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Application  >  Ceilings & Floors  >  Self-supporting Ceiling Membrane  >  PROMATECT®-H  >  Type 3  >  Architectural Specification
 
   
 
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Architectural Specification

The following is the standard architectural specification for self-supporting ceiling membrane 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.

Fire Attack From Above and Below / Non Loadbearing

60/120/240 minutes* fire rating, insulation and/or integrity in accordance with the criteria of BS476: Part 22: 1987 and AS1530: Part 4: 2005.
 
Supporting Structure

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.
 
Lining Boards

9mm/12mm* 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 9mm/12mm*.
 
Fixing
Perimeter galvanised steel channels will be fastened to the wall with M6 metal anchors at 500mm maximum centres. Main steel joists spanning across the wall will be positioned and adequately fixed at 610mm/1220mm* nominal intervals. Cross channels, where applicable, will be positioned at nominal 610mm centres between the main joists. Steel framework components, according to the type of ceiling listed in the tables below, will be followed.
Steel Joist Table:  FRL -/60/60  &  -/120/120
Ceiling span
up to		 Main steel joist Cross channels (C)
at 610mm intervals		 Expansion allowance
at both ends of main joints
Section size Section modulus, Z x
2400mm RHS - 60mm x 40mmx 2.5mm thick
at 1220mm intervals		 7.80cm³ C - 60mm x 32mm x 0.6mm thick Minimum 8mm
C - 100mm x 50mmx 1.1mm thick
at 610mm intervals		 7.10cm³ Not required
3100mm SHS - 60mm x 60mmx 3mm thick
at 1220mm intervals		 12.38cm³ C - 60mm x 32mm x 0.6mm thick Minimum 9mm
C - 125mm x 50mmx 1.5mm thick
at 610mm intervals		 12.80cm³ Not required
3800mm SHS - 60mm x 60mmx 4mm thick
at 1220mm intervals		 15.69cm³ C - 60mm x 32mm x 0.6mm thick Minimum 11mm
C - 150mm x 64mmx 1.6mm thick
at 610mm intervals		 20.70cm³ Not required
4000mm SHS - 60mm x 60mmx 5mm thick
at 1220mm intervals		 18.64cm³ C - 60mm x 32mm x 0.6mm thick Minimum 12mm
C - 150mm x 64mmx 1.9mm thick
at 610mm intervals		 24.40cm³ Not required
4400mm SHS - 70mm x 70mmx 4mm thick
at 1220mm intervals		 21.98cm³ C - 70mm x 32mm x 0.6mm thick Minimum 13mm
C - 152mm x 64mmx 2mm thick
at 610mm intervals		 26.10cm³ Not required
5000mm SHS - 80mm x 80mmx 4.5mm thick
at 1220mm intervals		 32.39cm³ C - 80mm x 32mm x 0.6mm thick Minimum 15mm
C - 200mm x 76mmx 1.5mm thick
at 610mm intervals		 34.70cm³ Not required
6000mm SHS - 100mm x 100mmx 5mm thick
at 1220mm intervals		 57.32cm³ C - 100mm x 32mm x 0.6mm thick Minimum 18mm
C - 200mm x 76mmx 2.4mm thick
at 610mm intervals		 56.00cm³ Not required

NOTE: Alternative steel sections may be used on the condition that they possess at least similar effective sectional modulus as listed in the above table. Please consult Promat Technical Department.

 

PROMATECT®-H cover strips, 100mm wide x 9mm thick will be fixed to the underside/both sides* of the steel framework with self-tapping screws at 500mm centres as required. The boards 9mm/12mm*, in single/two* layers, will fixed to the underside/both sides* 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 framing.

Mineral wool, 50mm/80mm/100mm* thick x 40kg/m3 / 100kg/m³ * nominal density, as required by the system specification, will be placed within the ceiling system.
 
Tests & Standards

The complete system along with material and framing is tested and/or assessed to meet the requirements of BS476: Part 22 and/or AS1530: Part 4.
 
Jointing

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)

 
Follow-on Trades

Surface of boards to be prepared for painting/plastering/tiling(4) in accordance with manufacturer’s recommendations.
 
NOTES:
  • (1), (2), (3), (4), * delete as appropriate.
  • Perimeter gaps will be filled with fire resistant PROMASEAL® AN Acrylic Sealant.
 
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