ROOF SHEETING AND ALLIED WORKS IN CONNECTION WITH DEVELOPMENT OF KESHOD AIRPORT KESHOD (GUJARAT)

Supplying and Fixing 22 mm thick Polycarbonate sheet roofing canopy: Design, Manufacture and Installation of roofing system, a complete assembly of extruded cellular structure multi cell/ multi layered UV protected polycarbonate panels Cellular structure system. Co-extruded UV protected polycarbonate panel system of minimum 22 mm thickness to ensure best performance for wind uplift and visual appearance. Panels shall be manufactured with vertical offset standing seam at both sides of the panel. Panels shall be of anti-reflective / softlite / antiglare type to prevent glare. The width of the panels shall be minimum 900 mm-1220 mm and panels with maximum width shall be preferred to minimize junctions and to ensure a leak proof system. Panels shall have minimum five to seven layers for better strength with truss bracing cell structure. Panels shall be fixed on Purlins with expansion fastener with three numbers of self-drilling screws to ensure pull out load of minimium 7000 N (7KN) tested as per ISO 6892:1998 &IS 1608:2005 (design load 250 kg/clip) / Aluminum spacers and connected with polycarbonate U connectors to interlock the panels with snap on / click-on / grip lock mechanism to ensure maximum uplift capacity. Panels will be sealed with mill finished aluminium U profiles at the ends. Each panel shall be with opaque and clear combination of louvers inside the single panel i.e. with transparent body and opaque layers in between layers for better ambience and increase shading and variable daylight and minimising direct sunlight in the noon. Polycarbonate panels also shall have Yellowness Index as per ASTM D 1925 when tested on a sample exposed to UV for 500 Hours as per ASTM G 155. The polycarbonate panels must satisfy Dart drop impact test as per IS 14443-97 shall show no sign of breakage on Polycarbonate sheets which have been exposed to UV for a min. of 500 Hours as per ASTM G 155. The panels shall be fixed over structural steel / MS purlins and be secured with Snap- On connectors at all levels including all accessories like screws, trims etc. complete to make a water tight roofing canopy conforming to specifications and directions of Engineer-in-Charge. End-cap/Aluminium U-profile (mill finish) for ends. ( Continue )....

( Continue from Above)..... a) The full system shall be fitted on MS purlins with appropriate purlin spacing. b) Color: As approved by Engineer-in-Charge. c) Light Transmission –variable type d) Solar factor / Shading Coefficent. 49% - 63% / 0.56 - 0.72 e) U-Value – 1.5 to 1.8 w/m2K. & SHGC 0.2 - 0.4 f) Panels shall be fixed on purlins with Aluminium clips / brackets and PC connectors g) Snap-on connector to interlock the panels shall have single/double tooth mechanism to ensure maximum uplift capability. h) Panels shall have End-cap/ Aluminium U-profile/ Glazing bar for ends as per requirement. i) Panel shall be co-extruded UV protected j) Panel shall be co-extruded with special anti-glare / anti reflective compound to make it antiglare/ soft light to prevent glare and sun streaks. k) Panels shall be fixed over structural steel/ MS purlins conforming to the technical specifications and as per approved drawings. l) Panel shall be manufactured in a manufacturing facility with approved quality assurance procedure as per ISO 9001 & ISO 14001. m) Polycarbonate sheet sample should be exposed to UV for minimum 2000 Hrs n) Third Party test to be submitted to Engineer in Charge / Architect o) Panel Manufacturer shall provide warranty against any manufacturing defects for a period of 10 years (minimum) and manufacturing experience of standing seam panel system for a period not less than as required in warranty.

