Type B (Wide Rib) roof deck provides the best balance of strength and economy of all the 1" deep roof decks. Where rigid roofing insulation is used with B deck, a minimum 1" thickness is required. Available with nested side laps, types B, B-Dek, BV, BV-Dek, BA and BA-Dek or with interlocking side laps, types BI, BIV and BIA Available as an acoustic deck, types BA, BA-Dek and BIA are manufactured with perforations in the vertical ribs, having an NRC rating of 0.60 to 0.90 when used with rigid roofing 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 Factory Mutual approved for use as a component in Classes 1-60, 1-75 and 1-90 wind uplift construction. For additional information download FM Tables. When ratings above 1-90 are required, the Contract Documents must specify special requirements in accordance with Factory Mutual Data Sheet 1-29, Section 2.2.13 Types B-Dek and BV-Dek are ICC, FM and UL approved
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