074113_Preformed_Metal_Roof_Panels_SO.doc

USDA FOREST SERVICE

PROJECT SPECIFICATIONS

section 074113

PREFORMED METAL ROOF

1. Part 1 - GENERAL

1.01 summary

The Plumas National Forest, located in Quincy California is seeking to purchase metal roofing the main Supervisor’s Office. The structures and materials are as described below. The final lump sum shall include delivery.

1.02 Submittals

A. Submit catalog cuts or brochures, fully describing all materials, and color samples.

B. Wind Uplift: The roof panel manufacturer shall submit a fastening schedule or supporting calculations showing that the roof panels, clips and fasteners comply with CBC Section 1613 wind uplift requirements. System shall be designed for the values supplied on the structural drawing or code required wind load, whichever is greater.

2. Part 2 – PRODUCTS

2.01 Materials

1. Roofing panels: 26 gauge steel, baked enamel, embossed finish

2. The style shall be a concealed fastener metal roofing system with either 12” or 16” wide panels with raised, interlocking ribs.

3. Panels shall be manufactured from rolled steel conforming to ASTM A792, Grade C. Minimum thickness shall be 26 Gauge.

4. Color shall be similar to Federal Standard Color 595B-14109 or AS APPROVED BY THE GOVERNMENT.

5. Finish shall conform to ASTM A792-AZ50, minimum thickness, 1.9 mils.

6. Roofing Felt: ASTM D 226 type 2, unperforated felt paper; 30 lbs./square.

7. Ridge cap: 26 gauge steel, Standard 2 piece interlocking type, formed to match roofing.

8. Metal drip edging and gable end caps shall be 28 gauge steel. Minimum dimensions shall be 3” on roof and 3” on vertical leg.

9. Fasteners and Accessories:

a. Panel and flashing fasteners shall be as specified by the roofing system manufacturer.

b. Clips and spacers shall be galvanized steel or stainless steel.

10. Felt: ASTM D226 Type I, 15 pounds/square

11. Valley flashing, gable and eave trim: 26 gauge steel. Self adhering.

12. Sheathing: If any sheathing is in poor condition it shall be replaced. Contractor shall notify CO as soon as possible if poor substrate is discovered. Existing sheathing is believed to be 5/8”. Roof sheathing shall be installed with face grain perpendicular to the framing members. No piece shall be smaller than 2 feet by 4 feet.

13. Sheathing shall be 5/8” oriented strand board or plywood on all areas not exposed to the elements. Nailing schedule shall be as per the California Building Code.

14. Sheathing on perimeter of roof where any portion may be exposed to the elements shall be 5/8” Plugged and Touch-Sanded CCX plywood.

15. Fasteners and Accessories:

a. Panel and flashing fasteners shall be as specified by the roofing system manufacturer.

b. Clips and spacers shall be galvanized steel or stainless steel.

2.02 FABRICATION

1.

Fabricate panels in continuous one- piece lengths and fabricate flashings and accessories in longest practical lengths. Flashing joints and locations shall be as shown on approved shop drawings. Additional joints shall be rejected.

2.

Roofing panels shall be factory formed. Field formed panels are not acceptable.

3. Part 3 – Quality Assurance

A. Installer's Qualifications:

1. Installer must be approved by the panel manufacturer in writing prior to work commencing.

2.

Installer shall meet the following:

a.

Successfully applied five metal roofs of comparable size and complexity which reflect a quality and weather tight installation in the region where the work will be performed.

b.

Have been in business for minimum period of 5 years in the region where the work will be performed.

B. Manufacturer's Qualifications:

1. Manufacturer shall have a minimum of 10 years experience supplying metal roofing to the region where the work is to be done.

2. Comply with current independent testing and certification as specified.

3.

Manufacturer shall provide proof of liability insurance for their metal roof system.

C. Regulatory Agency Requirements:

1. Comply with UBC and Local Building Code requirements if more than those specified herein.

2.

Certification of Compliance must be submitted with bid.

4. Part 4 – Warranty

A. Manufacturer's Product Warranty: Manufacturer's 20 year standard coating and performance warranty, as available for specified installation and environmental conditions.

B. Contractor's Warranty: Warrant panels, flashings, sealants, fasteners and accessories against defective materials and/or workmanship, to remain watertight and weatherproof with normal usage for two (2) years following Project Substantial Completion date.

5. Part 5 – EXECUTION A. Panels:

1.

Follow roof panel manufacturer's directions.

2.

Install panel seams vertically.

3.

Lap panels away from prevailing wind direction.

4.

Do not stretch or compress panel side-lap interlocks.

5.

Secure panels without warp or deflection.

6.

Fully engage battens.

7.

Remove strippable protective film, if used, immediately preceding panel installation.

B. Allowable Erection Tolerance: Maximum Alignment Variation: 1/4 inch in 40 feet.

C. Flashing:

1.

Follow manufacturer's directions and approved Shop Drawings.

2. Install integral metal flashing and sheet metal in accordance with SMACNA Architectural Sheet Metal Manual.

3.

Overlap roof panels at least 6 inches.

4.

Install flashings to allow for thermal movement.

5.

Flash all roof penetrations.

D. Cutting And Fitting:

1.

Neat, square and true. Torch cutting is prohibited.

2.

Openings 6 inches and larger in any direction:

Shop fabricate and reinforce to maintain original load capacity.

3.

Where necessary to saw-cut panels, treat with galvanic paint.

6. Part 6 - MEASUREMENT AND PAYMENT

LUMP SUM

END OF section 074113

PREFORMED METAL ROOF PANELS 074113