Designing, Providing and fixing “SELF SUPPORTED” CONCEALED FIX ALLUMINIUM STANDING SEAM ROOFING SYSTEM 0.9mm THICK AA 3004 ALUMINIUM ALLOY. KEY ROOF PERFORMANCES: The entire roofing system shall be designed to achieve maximum thermal U value of 0.27 W/m2K and Sound transmission class (STC) of minimum 41 ± 3 dB. Installation of 65/400 Aluminium Standing Seam Roofing System or equivalent with outer sheet having finish of: a) PVF2 Finish with inner sheet comprising of Trapezoidal Galvalume steel liner sheet (GSM 275) 550 MPa, 0.55 mm TCT 1000 mm total cover width 35mm deep ribs spanning up to 1500 mm centre (multiple spans). The finish to the exposed surface of the liner will be polyester coating with film thickness of 23μm +/- 2 μm. The insulation shall be Rockwool 150 mm thick (laid in two layers of 100 & 50 mm) with vapour Control layer made up of Double-sided Aluminium foil Rockwool with minimum density 60 kg/m3.( detailed Technical parameters mentioned in Sl (ii) above) AND OUTER SHEET comprises of profiled sheeting of Aluminium self-supported standing seam roof system manufactured from Aluminium alloy AlMnlMg1 as specified in BS EN 1396: 2007 (comparable AA 3004), minimum material thickness of 0.9 mm and PVF2 finish on the exposed surface. The colour to be approved by the Engineer-In-Charge. The material properties shall be as follows: Ultimate tensile strength: minimum 200 N/mm2, 0.2% Proof Stress: min 185 N/mm2, Modulus of elasticity: 70,000 N/mm2. The general roof-construction shall comprise from top to bottom as given below:

ALUMINIUM STANDING SEAM PROFILE, DOUBLE ARCHITECTURAL INSULATED STANDING SEAM STEEL ROOFING SYSTEM IN SEVEN LAYERS i) Top Layer – 65/400 of Straight / Tapered / Curved profiled sheeting manufactured from Aluminium grade alloy AA 3004, minimum thickness of 0.9 mm and 25 ±5 μm PVDF Finish and colour as per client/architect choice on the exposed surface and finish as approved by Engineer-In-Charge. Sheets are to be laid in single length (straight sheet) to meet the requirement of the building roof geometry. The profile should have 3 micro ribs mini ribs to provide additional strength at the pan, and material test certificate (MTC) to be submitted. The support Aluminium clip shall be manufactured from extruded Aluminium alloy 6061 T6 in accordance with BSEN 755 part 2. Each Aluminium clip shall be coupled with a 5mm thick black polyamide thermal barrier base pad. The material properties shall be as follows: Ultimate tensile strength: minimum 200 N/mm2, 0.2% Proof Stress: min 185 N/mm2, Modulus of elasticity: 70,000 N/mm2.Aluminium sheet to be laid in Single length to meet the requirements of the building geometry (straight sheet) and fixed on Aluminium clip and which is fixed to steel with SS-304 screws. ii) Second Layer: Insulation layer – Rockwool (Stone Wool) Insulation of 150mm thickness x minimum 60kg/m3 density. (refer technical specifications for Technical Parameters) iii) Third Layer: Top Hats - Galvanized steel Top hats of min. thickness of 1.6mm and to be installed over the VCL, cement board, with min. yield strength of 240 Mpa and to be fixed with SS Steel fasteners. iv) Fourth Layer : Vapour Control Layer - Scrim reinforced Polyethylene film heavy duty type Vapour control layer should be laid providing a minimum water Vapour resistance of 336MNs/g and water permeability of 0.61g/m2/day” having specific weight of 200 gsm. v) Fifth Layer: Cement Board/Particle Board - One layer of 12 mm thick cement/Particle board layer to be laid over GI bracket. vi) Sixth Layer: Brackets - Galvanized steel bracket of min. thickness 2mm to be provided over liner, with min. yield strength of 240 Mpa and to be fixed with SS Steel fasteners. vii) Seventh Layer - Bottom sheet – Trapezoidal Galvalume 0.50mm thick profile sheet of 1050-1050 mm effective cover width and 28-35 mm height ribs with pan at 200-250 mm centre-to-centre. The feed material is manufactured out of nominal 0.50 mm Total Coated Thickness (TCT), Histrength steel with min. 550 MPa yield strength. Metallic hot dip coated with Aluminium-Zinc alloy (55% Aluminium, 45% Zinc) as per AS 1397 - Zincalume AZ150 (Min. 150 gms/sq.mt total on both sides) Fixed to the purlins with self-drilling screws SS 304 at 500mm spacing with all required system accessories such as Aluminium clips, flashings, eaves, gables, etc., as per shop drawings, specifications and as directed by the Engineer-In-Charge.

