1. General:

The ceiling system described is to be supplied and fixed into the areas shown on reflected ceiling drawings, schedule of finishes and/or bill of quantities.

The components specified have been selected on the basis of acoustical, structural and practical grounds and meet the minimum performance and aesthetic requirements for the work.

Material performances are to be supported by Australian Test Data originated from a NATA licensed facility to Australian standards. Tenders which include alternatives without prior written approval will be deemed as non-conforming.

2. Ceiling Suspension:

The entire ceiling system is to be suspended by means conforming to the following minimum requirements.

a. Under Concrete Soffits:

i. Primary support will be by means of masonary anchors drilled and expanded into concrete soffits. Each anchor assembly shall be capable of supporting a 200 kg static load without failure. Contractors are to check allowable locations for fixing of anchors with the Structural Engineer and make due allowance for any bridging or bracing necessary to conform to the instructions of the Structural Engineer.

Approved masonary anchors will be fitted with machine punched exposed lower portion of assembly to provide location of hanger rods. The whole of the anchor and/or bridging and bracing system will be set out to a grid providing for hanger rods to drop plumb over each grid support location.

ii. Hanger rods are to be fixed in single lengths to suit finished ceiling heights. Hangers are to be supported by passing through punched lower segment of masonary anchor and over-bent through 140 degrees to prevent accidental dislodging.

The hanger rod shall be 5mm diameter galvanized steel and will be roll threaded for 75mm of its length at the lower portion, ready to accept heavy duty WF.1 hanger clips with upper and lower adjustment locking nuts as detailed.

b. Under Metal Deck Roofing:

i. Primary support will be taken from metal purlins by means of drilling the web at mid point of the webs dimension. Where purlins do not coincide with necessary hanger locations, provide adequate bridging to accomodate hangers. Should primary support require fixing to bridging or other structural members, the Structural Engineers approval must be sought prior to fixing. No fixing to roof deck will be allowed.

ii. Hanger rods are to be fixed in accordance with the specification items 2 A. i. and ii. noted prior and as detailed.

c. Bridging and Additional Supports:

i. Allow for bridging under mechanical services, structural components and the like.

ii. All bridge and brace designs are to be approved by the Structural Engineer and/or Architects prior to fixing on site.

iii. Ceiling hanger rods either bent or diagonally hung will 'not' be accepted.

iv. Provide additional hangers to main tees where necessary to support special STC rated acoustic tiles, light fittings and the like in accordance with reflected ceiling drawings, schedule of finishes or bill of quantities.

3. Ceiling Support Grid:

The ceiling suspension system is to be Acoustic & System Sales Series ...... one way exposed, one way concealed, or similar and approved system.

A. Exposed Main Tees

Part * .... main support tees will be visible in the finished work and will be of extruded aluminium. The main tee will be minimum * ... high with a face dimension of * ... Main tees are to be suspended at 1200mm centres in parallel and shall be firmly end to end jointed by means of joiner part * ... . Hanger clips part WF.1 are to support the main tees longitudinally at 1200mm centres along their length, by way of threaded rod hangers as previously specified.

Allow to provide additional hangers at main tee joins to be installed at the direction of the Architects. Allow to diagonally brace runs of main tee as necessary to eliminate deviation from straight alignment after installation.

Main tees are to be lapped into perimeter trim and cut short of such trim 50% of the bearing surface of such trim. The main tee will be supported by hangers as previously described within 600mm of any perimeter and shall incorporate a patent main tee to perimeter trim securing clip as detailed and acceptable to the Architects.

B. Concealed Spline Tees

Fit into kerfed edge of tiles at * 600/400/300mm ctr's nominal 1200 long rollformed steel splines part 2307 having a 26mm vertical leg and 20mm face. Every third concealed spline will be part 2308-03 with lock-end notching securely fixed into main tee so as to stabilize the entire grid at no more than 1200mm centres except where light trimmers part 2206-03 perform the stabilizing function.

