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Home arrow Ceiling system - Category 3 arrow 1.5-hour fire rating flushed jointed gypsum ceiling
1.5-hour fire rating flushed jointed gypsum ceiling Print E-mail

ImageScrewed-up concealed grid ceiling, lined with 3 layers of 15mm / 15.9mm fire rated gypsum plasterboard






Scope of use:
  • Internal gypsum ceiling for dry areas that require 1.5-hour fire rating level (living room, dining room, bed room, work room, recreation room, etc.), suitable for all types of buildings (houses, hotels, restaurants, offices, shops, supermarkets, shopping centers, schools, hospitals, factories, warehouses, etc.).

System configuration:

  • Ceiling frame is made of high quality galvanized or aluminium/zinc coated cold rolled steel components: Top Cross Rail primary sections with maximum spacing at 900mm centers, Furring Channel secondary sections (perpendicular and connected to primary sections by TCR/FC connectors) with maximum spacing at 610mm centers. Primary sections are suspended from upper concrete slab or steel/timber joists via suspension bracket + suspension rod + adjustable suspension clip with maximum spacing at 900mm centers.
  • Steel frame complies with Australian - New Zealand standards AS/NZS 1397 (steel sheets & trips, galvanized and zinc-aluminium coated), AS/NZS 4600 (cold rolled steel structure) and AS/NZS 2785 (suspended ceilings - design & installation). 
  • Screw up 3 layers of 15mm / 15.9mm Fire Resistant gypsum plasterboard to secondary sections with the board lengths perpendicular to secondary sections. Stagger board joints between 1st layer and 2nd layer and 3rd layer. Screw length is minimum 30mm (for 1st layer), 45mm (for 2nd layer), and 60mm (for 3rd layer). Maximum screw spacing is 200mm in the field of the boards, and 150mm at board ends.
  • 15mm / 15.9mm Fire Resistant gypsum plasterboard complies with American standard ASTM C36 or C1396 / Bristish standard BS 1230 / Australian - New Zealand standard AS-NZS 2588.
  • Boards to be flush jointed with MARCO perforated paper tape and plaster based jointing compounds. Jointing treament consists of 3 separate coats (1st coat = 150mm wide, 2nd coat = 200mm wide, 3rd coat = 275mm wide), achieving level 4 under American standard GA-214 / Australian - New Zealand standard AS/NZS 2589-1.
  • MARCO perforated paper tape and gypsum plaster based jointing compounds comply with American standard ASTM C475.
  • Caulk all perimeters (between walls/partitions and ceilings, penetrations through ceiling surfaces for electrical wiring and other engineering service systems, etc.) of the fire rating gypsum ceiling with fire tested sealants.
  • No putty / mastic, no painting over the board surfaces.
  • If improved thermal and sound insulation is required, 1 layer of glasswool 50mm thick 12kg/m3 will be fit snugly on top of the back of the 1st lining board.

Assurance:

  • Installed systems are assured to be free of any defects related to warping - sagging - cracking of lining boards, cracking of joints during 5 years when utilised strictly under thorough guides provided by Tong Hy Co., Ltd. (if fire does not occur).
  • Service life of 1.5-hour fire rating internal gypsum ceiling is over 50 years (if fire does not occur).
 
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