ALUMINIUM STANDING SEAM PROFILE, DOUBLE ARCHITECTURAL INSULATED STANDING SEAM STEEL ROOFING SYSTEM IN FOUR LAYERS i ) Top Layer – 65/400 of Straight / Tapered / Curved profiled sheeting manufactured from Aluminium grade alloy AA 3004, minimum thickness of 0.9 mm and 25 ±5 μm PVDF Finish and colour as per client/architect choice on the exposed surface and finish as approved by Engineer-In-Charge. Sheets are to be laid in single length (straight sheet) to meet the requirement of the building roof geometry. The profile should have 3 micro ribs mini ribs to provide additional strength at the pan, and material test certificate (MTC) to be submitted. The support Aluminium clip shall be manufactured from extruded Aluminium alloy 6061 T6 in accordance with BSEN 755 part 2. Each Aluminium clip shall be coupled with a 5mm thick black polyamide thermal barrier base pad. The material properties shall be as follows: Ultimate tensile strength: minimum 200 N/mm2, 0.2% Proof Stress: min 185 N/mm2, Modulus of elasticity: 70,000 N/mm2.Aluminium sheet to be laid in Single length to meet the requirements of the building geometry (straight sheet) and fixed on Aluminium clip and which is fixed to steel with SS-304 screws. ii ) Second Layer: Insulation layer – Rockwool (Stone Wool) Insulation of 150mm thickness x minimum 60kg/m3 density. (refer technical specifications for Technical Parameters) iii ) Third Layer : Vapour Control Layer - Scrim reinforced Polyethylene film heavy duty type Vapour control layer should be laid providing a minimum water Vapour resistance of 336MNs/g and water permeability of 0.61g/m2/day” having specific weight of 200 gsm. iv ) Fourth Layer - Bottom sheet – Trapezoidal Galvalume 0.50mm thick profile sheet of 1050-1050 mm effective cover width and 28-35 mm height ribs with pan at 200-250 mm centre-to-centre. The feed material is manufactured out of nominal 0.50 mm Total Coated Thickness (TCT), Histrength steel with min. 550 MPa yield strength. Metallic hot dip coated with Aluminium-Zinc alloy (55% Aluminium, 45% Zinc) as per AS 1397 - Zincalume AZ150 (Min. 150 gms/sq.mt total on both sides) Fixed to the purlins with self-drilling screws SS 304 at 500mm spacing with all required system accessories such as Aluminium clips, flashings, eaves, gables, etc., as per shop drawings, specifications and as directed by the Engineer-In-Charge.

Aluminium Flashing Supplying and fixing of Aluminium Flashing 0.9 mm thick: Flashings manufactured from aluminium alloy AA 3004(AlMn1Mg1) as specified in BS EN 1396: Flashing girth to be 400mm to 578mm. Including forming, proper welding at joints, fixing and finishing, complete in all respects;

Aluminium Flashing (Around Smoke Extractor, Roof Hatch, Shaft, etc) Supplying and fixing of Aluminium Flashing 2 mm thick: Flashings manufactured from aluminium sheet in AA1100 / 1200 grade alloy with PVDF/ powder coated finish (as approved by Client) matching the roof sheet colour,: Flashing girth to be upto 600mm. Including forming, proper welding at joints, fixing and finishing, complete in all respects; including provision of maintenance pathway (minimum 1.2m width) with 150mm thick high-density rigid insulation of 120kg/m³ density below,along with Z-spacers beneath weld joints for additional strength, with remaining roof built-up similar to the top roof sheeting system;and including treatment to vertical faces of upstand swith built-up comprising trapezoidal liner sheet,vapour control layer (VCL), 60kg/m³ density insulation and cement board cladding, complete with necessary supports, fixing arrangements, jointing and finishing, all as per specifications and approved drawings.

Aluminium insulated gutter Supplying and fixing of Aluminium insulated gutter of 2mm thickness with built-up comprising of cement board, Rockwool insulation, liner and gutter expansion joints @ 12m. It includes necessary down take spout with diameter 160 mm at required intervals & other accessories like Cover plate, end caps, and welding at joints to ensure leak-proof performance. Dye Penetration test to be conducted wherever Aluminium welding has been done. All complete as per direction of Engineer-In-Charge.

The Girth of gutter up to 2400mm

The Girth of gutter up to 1200mm