Annexure ‘A’ - CPWD

1 Annexure A GRG (GLASS FIBRE REINFORCED GYPSUM) FALSE CEILING TILES (DSR ITEM ) GRG false ceiling tiles The GRG false ceiling tiles of size 595mm x 595 mm of approved texture, design and pattern and of approved manufacturer, shall be made of Gypsum plaster of 75 microns particle size mixed with short length glass fibre filament of 20 microns 5 microns diameter to give it high strength and shall be free from harmful or any toxic ingredients. The GRG false ceiling tiles of the following two types:- a) Semi perforated 12 mm thick micro tegular edged GRG false ceiling tiles. b) Fully perforated 12 mm thick micro tegular edged or 10 mm thick square edged GRG false ceiling tiles. The GRG false ceiling tiles shall be painted with white dispersion type solvent free paint. Fully perforated GRG false ceiling tiles shall have a non-woven fabric of density minimum 30 grams per square meter pasted at the back.

2 Testing The GRG false ceiling tiles do not have any surface defect or imperfection having characteristics/specifications as stated below. a. Relative Humidity: 99 % relative humidity resistance b. Non-combustibility: as per BS 476 Part 4:1970 c. Light reflectance of 85% (minimum) d. NRC (noise reduction coefficient): (minimum) for semi perforated and (minimum) fully perforated tiles as per IS 8225 1987. e. Moisture content less than 2% f. Density 700 kg/m3 to 750 kg/m3 g. TC value (Thermal conductivity): W/m K. Frame All runners of T-Grid system as given below are made of hot dipped galvanized Iron section (galvanizing @ 120 grams per sqm including both sides) with lower exposed face of 15 mm, precoated with white polyester paint. Perimeter wall angle should be made from mm thick galvanized iron with exposed faces precoated with white polyester paint.

3 The T-Grid system should have the following items: a. Main-T grid runner of size 15 x 32 x mm and 3000mm long. b. Cross-T grid runner of size 15 x 32 x mm and 1200mm long. c. Secondary intermediate cross-T grid runner of size 15 x 32 x mm and 600mm long. d. Perimeter wall angle of size 24 x 24 x mm and 3000mm long. The frame work shall be executed in such a manner so as to form a grid of 600x600 mm as specified in the nomenclature of item. The frame work shall be suspended from the ceiling by galvanized mild steel items (galvanizing @ 80 grams per sqm) L-shape level adjuster of size 85x25x2mm having cut slit piece for sliding on to the head of main T section and should have hole so as to take the 6mm diameter fully threaded galvanized mild steel hanger rod going through it and locked with check nut.

4 The rod at the other end goes into galvanized mild steel M-6 dash fastener of size 50 mm long and 8 mm outer diameter fixed to the ceiling and locked at ends with check nuts. The lower end of the 6 mm dia hanger rod may be adjusted and locked with check nut to adjust the line and level of the false ceiling. Suspension Material The following items are used for suspension of the T Grid frame for laying of false ceiling tiles. a. galvanized mild steel M-6 dash fasteners of 8 mm outer diameter (galvanizing @ 80 grams per sqm), 50 mm long. b. galvanized mild steel 6mm dia fully threaded hanger rod (galvanizing @ 80 grams per sqm), up to 1000 mm long. c. galvanized mild steel L-shape level adjuster (galvanizing @ 80 grams per square meter) of size 85x25x2 mm. The rod shall be used in conjunction with L-shaped level adjuster bent at right angle and check nut, so as to ensure that there is no disengagement both at the bottom of rod and at the top portion which is tightened to M-6 dash fastener drilled into the ceiling slab or beam.

5 Fixing of frame and false ceiling tiles The main runners of size mm and 3000 mm long spaced at 1200 mm centers shall be securely suspended with GI fully threaded hanger rod of 6 mm dia and with L-shape level adjuster of size 85x25x2mm made from GI sheet. The hanger rod is to be suspended from the soffit at 1200 mm center to center with the aid of M-6 dash fastener suitably drilled into the slab or beam. The last hanger at the end of each main runner should not be greater than 600 mm from the adjacent wall. Then cross-T runner of section mm and 1200 mm length are to be inserted in the main-T runner at 600mm center to center distance at right angles to the main-T runner to form a grid of 600x1200mm modules. The cross-T runner of size and 600 mm length are then to be centrally inserted in between the longer cross-T runner in direction parallel to the main-T runner so as to form a grid module of 600x600mm.

