GUIDE SPECIFICATION GARCO “GML”
STANDING SEAM ROOFING
SECTION 07610

Garco “GML” Guide Specifications

This Guide Specification is intended to be used as a basis for the development of an office master specification or in the preparation of specifications for a particular project. In either case, this Guide Specification must be edited to fit the conditions of use. Particular attention should be given to the deletion of inapplicable provisions. Include necessary items related to a particular project. Include appropriate requirements where blank spaces have been provided.

Section 07610 - Preformed Metal Standing Seam Roofing

PART 1 - GENERAL

1.01 SECTION INCLUDES
The work includes, but is not necessarily limited to, furnishing and installation of all preformed metal roofing, and accessories as indicated on the drawings and specified herein.

1.02 RELATED SECTIONS

Edit for project conditions. Section numbers indicated are those recommended by CSI Masterformat; revise if numbers differ from those used in Project Manual.

A. Metal Deck Used as Concrete Formwork: Section 03100
B. Structural Steel Supports: Section 05100
C. Structural Metal Roof and Floor Decking: Section 05300
D. Miscellaneous Fabricated Steel: Section 05500
E. Structural Lumber Supports: Section 06100
F. Structural Glue Laminated Lumber Supports: Section 06181
G. Thermal Insulation: Section 07200
H. Fireproofing: Section 07250
I. Sheetmetal Gutters and Downspouts: Section 07600
J. Joint Sealants not Specified Herein: Section 07900
K. Finish Painting not Specified Herein: Section 09900

1.04 SUBMITTALS
A. SAMPLES AND LITERATURE
1. Prior to ordering products, submit samples of roof panels and concealed clips along with manufacturer's literature and specifications.
B. DETAIL DRAWINGS
1. Detailed shop drawings must be submitted for approval prior to fabrication Shop drawings shall indicate the factory coating specifications and other data as necessary to clearly describe gauges, profiles, fastener types and locations.

1.05 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 a 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. Manufacturer shall provide proof of liability insurance for their metal roof system and comply with current independent testing and certification as specified.
3. Prior to bid, manufacturer shall submit product sample, literature and project reference list for architect approval.
C. REGULATORY AGENCY REQUIREMENTS
1. Comply with IBC, UBC and local building code requirements if more than those specified herein.
2. Compliance with certification must be submitted with bid.

1.06 PRODUCT DELIVERY, STORAGE AND HANDLING
A. Comply with manufacturer's recommendations for off-loading materials.
B. Handle panels with non-marring slings.
C. Do not bend panels.
D. Store panels above ground, with one end elevated for drainage.
E. Protect panels against standing water and condensation between adjacent surfaces.
F. If panels become wet, immediately separate sheets, wipe dry with clean cloth, and allow to air dry.
G. Store accessory items in a dry place.

1.07 PROJECT CONDITIONS
A. Examine the conditions and substrates in which metal roofing work is to be installed. Substrate shall be installed level, flat and true to avoid panel stresses.
B. Field measurements shall be taken prior to fabrication of panels.
C. Proceed with roofing installation only after satisfactory conditions are met.

1.08 WARRANTY
A. MANUFACTURER'S PRODUCT WARRANTY
1. Manufacturer's standard performance warranty, as available for specified installation and environmental conditions. (Contact a Garco Building Systems representative to determine actual warranty criteria).
B. CONTRACTOR'S WARRANTY
1. 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.

PART 2 - PRODUCTS

2.01 ACCEPTABLE MANUFACTURER
A. IMSA Steel Building Products USA, Inc., 2110 Enterprise Boulevard, West Sacramento, CA 95691-3493, 800-726-2727, Garco Building Systems, 2714 S. Garfield, Spokane, WA 99224-9595.
B. Panel Designation: Garco “GML” Standing Seam
C. ALTERNATES: Approval of substitute systems is required prior to bid. The architect will be the sole judge of what qualifies as an “equal” system. To be approved as an equal system, submit or respond to all items in “Quality Assurance”, “Performance Requirements” and “Submittal” sections of this specification. All submittals must be received in the architect's office a minimum of ten (10) working days prior to bid.

2.02 MATERIALS
A. PANELS
1. Base Metal:
a. Material: Steel conforming to ASTM A-924 Grade D with a minimum yield strength of 50,000 psi and thickness not less than 24 gauge.
b. Protective Coating: Zincalume® conforming to ASTM A-792 AZ50, 45% zinc and 55% aluminum alloy by weight.

Note: A variety of paint finishes are available on a custom basis including Polyester, Silicone-Modified (SMP) and Polyvinylidene Fluoride (PVF2). Contact your Garco Building SYstems representative for information on performance, cost and availability.

2. Configuration:
a. Profile: Roof panels shall consist of a 19” wide pan between 3”; high corrugations with factory-caulked standing seams for a 24” net coverage in place. Corrugations shall be haunched to provide a reinforcing rib on each side. Panels shall be factory-notched and punched.
b. Provide panels in the maximum length recommended by Garco Building Systems to minimize endlaps and still accommodate practical transportation and field handling.

