Ceilings or Overheads
The following installation guide is provided to answer frequently asked questions
regarding the assembly of PROMARINE® fire protection ceilings or overheads.
B15 RATED CEILING
This example is based on a B15 rated ceiling, using 16mm thick PROMARINE®-450, bonded
both sides with .030" or 0.8mm thick high pressure laminates. Maximum panel dimension
is 471/2" x 951/2" or 1206mm x 2425mm. Prior to the installation of PROMARINE®-450
‘B15’ ceiling and, indeed, the ordering of the materials, the orientation of the
ceiling grid must be decided. Several factors must be taken into account, i.e. panel
wastage, accessibility etc. Consultation with the Marine Department prior to this
decision is available.
Detail 1 - Ceiling Perimeter Channel
Prior to the fitting of ceiling perimeter channels (PC-30-T), existing wall panels
must be marked with the required ceiling height.
 Ceiling perimeter channels are then cut
to the required length and attached to the existing wall panels using 1/2" or 12.7mm
long screws. At corners, ceiling perimeter channels can either be mitered or cut
square.
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Detail 2 - Adjustable Hanger Assembly
Adjustable hanger assemblies (HA-40) should be installed at 48" or 1220mm maximum
centers. The adjustable hanger assembly is attached to the hanger angle (H300) with
two self
 tapping screws and should be lightly secured
to allow movement. Hanger angles are produced to suit the void space dimension,
i.e. H300 for up to 9" or 228mm void spaces, and are either welded or bolted to
the overhead stiffeners. As the adjustable hanger assembly can accommodate discrepancies
of at least 1" or 25mm in any direction, the positioning of the hanger angle does
not require to be exact. The hanger bracket should also be left loose at this stage.
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Detail 3 - Main Channels
The main channels (PC-40-U) are supported between the ceiling perimeter channels
and the adjustable hanger assemblies using three way (CB-3-40) and/or four way connector
joints
 (CB-4-40) together with the hanger bracket
as shown. Center main channels should be installed first. After cutting to the required
length, connector joints should be attached at either end. This is achieved by folding
the upright legs onto the channel with standard pliers. Main channel is then loosely
attached to the adjustable hanger assembly using the M6 spindle bolt provided. Each
end of the channel can now be secured to the ceiling perimeter channel and/or other
main channels as required, using the same process mentioned above. If the span is
longer than 96" or 2440mm, two main channels can be joined together with a CB-2-40
straight connector. Again, the upright legs are simply folded into position using
pliers.
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Detail 4 - Single Omegas
Single omegas (RJ-28-S) are used to support the ceiling panels by clamping them
to the main channels.
 After cutting to required length, omegas
should be lightly attached to main channels with screws. All main channel and adjustable
hanger assembly screws and bolts should now be securely tightened.
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Detail 5 - Ceiling Panel Installation
Ceiling panels can now be trimmed to required dimensions and installed into the
ceiling grid, commencing from one side of the room. The loose fitting omegas should
allow panels to be slotted into position.
 However, use of ‘C’ clamps is recommended
to support one end of each panel while installing the adjacent panel. The perimeter
of the ceiling is supported by attaching internal angles (PA-30-B) to the existing
wall panels. All omega screws should now be securely tightened.
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Detail 6 - Cover Strips
The system is complete when the cover strips are introduced to ‘hide’ profiles.
 Omegas are concealed with PV-03 or PV-04
cover strips, or highlighted with a PS-24 insert. Internal angles can be covered
with a PV-05 cover strip. All cover strips are simply pushed into position.
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