6 Frame system shall rest on periphery walls/partitions on a perimeter wall angle of pre-coated galvanized iron of size of 3000mm long with the help of plastic rawl plugs at 450mm center to center distance with 40mm long screws of size in masonry wall/drywall partition and then lay GRG false ceiling tiles of size 595x595 mm in grid including cutting, making opening for services like diffusers, grills, light fittings, fixtures, smoke detectors etc. The ceiling tiles shall be placed over the galvanized iron T-section grid directly without any adhesive or cementing material. Precautions a. All the work related to plastering, conduit laying and painting etc to be completed before the false ceiling work is started and the area of false ceiling should be completely dry. b. Laying of air conditioning ducts should be completed before the suspension system for false ceiling is started.

7 C. All electrical work such as laying of electric cables should in place and completed before start of false ceiling work. d. The electrical light fixtures or diffusers etc are to be suspended independently with proper chains, wire and dash fasteners as directed by the Engineer-in-Charge. e. All GRG false ceiling tiles shall be provided symmetrically in full size in both directions of the ceiling. The remaining length in both directions should be finished with the proper boxing using GRG sheet or any other suitable material and boxing shall be paid separately. Measurement All measurement of the area is to be measured correct to a area shall be calculated in square metre correct to two decimal places. No deductions shall be made for making openings for electrical fitting, air conditioning openings or fire fighting fixtures etc.

8 Nor shall extra payment to be made either for the extra materials or labour involved in the making of such openings. Rates The rates shall include the cost of all materials and labour involved in all the operations described above including scaffoldings etc. for providing and fixing of false ceiling at all heights. Annexure B Integral Crystalline Waterproofing Admixture (DSR ITEM to ) Materials Integral Crystalline Admix is one part cementitious powder consisting of hydrophilic chemicals such as Portland cement, very fine treated silica sand and various active, proprietary chemicals. These active chemicals react with the moisture in fresh concrete with the by-products of cement hydration to cause a catalytic reaction, which generates a non-soluble crystalline formation throughout the pores and capillary tracts of the concrete.

9 Thus the concrete becomes permanently sealed against the penetration of water or liquids from any direction. The concrete is also protected from deterioration due to harsh environmental conditions. Technical Specification/Parameters The integral crystalline waterproofing admixture shall confirm to the following requirements: 1) At the manufacturers recommended dosage, (i) Material must fulfil the requirements of American concrete institute guidelines ACI-212-3R-10, the coefficient of permeability should be measured for penetration of water. Under hydrostatic pressure of psi (5 bars) to 150 psi (10 bars) for 72 to 96 hours as per DIN 1048 Part V. Reduction of water penetration should be 50 to 90%. (ii) The performance of the crystalline admixture must not be restricted by water/cement ratio of the concrete mix.

10 In other words, the crystalline admixture must perform at any water / cement ratio of the concrete mix. 2) The product has no corrosion effect on reinforcement steel according to test norm DIN V 18998. The maximum chloride content lies less than and maximum alkali content less than 3) The integral crystalline admixture must be compatible with any other concrete admixture confirming to ASTM D494 and IS 9103. 4) It will not be affected by wear abrasion of the treated concrete surface and crystalline treated concrete shall not require protection layer. 5) The recommended crystalline admixture shall be non-toxic and shall confirm to NSF 61 USA. Note - The manufacturer shall produce relevant test certificates as per relevant code as stated above. < Recommended Uses Foundations / Rafts Reservoirs Sewage and Water Treatment Plants Secondary Containment Structures Tunnels and Subway Systems Underground Vaults Parking Structures Swimming Pools Pre-Cast, Cast-in-Place and Shotcrete applications Basement Retaining Walls Direction for use Dosage - by weight of cement content per cubic meter of reinforced concrete.