Note: All flat metal surfaces can display waviness commonly referred to as “oil canning” to a greater extent than lighter, more neutral colors. Darker colors will accentuate “oil canning” to a greater extent than lighter, more neutral colors. Oil canning is an inherent characteristic of flat steel products, not a defect, and therefore is not a cause for panel rejection.

B. ACCESSORIES
1. Concealed Clip:
2 piece movable clip with a fixed base of 0.060” thick galvanized steel with a factory-caulked and self-centered sliding top of 0.031” thick heat treated steel, allowing for 21/8” of thermal movement.
2. Fasteners:
a. Concealed Fasteners: Plated steel as recommended by panel manufacturer.
b. Exposed Fasteners: Long life zinc and aluminum alloy cast head with self-sealing washers, such as ZACTM.
c. Back-up Plate Fastener: #14 x 11/4” zinc and aluminum alloy cast head, long-life fastener, such as ZACTM, AB point self-tapping fastener with a 3/8” hex washer head and self-sealing washer.
3. Sealant:
a. Factory-applied sidelap seam sealant.
b. Field-Applied Tape Sealant: Butyl type, 1/8” x 11/2”.
4. Connection Hardware:
Shall be designed to allow the roof system including panels, flashings, endlaps, rake and ridge conditions to move with thermal expansion/contraction from a fixed eave condition.
a. Rake Support: 17 gauge galvanized or zinc-aluminum coated steel.
b. Back-Up Plate: 16 gauge galvanized or zinc-aluminum coated steel. Factory punched so that back-up plate fasteners apply 2,000 pounds clamping force at endlaps.
c. End Dam: 24 gauge galvanized or zinc-aluminum coated steel. Factory punched.
d. Cinch Strap: 18 gauge stainless steel prepunched and shaped to fit tightly up to one complete rib/seam and one flat area. Strap shall compress the panel tightly inside radii of the corrugation and in the flat.
5. Thermal Blocks: Thickness as required 1.0 pcf expanded polystyrene foam.
C. FLASHING
1. Flashings, gutters and downspouts shall be of 26 or 24 gauge Zincalume® or prepainted galvanized coated steel to provide a complete, weathertight installation.

PART 3 - EXECUTION

3.01 EXAMINATION
A. Garco “GML” Standing Seam panels shall be installed only when the substrate and/or subframe is installed and aligned true in plane, accurate and, secured in place.

3.02 PREPARATION
A. FIELD MEASUREMENTS
1. Verify prior to fabrication.
2. If field measurements differ from drawing dimensions, notify architect/engineer prior to fabrication.
B. PROTECTION
1. Treat, or isolate with protective material, any contacting surfaces of dissimilar materials to prevent electrolytic corrosion.
2. Require workers who will be walking on roofing panels to wear clean, soft-soled work shoes that will not pickup up stones or other abrasive material which could cause damage and discoloration.
3. Protect work of other trades against damage and discoloration.
C. SURFACE PREPARATION
1. Clean and dry surfaces prior to applying sealant.

3.03 INSTALLATION
A. PANELS
1. Install per approved submittal drawings and manufacturer's installation procedures.
2. Panel-to-panel connections (choose one connection method from below):
• Positive, self-locking standing seam, crimped at clips and ends.
• Mechanical field seam, using manufacturer's seaming tool.
3. All side lap and clip caulking shall be factory-injected.
4. Remove any strippable film coating prior to installation and in any case, do not allow the strippable film coating to remain on the panels in extreme heat, cold or in direct sunlight or other UV source.
B. ALLOWABLE ERECTION TOLERANCE
1. Maximum Alignment Variation: 1/4 inch in 40 ft.
C. FLASHING
1. The panels shall be fixed at the eave. The ridge and rake assemblies shall be designed to allow the roof panels to move lengthwise with expansion/contraction for temperature changes up to a minimum of 150° F. Panel end laps shall not be attached to the substructure to allow for thermal movement.
2. Discrepancies between job site conditions and drawings as approved shall be brought to the attention of the architect or architect's representative.
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, deburr and treat with galvanic paint.

3.04 CLEAN UP AND CLOSE OUT
A. PANEL DAMAGE AND FINISH SCRATCHES
1. Do not apply touch-up paint to damaged paint areas that involve minor scratches.
2. Panels or flashings that have severe paint and/or substrate damage shall be replaced as directed by the architect's or owner's representative.

Note: Garco Building Systems does not recommend touch-up painting of damaged surfaces (minor scratches, etc.) due to fading and weathering differences of the touch-up paints in comparison to factory applied paint system.

B. CLEANING AND REPAIRING
1. At completion of each day's work and at work completion, sweep panels, flashings and gutters clean. Do not allow fasteners, cuttings, fillings or scraps to accumulate.
2. Remove debris from project site upon work completion or sooner, if desired.

END OF SECTION