B Deck

Strength-to-weight performance leader for commercial roof spans

B Deck is available in standard and cellular profiles

Type B deck is a wide-rib structural roof deck ideal for a range of applications. This high-performance, cost-efficient steel roof decking choice meets multiple steel construction project needs with a variety of options. B deck metal decking is available in standard and cellular profiles, with acoustical or vented, and interlocking or nested options. Type B metal roof decking is among our most flexible 1½-inch deep roof deck.

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Standard B Deck

Type B roof deck provides the best balance of strength and economy of all the 1½-inch-deep roof decks. A minimum 1-inch thickness is required when rigid roofing insulation is used with B deck.

B deck steel decking is available in lengths from 6 feet to 40 feet. Please check with your local New Millennium facility for lengths outside these parameters. B deck metal roof profiles conform to ASTM A1008/A1008M for uncoated and painted deck, and A653/A653M for galvanized deck. B deck metal deck is approved by UL and ULC, and is listed in the UL and ULC Fire Resistance Directories.

B deck roof deck has yield strength up to 80ksi. Refer to our Steel Roof and Floor Deck Design Guide for the minimum yield strength used for each steel deck type. Contact New Millennium for availability of higher yield strengths when required, or use our deck specification tool to view load tables with commonly available non-standard yield strengths and/or gages.

Standard B Deck

Standard B Deck Acoustical

Standard B Deck Vented

Types B, B-Dek, BV, BV-Dek, BA and BA-Dek available with nested side-laps. Types BI, BIV and BIA available with interlocking side-laps
Available as an acoustical deck, types BA, BA-Dek and BIA are manufactured with perforations in the vertical ribs, having an NRC rating of 0.50 to 0.95 when used with rigid insulation, as tested in accordance with ANSI/ASTM C423 and E795
Available as a vented deck, types BV, BV-Dek and BIV are manufactured with slot vents in the bottom flutes (to be specified when venting is required for cementitious insulation fill). The openings for types BV and BIV can be specified from 0.5% up to 1.5% of total surface. The openings for BV-Dek can be specified from 0.25% up to 2.0% of total surface
Also available with rolled-in hanger tabs (non-vented types only)
Type B roof deck is FM-approved for use as a component in Classes 1-60, 1-75 and 1-90 wind uplift construction. When ratings above 1-90 are required, the Contract Documents must specify special requirements in accordance with FM Data Sheet 1-29, Section 2.2.13
Types B, BI and B-Dek are ICC-, FM- and UL-approved

RED® Rolling Electric Deck Tool being clinched by erector.

Clinch the strongest interlocking B-deck side-lap connections

RED™ side-lap connection for interlocking B-deck (BI)

RED® Side-lap Connections

Cellular B Deck

B-Dek Cellular is a 1½-inch-deep cellular structural roof deck that provides a support surface for various types of roofing materials. The metal deck’s liner panel features self-aligning nestable side-laps to provide a finished ceiling aesthetic with concealed fasteners. B-Dek Cellular Acoustical metal deck features a perforated liner panel, providing an NRC of 0.70 when used with a rigid insulation. Fiberglass acoustical batts are installed in the B-Dek Cellular Acoustical steel deck cells at the factory under controlled conditions.

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B-Dek Cellular (25.5 CW)

B-Dek Cellular Acoustical (25.5 CW)

B-Dek Cellular (37.5 CW)

B-Dek Cellular Acoustical (37.5 CW)

Available in 24½-inch cover width
Available in seven steel gage thicknesses, including various combinations of top and bottom section thicknesses (see load tables)
Used as a secondary structural member to provide for lateral force distribution to the structure’s vertical force resisting system
Top and bottom sections are supplied with galvanized finish, in a variety of coating weight options. Only the exposed side of bottom sections are available with an additional finish of gray primer
B-Dek Cellular Acoustical available with optional plastic lath to protect the acoustical properties of the deck when painting in the field
Types B-Dek Cellular and B-Dek Cellular Acoustical are ICC-approved