fire wall systems United Steel Deck, Inc.’s fire resistant wall panel systems meet the criteria of ASTM standard E119 and are classified as nonbearing walls by Underwriters Laboratories Inc.® (UL). Design No. U646, U647 and U648 cover 1,2, and 3 hour rated walls respectively. Staggered layers of gypsum wall board, UL category (CKNX), are field applied; the number of layers varies with the rating. Approved combinations of face and liner panels afford architectural flexibility. The systems are rated when exposed to fire from either side. Competitive gage combinations are approved. Contact your local USD sales representative for further information.
acoustic systems Title 29, Part 1910 - Occupational Safety and Health Standards (OSHA) lists permissible noise levels and exposure periods. Recommended background noise levels for different environments are listed in many texts, e.g. the ASHRAE Handbook and Product Directory. Lightweight field assembled insulated wall panels help attain these levels. The panels inhibit airborne sound transmission through walls and reduce “bounce back” noise by absorbing sound energy within an enclosure. Sound Transmission Class (STC) and Noise Reduction Coefficient (NRC) ratings are single value indicators of these tow properties over the frequency range - 125 to 4000 HZ. The ratings are preliminary performance barometers. STC ratings are generated using ASTM test method E90 and classified using E413. NRC ratings are developed using ASTM test method C423. United Steel Deck, Inc.’s acoustical liner panels are perforated with 1/8 inch holes on a 3/8 inch center staggered pattern. The combination of perforated liner, 2 inch fiberglass insulation, and face panel will provide NRC ratings greater than, .8 and STC ratings greater than 30. Unperforated liners will provide even higher values if STC is the only objective. A mesh spacer isolates the insulation from the liner surface. A vapor retarder is provided to protect the insulation.
explosion relief systems Explosion venting wall systems limit damage in structures or rooms that contain explosion hazards. These systems supplement normal prevention measures. The wall is designed to release at a specific internal pressure and to quickly vent the explosion force; the remainder of the enclosure is designed to contain that pressure. United Steel Deck, Inc.’s light weight construction conforms to Factory Mutual Research (FM) Approval Standard No. 4440. (Do not adapt this system to roofs). Recommended design pressures, required vent areas, maximum panel weights, and building clearance restrictions can be found in building codes, in FM Loss Prevention Data 1-44, or in NFjPA No. 68. Design release pressures should be checked for compatibility with specified wind loads. Unless more stringent criteria control, we suggest: Design release pressure = 20 psf Venting wall allowable deflection = L/240 Maximum wall weight = 7.5 psf Fasteners are FM approved and use collapsible washers. Accessories such as restraining cables, weight bearing shelf angles, and fastener stiffening bridges can be provided. Contact your local sales representative for complete information.