C. Exposed Light Trimmers

At either side of each recessed light fitting instal nominal 1200mm long pre-finished tee section part 2206-03 securely fixed to main tee profiles by means of light fitting trimmer clip part 4570-03 all to extent detailed.

D. Perimeter Trim

At the perimeter of all suspended ceiling area provide extruded aluminium pre-finished shadowline wall angle trim part 4310, sized 29mm x 29mm and having an effective shadowline rebate of 10mm x 10mm. Fix trim at maximum 400mm centres using approved proprietory fastners.

4. Acoustic Tiles:

Tiles shall be 'Solaton' selected pattern (as supplied by Acoustic & System Sales ... 370 2440) consisting of modular units sized nominally 1200 x 600/400/300 x 15mm thick, having access edge profiles to long sides and square profiles to short sides as per the Manufacturers specifications.

a. Prerequisite:

Ceiling tiles shall be clearly identified within an approved and comprehensive "Product Safety Data" format to Australian Standards.

b. Prohibited Formulation:

Individual tiles shall not rely on any type of applied superficial surface coating, claimed to improve acoustical performance, density or sag resistance. The ceiling tiles must be asbestos free in all respects and evidence of this must be made available in writing by the Manufacturer.

c. Ceiling Tile Construction:

Tiles shall be of wet felted starch bonded mineral fibre construction, containing not less than 82% spun mineral fibres and 1.5% moisture proofing agent dispersed evenly throughout the tile substance.

d. Tile Density and Thickness:

Ceiling tiles are to be constructed to a density not less than 390 kg/m3 and will be face sanded to a uniform thickness of 15mm.

e. Acoustical Performance:

NRC shall be in accordance with Australian Standards and fit the range of .72 with an STC of 21 (40-44) Room to Room Method.

f. Airborne Sound Attenuation:

(Two Room Method) AS 2499 - 1981

Ceiling Attenuation Class to be not less than 43. (CAC 43)

g. Fire Hazard Performance:

The tile must meet early fire hazard performance tests, in accordance with AS 1530 Part 3, 1976 and shall conform to the following minimum requirements.

Flame Spread - Ignitability - Heat Evolved - Smoke Development 0 0 0 2

h. Light Reflectance and Surface Finish:

Paint finish to be vinyl emulsion providing light relectance Grade 1, having a reflectance of 82 - 87%.

i. Stability and Resistance to Sag:

Deflection to be no greater than 1/240th of the tile short side dimension in a controlled environment wherein the relative humidity does not exceed 80% with a maximum temperature of 30 degrees C.

j. Packaging:

Tiles are to be delivered to site in full all round corrugated board cartons. Such cartons must provide full all round protection against moisture entry and protection from reasonable transit and site handling damage.

k. Installation:

Install ceiling tiles into suspension system ensuring directional arrow on rear of tiles point the same direction throughout the installation. Where necessary, neatly cut ceiling tiles to suit part modules or penetrations using a sharp trimmer so as to provide clean edges and minimize production of airborne particles. Ensure that all tiles sit flat in the suspension system and are fully supported on all four sides.

l. Upon Completion:

Check and retify if necessary, all alignments and levels and ensure that the finished ceiling is handed over complete with all components clean, undamaged and defect free.

m. Spare Tiles:

Upon completion hand over * ... full size undamaged tiles in un-opened cartons. Spare tiles to be identical to those used in the project.

5. Warranty:

Tiles will be supplied with a manufacturers warranty as to the abovementioned performance criteria, ability to supply the initial project requirements in the scheduled time and provide replacement tiles when required without delay or unjustified cost penalty.

6. General Requirements:

No part of the ceiling suspension or grid system will be allowed to deflect more that 1/360th of the span of any component utilized.

Ceiling tiles provided and installed will not exceed deflection of 1/240th of the diagonal dimension of such tile. Any tile not conforming to this requirement will be removed from the site and replaced with a conforming tile.