07 71 23 - Manufactured Gutters and Downspouts.pdf

07 71 23 – MANUFACTURED GUTTERS AND DOWNSPOUTS

Herbert, Rowland & Grubic, Inc. 07 71 23 - 1 000483.0450

SECTION 07 71 23 – MANUFACTURED GUTTERS AND DOWNSPOUTS

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Gutters and downspouts.

1.2 DEFINITIONS

A. PVDF: Polyvinylidene fluoride.

1.3 REFERENCE STANDARDS

A. American Architectural Manufacturers Association:

1. AAMA 611 - Voluntary Specification for Anodized Architectural Aluminum.

2. AAMA 2603 - Voluntary Specification, Performance Requirements and Test

Procedures for Pigmented Organic Coatings on Aluminum Extrusions and Panels.

3. AAMA 2604 - Voluntary Specification, Performance Requirements and Test

Procedures for High Performance Organic Coatings on Aluminum Extrusions and Panels.

4. AAMA 2605 - Voluntary Specification, Performance Requirements and Test Procedures for Superior Performing Organic Coatings on Aluminum Extrusions and Panels.

B. ASTM International:

1. ASTM A653/A653M - Standard Specification for Steel Sheet, Zinc-Coated

(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process.

C. National Roofing Contractors Association:

1. NRCA - The NRCA Roofing Manual.

D. Sheet Metal and Air Conditioning Contractors:

1. SMACNA - Architectural Sheet Metal Manual.

1.4 COORDINATION

A. Section 01 31 13 – Project Coordination: Requirements for coordination.

B. Coordinate Work of this Section with roof edge construction.

C. Coordinate with roof membrane warranty requirements.

1.5 SUBMITTALS

A. Section 01 33 00 – Submittal Procedures: Requirements for submittals.

B. Product Data: Submit manufacturer information regarding components, materials, and

Herbert, Rowland & Grubic, Inc. 07 71 23 - 2 000483.0450 finishes.

C. Shop Drawings: Indicate locations, configurations, jointing methods, fastening methods, locations, and installation details.

1.6 QUALITY ASSURANCE

A. Perform Work according to NRCA Roofing Manual.

B. Installer shall have a minimum of 3 years of experience in fabricating and installing similar sheet metal systems.

1.7 DELIVERY, STORAGE, AND HANDLING

A. Section 01 61 00 – Product Requirements: Requirements for transporting, handling, storing, and protecting products.

B. Inspection: Accept materials on Site in manufacturer's original packaging and inspect for damage.

C. Storage:

1. Store materials according to manufacturer instructions.

2. Prevent contact with materials capable of causing discoloration, staining, or damage.

3. Slope to drain.

D. Protection:

1. Protect materials from moisture and dust by storing in clean, dry location remote from construction operations areas.

2. Stack material to prevent twisting, bending, and abrasion, and to provide ventilation.

3. Provide additional protection according to manufacturer instructions.

1.8 EXISTING CONDITIONS

A. Field Measurements:

1. Verify field measurements prior to fabrication.

PART 2 - PRODUCTS

2.1 PERFORMANCE AND DESIGN CRITERIA

A. Sizing: Comply with NRCA Roofing Manual for sizing components based on rainfall intensity determined by storm occurrence of once in 100 years.

2.2 GUTTERS AND DOWNSPOUTS

A. Description:

1. Gutters:

Herbert, Rowland & Grubic, Inc. 07 71 23 - 3 000483.0450

a. Material: Sheet metal.

b. Profile: NRCA; rectangular or square.

2. Downspouts:

a. Material: Same metal type as gutters.

b. Profile: NRCA; rectangular or square.

2.3 MATERIALS

A. Prefinished Galvanized-Steel Sheet:

1. Comply with ASTM A653/A653M; G90 zinc coating.

2. Core Steel Thickness: 24 gage.

3. Shop Precoat: Silicone-modified polyester or PVDF.

4. Color: As selected by Owner.

2.4 FABRICATION

A. Forming of Sections:

1. Description:

a. Square and accurate in size.

b. Maximum possible lengths.

c. Free of distortion or defects detrimental to appearance or performance.

2. Shapes: As indicated on Drawings.

B. Fabricate with required connection pieces.

C. Hem exposed edges of metal.

D. Polyester Coating:

1. Description: Baked-enamel system.

2. Material: Modified silicone.

3. Comply with AAMA 2603.

OR

E. PVDF Coating:

1. Description: Multiple-coat, thermally cured, fluoropolymer system.

2. Comply with AAMA 2604.

F. Primer Coat: Finish concealed side of metal sheets with primer compatible with finish system, as recommended by finish system manufacturer.

G. Site Finishing: As specified in Section 09 91 00 – Painting.

2.5 ACCESSORIES

A. Anchors and Supports:

1. Profile: To suit gutters and downspouts.

2. Anchoring Devices: Type as recommended by manufacturer.

3. Supports:

Herbert, Rowland & Grubic, Inc. 07 71 23 - 4 000483.0450

a. Gutters: Furnish brackets, straps.

b. Downspouts: Furnish brackets and straps.

B. Fasteners: Same material and finish as gutters and downspouts.

C. Primer Type: Zinc molybdate or manufacturer recommended coating when in contact with dissimilar metals.

D. Protective Backing Paint: Zinc-molybdate alkyd or manufacturer recommended coating when in contact with dissimilar metals.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Section 01 73 00 – Execution Requirements: Requirements for installation examination.

B. Verify that surfaces are ready to receive gutters and downspouts.

3.2 PREPARATION

A. Section 01 73 00 – Execution Requirements: Requirements for installation preparation.

B. Paint concealed metal surfaces and surfaces in contact with dissimilar metals using protective backing paint to minimum dry film thickness of 15 mils.

3.3 INSTALLATION

A. Sheet Metal:

1. Join lengths with formed seams, watertight.

2. Flash and seal gutters to downspouts and accessories.

B. Minimum Gutter Slope: 1/4 inch per 10 foot.

C. Set splash pads under downspouts, and secure in place.

END OF SECTION 07 71 23