GF 2025-26

Providing and fixing Acoustic Wall Panelling in channelled wood works perforated panels of width 192mm, thickness of 15mm and length of 2400mm or as per required by the Departmental Engineer made of a high density fibre board with minimum 725 kg./m3 density substrate with a laminated facing as per the approved shade and finish and a melamine balancing layer on the reverse side. The boards shall have a special peforation pattern where the visible surface has a Helmholtz fluted perforation of 3mm width and 21mm of visible panel each. The edges of the panels shall be tongue-and-grooved to receive special clips for installation. The back of the perforated panel shall have sound absorbing non woven acoustical fleese having NRC of 0.52. The panels shall be mounted on special aluminium splines using clips provided by Armstrong and approved by the Engineer-in-Charge. Installation: Install aluminium box section (provided by others) of section 50mm x 25mm or as approved by the Engineer-in-Charge on the solid wall horizontally using screws and plugs at spacing of 600mm centre to centre. Screw the aluminium extruded keel for channelled wood works provided over the lowest and second aluminium section at an on centre distance of 600mm. Place the inside clip on the groove end of the panel along the aluminium keel and then place the tongue end of the next panel. Continue installing rows of panels by inserting the tongue into groove of the earlier inserted panel and progressively installing inside clips into the next keel till the actual height is achieved. Finish off the edges using wooden moulding of matching colour . Installation to be carried out by Trained Installation Team and installation should be carried out as per Recommended Procedure.

Supply and fixing Perculated gypsum board false ceiling using 18 mm thick of approved Quality and design suspended from the ceiling using ‘U’ shaped Galvanised Iron channel of size 25 x 25 x 0.55 mm thick at 1.20 M centre to centre on both longitudinal and cross direction for vertical support and fixing ‘U’ shaped G.I. Channel of size 50 x 30 x 0.55 mm thick at 0.60 m centre to centre on cross direction and fixing of ‘U’ shaped G.I. channel of size 50 x 10 x 0.55 mm thick at 0.90 m centre to centre on longitudinal direction respectively for horizontal support by using T.W. reapers at corners and at intermediately and fixing of plaster of paries on the panel provided as per design/pattern given by the site officer and finishing the ceiling surface with some plaster of paries materials etc. Necessary openings should be made for providing spotlights, florescent tubes in the ceiling by using kit ply 12 mm thick and opening should be covered with Acrylic panel etc. complete complying with standard specification and as directed by the dept officers. All the materials should be got approved before use work.