This specification is based on recognized manufacturer s specifications and guidelines for prefinished steel wall systems.

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1 016/09/13 1/5 1.0 PURPOSE This specification describes the minimum requirements for the supply and installation of prefinished steel wall siding complete with all accessories conforming to the wall system as shown on the project drawings. This specification supplements the requirements of the Building Code and regulations. This specification is based on recognized manufacturer s specifications and guidelines for prefinished steel wall systems..0 SUBMITTALS Submit shop drawings for review by Vale, prior to start any shop fabrication..1 QUALITY ASSURANCE Qualifications Execute this Work by a member of Canadian Sheet Steel Building Institute (CSSBI) and employing adequate plant, equipment and tradesmen proficient in this type of Work. Design Criteria Design siding system in accordance with the Building Code (OBC) and with the Supplement to OBC design data to support positive and negative wind loads, earthquake loads, snow loads, and any other internal or external pressures, if applicable, and: - Ensure that the deflection of the walls does not exceed 1/90th of span, when the spacing of structural supports is less than 5 feet and will not exceed 1/180th of span when the spacing of structural supports is over 5 feet. - Do not rely on the wall steel siding to act as lateral diaphragm for structure lateral stability. Design independent system to maintain the structure lateral stability. 3.0 MATERIALS Suppliers of prefinished steel wall siding shall be proficient in the manufacture, quality assurance, and supply of these products. Example of acceptable suppliers: Vic West Steel Inc. Canadian Metal Rolling Mills Ltd. James River Steel

2 016/09/13 /5 3.1 EXTERIOR SHEETS, FLASHING AND ACCESSORIES Form exterior sheets from zinc coated steel in accordance with American Society for Testing and Materials ASTM A653/A653M Grade 30 (with minimum yield strength of 30Mpa {33 KSI }), with a zinc coating designation of Z75 (75 g/m ) minimum; with finish applied before forming. Minimum thickness, profile, applied finish, and colour of sheets are indicated on the project drawings. Provide closures, flashings, window sills, fascias, fillers, corner pieces, etc. on exterior of (G90=0.90 oz/ft ) Z75 minimum zinc coated steel to match adjacent siding where exposed to view. Provide metal thicknesses as required, but not less than inches core nominal thickness. 3. SUBGIRTS Ensure subgirts have minimum core nominal thickness of inches, with a zinc coating designation of (G90) Z75 minimum. 3.3 LINER SHEETS Form liner sheets from zinc coated steel in accordance with ASTM A653/A653M Grade 30, with (G90) Z75 minimum zinc coating, with finish applied before forming, with caulking interlocking male and female lips on edges, minimum core nominal thickness of inches, unless noted otherwise on project drawings. 3.4 BLANKET INSULATION Fibreglass AF110 insulation with an R factor of 3.81 per inch thickness manufactured by Fibreglass Canada Ltd or approved equal. Insulation thickness as shown and detailed on project drawings. Minimum factor of R0 for walls and roof. 3.5 FASTENERS Use exterior fasteners of 18-8 stainless steel, #14 self-tapping sheet metal screws with nylon coated heads and rubber washers, manufactured by the Atlas Bolt & Screw Company, Canada Limited. Match nylon coating to colours of siding in which fasteners are located. Fasten interior sheets, subgirts, corner stiffeners, etc. with type "B" hex head 18-8 stainless steel self-tapping sheet metal screws. Ensure siding and flashing are sealed tight at the fasteners locations.

3 016/09/13 3/5 3.6 SEALANT Use one component, Butyl-Polyisobutylene base sealant, in accordance with CGSB 19-GP-14M for concealed locations. Use one component, silicone base sealant, in accordance with CAN/CGSB M87 for exposed locations. Otherwise, according to Specification SPEC entitled "Sealants". 3.7 CORNER STIFFENERS Provide all corner stiffeners required. Fabricate stiffeners from zinc coated steel with G75 minimum zinc coating, thickness as required. 4.0 INSTALLATION Erect wall system according to the project drawings and to manufacturer's instructions. Apply a continuous bead of caulking on faces of supports at top and bottom of siding to provide a complete seal. Place liner sheets tightly against supports, and secure with self-tapping screws at 1 inch centre to centre. Install continuous horizontal subgirts at 5-0" centre to centre maximum spacing and insulation according to manufacturer's standards. Provide thermal breaks between subgirts and liner sheets. Direct metal-to-metal contact between liner sheets and exterior sheets is not acceptable. Install corner support, interior corner pieces, closures, etc. with self-tapping screws. Install exterior face sheets in lengths according to project drawings. Secure to subgirts with selftapping screws according to the manufacturer's standards. Install corner pieces, formed steel closures, sills, flashings, etc. where shown and where required. Provide formed steel closures around all openings. Use moulded closures for uninsulated buildings. Bead all flashings, closures and corner pieces with sealant. Caulk all openings, joints and around perimeter to provide a weather tight installation. Remove excess caulking. Damaged or marred siding surfaces and exposed cut raw edges are not acceptable.

4 016/09/13 4/5 5.0 REFERENCE DOCUMENTATION The following documents are related to this specification and shall be used to their latest revision: SPEC SPEC CAN/CSA S CAN/CSA S136S1-04 CSSBI SSF No.6 NBC OBC ASTM A653/A653M Flashings Sealants North American Specifications for the Design of Cold Formed Steel Structural Members Supplement to S136 - Canadian Sheet Steel Building Institute Recommendations (CSSBI) Metallic Coated (Galvanized) Sheet Steel for Structural Building Products National Building Code of Canada (NBC) Building Code (OBC) Standard Specification for Sheet Steel, Zinc Coated (Galvanized) or Zinc-Iron Alloy Coated (Galvanized) by Hot Dip Process

5 016/09/13 5/5 6.0 REVISION AND TRANSITION NOTES Revision notes describe: what was changed, and if applicable, why it was changed, and the plan to implement the change, including whether changes are retroactive. Note: The revision notes are a summary of the changes and may not necessarily be a complete list. A risk code is entered for each revision and if applicable, the revision notes will describe how risk was addressed for the revision. Risk Code A Risk Category This revision is a minor change and/or introduces no risk. B C Risk has been addressed for this revision by the reviewer and approver. Low risk or no new hazards identified. For this revision, a PHR or other risk management tool has been used to address risk and minimize hazards. This risk assessment has been documented and is available through Central Engineering. Rev 1 Revision Notes Document format and number changed due to Vale Engineering Document Program changes in 011/01. Previous Standard number was Rev 4 Document Reviewed Format updated Minor clarifications added Risk Code Approved by Reviewed by Issue Date YYYY/MM/DD --- AA AA 01/11/30 A A.Alaeddine A.Rafi 016/09/13