallower steel roof deck. Deep Rib/Type N Roof Deck is o ft en used on building canopies because it can support the weight of roo fi ng materials over spans common to such installa ti ons within de fl ec ti on limits.

In addi ti on to sustaining ver ti cal loads, steel roof decks may also be fastened to the primary structure and to adjacent steel roof deck units, so that the steel roof deck itself becomes a diaphragm to transfer horizontal loading through the structure. This horizontal loading may be caused by wind or by seismic ac ti vity. The Steel Deck Ins ti tute publishes a Diaphragm Design Manual which details the design strength of various steel roof deck sec ti ons a tt ached to the primary structure using a variety of fasteners, such as screws, welds, bu tt on-punches, and powder actuated fasteners, all applied in a variety of pa tt erns and frequencies.

When exposed in the interior of a building, steel roof decks can func ti on as a sound-deadening barrier when perforated webs are fi lled with insula ti on. This is referred to as Acous ti cal steel roof deck.

When a fl at surface is desired, D-MAC Industries can supply Type B roof deck or Type N roof deck with a fl at sheet welded to the bo tt om of the corrugated deck sheet. This is commonly referred to as plated roof deck or cellular roof deck. When the plate is perforated and the cells of the steel roof deck are fi lled with insula ti on for sound deadening, the resul ti ng panel is referred to as cellular acous ti cal roof deck.

D-MAC Industries provides all steel roof decks with either a prime-painted, Galvanized, or galvanized and prime-painted fi nish. Since a steel roof deck is intended to be covered and protected from the elements throughout its service life, the deck coa ti ng primarily serves to protect the base metal during produc ti on, transporta ti on, job-site storage, and erec ti on. In less-severe climates, a prime-painted fi nish is usually very e ff ec ti ve in providing this temporary protec ti on. However, if transit or storage ti mes are long, or if the local environment is humid, a galvanized fi nish should be selected in order to achieve a higher level of corrosion resistance. Galvanized steel roof deck is available in either a G60 (0.6 oz/s.f. of zinc totaled over both sides of the sheet) or G90 coa ti ng. The rela ti onship between coa ti ng weight and corrosion resistance is nearly linear. That is, a G90 coa ti ng provides one and a-half ti mes the corrosion protec ti on of a G60 coa ti ng. Regardless of coa ti ng selec ti on, steel roof deck must be properly stored on site in order to prevent excessive corrosion. One side of the roof deck bundle should be elevated so that moisture can escape with the help of gravity. The high side of the bundle should be covered loosely with a waterproof membrane or tarp.

The preceding overview of steel roof decks is just that. For more details on each speci fi c roof deck pro fi le o ff ered by D-MAC, please click HERE. If you cannot fi nd the informa ti on you are looking for online, please contact us via email or telephone at 1-800-878-3622. We look forward to the opportunity to serve you!

D-MAC Industries o ff ers a wide variety of steel roof decks in order to meet the design requirements of virtually every commercial roof applica ti on.

The most e ffi cient (highest strength-to-weight) and widely used inch-and-a-half deep steel roof deck is the Wide Rib Roof Deck in 22 gauge. Commonly known as Type B Roof Deck, the Wide Rib deck can support common gravity roof loads at spans varying from four to six feet. Longer spans and higher load resistance are achieved by u ti lizing a steel roof deck that is either deeper or heavier (made with a thicker gauge and therefore lower gauge number).

When strength of roo fi ng materials is a concern, or when matching exis ti ng steel roof deck pro fi les that were commonly used before Type B/Wide Rib Roof Deck became prominent, an Intermediate Rib Roof Deck, or Narrow Rib Roof Deck may be required. Also known as Type F Roof Deck and Type A Roof Deck, respec ti vely, these steel roof decks are also one-and-a-half inches deep and have ribs spaced at six-inches on center (referred to as six-inch pitch). Though both of these steel roof decks o ff er a lower strength to weight ra tio. they provide more support for insula ti on board than the Type B/ Wide Rib. Type A, which is the oldest steel roof deck pro fi le, was designed to provide support for the very weak insula ti ng materials used back in the 1950s and 60s.

When large ver ti cal loads are encountered, or spans are in excess of eight feet, the Deep Rib Roof Deck is the most economical steel roof deck. As with the design of structural beams, it is usually most economical to achieve increased bending resistance by u ti lizing deeper steel roof deck sec ti ons rather than increasing the material thickness of a shallower steel roof deck. Deep Rib/Type N Roof Deck is o ft en used on building canopies because it can support the weight of roo fi ng materials over spans common to such installa ti ons within de fl ec ti on limits.

In addi ti on to sustaining ver ti cal loads, steel roof decks may also be fastened to the primary structure and to adjacent steel roof deck units, so that the steel roof deck itself becomes a diaphragm to transfer horizontal loading through the structure. This horizontal loading may be caused by wind or by seismic ac ti vity. The Steel Deck Ins ti tute publishes a Diaphragm Design Manual which details the design strength of various steel roof deck sec ti ons a tt ached to the primary structure using a variety of fasteners, such as screws, welds, bu tt on-punches, and powder actuated fasteners, all applied in a variety of pa tt erns and frequencies.

When exposed in the interior of a building, steel roof decks can func ti on as a sound-deadening barrier when perforated webs are fi lled with insula ti on. This is referred to as Acous ti cal steel roof deck.

When a fl at surface is desired, D-MAC Industries can supply Type B roof deck or Type N roof deck with a fl at sheet welded to the bo tt om of the corrugated deck sheet. This is commonly referred to as plated roof deck or cellular roof deck. When the plate is perforated and the cells of the steel roof deck are fi lled with insula ti on for sound deadening, the resul ti ng panel is referred to as cellular acous ti cal roof deck.

D-MAC Industries provides all steel roof decks with either a prime-painted, Galvanized, or galvanized and prime-painted fi nish. Since a steel roof deck is intended to be covered and protected from the elements throughout its service life, the deck coa ti ng primarily serves to protect the base metal during produc ti on, transporta ti on, job-site storage, and erec ti on. In less-severe climates, a prime-painted fi nish is usually very e ff ec ti ve in providing this temporary protec ti on. However, if transit or storage ti mes are long, or if the local environment is humid, a galvanized fi nish should be selected in order to achieve a higher level of corrosion resistance. Galvanized steel roof deck is available in either a G60 (0.6 oz/s.f. of zinc totaled over both sides of the sheet) or G90 coa ti ng. The rela ti onship between coa ti ng weight and corrosion resistance is nearly linear. That is, a G90 coa ti ng provides one and a-half ti mes the corrosion protec ti on of a G60 coa ti ng. Regardless of coa ti ng selec ti on, steel roof deck must be properly stored on site in order to prevent excessive corrosion. One side of the roof deck bundle should be elevated so that moisture can escape with the help of gravity. The high side of the bundle should be covered loosely with a waterproof membrane or tarp.

The preceding overview of steel roof decks is just that. For more details on each speci fi c roof deck pro fi le o ff ered by D-MAC, please click HERE. If you cannot fi nd the informa ti on you are looking for online, please contact us via email or telephone at 1-800-878-3622. We look forward to the opportunity to serve you!

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