NBS Source

Durasteel Composite Membrane Plenum Ceiling

Promat UK

DURASTEEL® ceiling panels providing fire protection (240 minutes integrity, 60 minutes insulation) from fires below the ceiling.

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For use with internal walling. The DURASTEEL® boards form part of a composite ceiling, which can be constructed as:

  • A self-supporting membrane for areas up 3 x 2 m (maximum span 3 m, supported on all four edges);
  • A suspended ceiling system offering unlimited ceiling area.


DURASTEEL® ceiling panels providing fire protection (240 minutes' integrity, 60 minutes' insulation) from fires below the ceiling.

Features and benefits:

  • Promat PROMATECT®-250 panels, fitted to the underside of the DURASTEEL® ceiling, contribute to the fire insulation performance of the system.
  • Provide a fair face to the ceiling.

General information







2500 x 1200 x 9.5 mm

Uniclass 2015

Ss_30_25_10_35 Gypsum board suspended ceiling systemsPrimary


K10/220 Proprietary suspended ceiling system

Specification data - Gypsum board suspended ceiling systems Enhanced data



Inner layers

15 mm PROMATECT®-250 boards.

Installed parallel to DURASTEEL® panels with staggered joints in both directions.


Fastened to MF grid system using 32 mm Drywall screws at 200 mm centres, with 100 mm wide cover strips behind traverse joints.

Manufacturer's standard

Suspension grid

Supporting channels: 80 x 60 x 3 mm CRC at 1200 mm maximum centres welded or cleated to perimeter framing.

Traverse channels are installed coincident with joints at ends of DURASTEEL® boards.

Grid fasteners


Fire resistance (integrity and insulation)

240 minutes integrity; 60 minutes insulation.