False ceiling boards - Interior works
False ceiling work using false
Tools used for fall ceiling work :
Drilling machine, taping Knife, Scaffolding ladders, stand, self-levelling laser, rawlplug, Electric drill with clutch attachments, circular saw, cutting tool, applicator, Line threads, Straight edge, connecting clip, joint paper tape, plumb bob, spirit level, level tubes, line marker, pencil, stud interlocking tools, chisel, hammer, hack saw, crimping tool, foot lifter, screw driver, screws, tester, Level Clip, soffit cleat, level adjuster.
Cutting of false ceiling boards :
Handling and storage :
Procedure for fixing false ceiling using
false ceiling sheets :
Setting out :
Setting out and marking will be done as per approved architectural drawing and interior false ceiling design. Height of ceiling for all areas to be marked well in advance with the help of dumpy level. The same will be transferred on all the corners and chalk lines or marker lines will be marked.
Fixing of wall angles :
All wall angles should be fixed along the marked ceiling line depending on the substrate at 600 mm c/c spacing. Before fixing the wall angle, the substrate should be finished with necessary finishes as per the finishing details.
Fixing of suspended vertical Hangers :
Fixing of hangers should be done as per the approved architectural drawing layout details, by using only reputed brand of approved hanger anchorage fixing to the ceiling. All the location points of the hangers marked on the ceiling should be reviewed by Project in charge, QA engineer and consultant. After completion of all works of MEP (Mechanical, Electrical and Plumbing) and clearance certificate from MEP Engineer, hangers should be fixed at a spacing of 900 mm or 1200 mm c/c in both directions.
Frame work :
The framework to be done as per approved architectural drawings and with reputed brand of approved false ceiling material. Framing members like Main Runners and GI Channels of 0.55 mm thick should be placed at regular intervals of 900 or 1200 mm distance. Heavy weight embedded fixtures should not be resting over these frame work, instead it should be directly anchored to the ceiling with independent supports.
Framework inspection and MEP clearance :
After completion of framework, concerned areas including MEP, civil, architects and consultants should be called for inspection. Inspection request should be raised on approved formats for first fix and second fix of ceiling. After obtaining the green signal from MEP, Closure work for all cut-outs and opening voids should be started by false ceiling board installation. False ceiling boards of approved and reputed make should be fixed to the framing using gypsum screws at 200 mm c/c. For Tile ceiling, the void closure should be done by placing calcium silicate tiles on the entire grid frame.
Taping, Jointing and finishing for false Ceiling design :
The following coat should be applied over the joints. a) First Coat or Jointing Coat b) Second Coat and c) Third Coat
First coat is primary jointing method where the fiber tape is fixed over the thin joining compound applied over the joints. Another layer of jointing compound of 75 mm wide fixing also to be done over the tape to cover Screw heads of ceiling. After dried these coats, the second and third coat should applied continuously. Each and every coat is to be feathered 50 mm outside the previous layer sides of the joint. Finally smooth sanding to be done and after drying it is ready for painting works.
Final inspection :
After completion of taping, jointing, QA Engineer and site in charge should check the level and ensure, that is in true level and the work is within the acceptable limits.
Cleaning and Handover to the Painting works : After completion of all these activities, the area should thoroughly cleaned. Once the cleaning is done and approved by site in-charge a “Request for inspection” could be raised and after getting green signal from Project in charge, The area then would be handed to the painting and finishing works.
Health and safety hazards :
All necessary safety measures using PPE’s, (such as nose mask, goggles, helmets, Hand gloves, shoes and safety belts ) ladder, scaffolding stand, platforms, first aid should be available at working place, have to be followed as applicable, and all the safety measures are covered separately in the Project Safety Plan.
Inspection methodology for quality inspection :
a. Check for alignment, level and verticality using the appropriate tools.
b. Ensure the joints are sunken by 4 mm to 5 mm at the joints to the width of the fiber mesh or paper tape
c. Ensure fiber-mesh or paper tape is fixed for all horizontal corners and joints.
d. Make sure all vertical joints are fixed with corner beads.
e. The Gap between two false ceiling sheets should be restricted to or less than 5 mm.
f. Ensure horizontal bracing are provided for GI frame in partitions of more than 3 m height.
g. Ensure horizontal bracing are provided for GI channel frame in slim partitions or places where wall mounted fixtures, switch plates etc. are likely to be fixed.
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