60 minutes fire rating, loadbearing capacity, integrity and insulation in accordance with the criteria of BS476: Part 21: 1987.

Care should be taken that any structural element by which the ceiling system is supported, e.g. a beam, floor or wall, has at least an equivalent fire resistance.

9mm thick PROMATECT®-H matrix engineered mineral boards as manufactured by Promat International (Asia Pacific) Ltd. All joints to be coincident with steel framing. Standard board dimensions 1220mm x 2440mm x 6mm/9mm*.

Timber joists of minimum dimension 225mm deep x 38mm/50mm* wide for fire rating up to 60 minutes will be located at 610mm nominal intervals, spanning between two walls. Floorboards of minimum thickness 16mm/19mm* (according to the system specification) will be laid over the top side of the timber joists.

For suspended ceiling exposed grid type, perimeter galvanised steel angles 32mm x 19mm x 0.5mm thick will be fastened to the wall with 50mm x M6 metal anchors at 500mm maximum centres. Exposed primary T-grid will be positioned at 600mm nominal centres and suspended by steel wire of minimum 2mm diameter at 1200mm centres. Secondary T-grid will be positioned at 1200mm centres, simply resting on the primary T-grid at both ends. Exposed grid system should include expansion cut-outs in the main T’s.

The boards 9mm thick, will be fitted within the T-grid. Mineral wool, 30mm thick x 60kg/m3 nominal density will be placed over the ceiling.

For normal suspended ceiling, perimeter galvanised steel channels 50mm x 27mm x 0.6mm thick will be fastened to the wall with 50mm x M6 metal anchors at 500mm maximum centres. Steel primary channels 50mm x 27mm x 0.6mm will be positioned at 610mm nominal centres and suspended by steel hangers at 1200mm centres. Secondary channels will then be positioned at 1220mm centres and fixed to the primary channels.

The boards 12mm thick will be fixed to the underside side of the framework with self-tapping screws at 200mm maximum centres, a minimum of 12mm from the board edge. Board joints must coincide with the steel channels. Mineral wool, 50mm thick x 60kg/m3 nominal density will be placed over the ceiling.

The complete system along with material and framing is tested and/or assessed to meet the requirements of BS476: Part 21.

Plain butt joints between machined edges of boards. (1)
Joints filled in preparation for painting. (2)
Joints filled and taped in preparation for decoration. (3)

Surface of boards to be prepared for painting/plastering/tiling(4) in accordance with manufacturer’s recommendations.

• (1), (2), (3), (4), * delete as appropriate.
• Perimeter gaps will be filled with fire resistant PROMASEAL® AN Acrylic Sealant.