The following are standard architectural specifications for ceiling – mezzanine floor systems using PROMATECT®-250.
The designer must determine the suitability of the design to the application and requirements before undertaking or constructing any works relating
to the specifications and where in doubt obtain the advice of a suitably qualified engineer.
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Fire Attack From Below / Loadbearing |
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60/120* minutes fire resistance, loadbearing capacity, integrity & insulation in accordance with the criteria of BS476: Part 21: 1987.
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Supporting Structure |
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Care should be taken that any structural element by which the mezzanine floor system is supported, e.g. steel framing etc, has at least fire
resistance of 60/120* minutes and is capable of supporting the ceiling system for the required duration.
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Lining Boards |
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One/two* layers of 15mm thick PROMATECT®-250 matrix engineered mineral boards as
manufactured by Promat International (Asia Pacific) Ltd. All longitudinal joints to coincide with steel framing. All joints between adjacent
layers are to be staggered by 600mm. Standard board dimensions 1200mm x 2500mm x 15mm. |
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Fixing
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Mezzanine floor comprising of steel joists, 200mm x 65mm x 15mm x 1.5mm, at 600mm centres with tongue-and-groove chipboard floorboards of 38mm thick.
The first layer of PROMATECT®-250 boards are fixed to the steel framework using
35mm x No.8 steel screws at nominal 200mm centres and a minimum of 12mm from the board edge. Where required, one layer of
PROMATECT®-250 cover strips 100mm wide x 15mm thick are located behind the transverse
board joints. The second layer of PROMATECT®-250 boards, where required, is then lined
against the first layer and fixed to the steel framework with 50mm x No.8 steel screws at nominal 200mm centres. |
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Tests & Standards |
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The complete system along with material and framing is tested and/or assessed to meet the requirements of BS476: Part 21.
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Jointing |
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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)
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Follow-on Trades |
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Surface of boards to be prepared for painting/plastering/tiling(4)
in accordance with manufacturer’s recommendations.
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NOTES:
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- (1), (2), (3), (4), * delete as appropriate.
- Perimeter gaps will be filled with fire resistant PROMASEAL® AN Acrylic Sealant.
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