The following is the standard architectural specification for timber floor fire protection ceiling system using PROMATECT®-H.
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 should obtain the advice of a suitably qualified engineer.
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Fire Attack From Below / Loadbearing |
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30/60/120 minutes* fire rating, loadbearing capacity, integrity and 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 ceiling system is supported, e.g. a beam, floor or wall, has at least an equivalent
fire resistance.
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Lining Boards |
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6mm/9mm/12mm/15mm* 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/12mm/15mm*. |
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Fixing
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Timber joists of minimum dimension 225mm deep x 38mm wide for fire rating up to 60 minutes, or 50mm wide for fire rating up to 120 minutes will
be located at 610mm nominal intervals, spanning between two walls. Floor boards of minimum thickness 16mm/19mm* (according to the system specification)
will be laid over the top side of the timber joists.
Where required and in accordance with the system specification, PROMATECT®-H cover strips,
will be fixed to the underside of the timber joist with clout nails or woodscrews. For single layer board system, these cover strips will be located
and fixed at the transverse board joints.
Single/double* layer PROMATECT®-H with thickness 6mm/9mm/12mm/15mm* will be fixed to
the underside of the floor with clout nails or screws according to the system specification. For double layer system, the joints between the adjacent
layers will be staggered by at least 300mm.
Where required and in accordance with the system specification, mineral wool of thickness 40mm/50mm* x 60kg/m3 nominal density will be placed over
the PROMATECT®-H boards. |
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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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