07420 standing seam metal roof.doc

SECTION 07420

PREFORMED METAL ROOF PANELS

PART 1

GENERAL

1.01

DESCRIPTION

A. Furnish all material, labor and equipment to complete the installation of preformed standing seam metal roof panel systems as shown on the Drawings and specified herein. Installation shall include all underlayment, metal trim, fasteners, perimeter and penetration flashing, closures, gutters and downspouts and other devices for secure anchorage of panels to substructure provided for this purpose.

B. Related work specified elsewhere:

1. Documents affecting work of this Section include, but are not necessarily limited to Architectural and Structural Notes, Details, and Plans of the attached drawings.

1.03

SUBMITTALS

A. Shop drawings: Show roofing system with flashings and accessories in plan and elevation; sections and details. Include metal thicknesses and finishes, panel lengths, joining details, anchorage details, flashings and special fabrication provisions for termination and penetrations. Indicate relationships with adjacent and interfacing work.

B. Product data: Include manufacturer’s detailed material and system description, sealant and closure installation instructions, engineering performance data and finish specifications.

C. Samples:

1. Submit sample of panel section, at least 6” x 6” showing seam profile and also a sample of color selected.

1.04

DELIVERY, STORAGE, AND HANDLING

A. Manufacturer’s responsibility:

1. Protect components during fabrication and packing from mechanical abuse, stains, discoloration, and corrosion.

2. Provide protective interleaving between contact areas of exposed surfaces to prevent abrasion during shipment, storage, and handling.

B. Installer’s responsibility:

1. Store materials off ground providing for drainage; under cover providing for air circulation; and protected from wind movement, foreign material contamination, mechanical damage, cement, lime or other corrosive substances.

2. Handle materials to prevent damage to surface, edges and ends of roofing sheets and sheet metal items. Damaged material shall be rejected and removed from the site.

3.

Protect panels from wind-related damages.

4.

Inspect materials upon delivery. Reject and remove physically damaged or marred material from project site.

1.05

JOB CONDITIONS

A. Determine that work of other trades will not hamper or conflict with necessary fabrication and storage requirements for preformed metal roofing system.

B. Protection of Roof system:

1. Provide protection or avoid traffic on completed roof surfaces.

2. Do not overload roof with stored material.

3. Do not support roof-mounted equipment directly on roofing system.

C. Ascertain that work of other trades, which penetrates the roof and is to be made watertight by approved methods, is complete prior to installation of metal roof panels.

1.06

QUALITY CRITERIA

A. Applicable Standards:

1. American Iron and Steel Institute (AISI):

a. 1986 Specification for the Design of Cold-Formed Steel Structural Members.

2. American Society for Testing and Materials (ASTM):

a. A792-86 - Specification for Steel Sheet, Aluminum-Zinc Alloy-Coated by the Hot-Dip Process.

b. B209-86 - Specification for Aluminum and Aluminum-Alloy Sheet & Plate.

c. A446-83 - Specification for Steel Sheet Zinc-coated (galvanized) by the Hot-Dip process, structural (physical) quality.

3. Sheet Metal and Air Conditioning Contractors National Association (SMACNA): 1993 Architectural Sheet Metal Manual, 5th edition.

B. Fabrication/Installer Qualifications:

1. Fabricator/Installer shall have trained supervisory personnel observing and directing work.

2. If required, fabricator/installer shall submit work experience and evidence of adequate financial responsibility. Architect reserves the right to inspect fabrication facilities in determining qualifications.

1.07

WARRANTY

A.

Provide twenty-year warranty for exterior pre-finished surfaces, covering pre-finished color coat against chipping, cracking or crazing, blistering, peeling, chalking, or fading.

PART 2

PRODUCTS

2.01

MANUFACTURERS

A.

Basis for specification: “Seam-Loc” Series Roof Panel system, as provided by MasterCraft Metals, Inc., Silver City, NM., or as approved in advance by the Government.

B.

Roof Covering System:

1.

Metal roofing shall be concealed clip, mechanically seamed panels, roll formed in continuous lengths.

2.

Rib Height shall be 1-1/2”, with a nominal panel width of 20”.

3.

The panel substrate shall be of a 24 gauge “Galvalume” or G-90 galvanized steel.

4.

Panel finish shall be a full strength 70% Kynar 500 or Hylar 5000 resin system.

5.

Roof slopes less than 1” in 12” shall require butyl sealant in the panel seam and an underlayment of high temperature, self-adhering ice and water barrier.

6.

Panels shall conform to ASTME 1592 or UL 90 specifications.

C. Sheet Steel Stock: ASTM A446, Grade A; zinc-coated to ASTM A525, designation; pre-finished, color selected from manufacturer’s standard range of colors. Color shall be selected and approved by the COR.

D. Joint Seal Gaskets: Manufacturer’s standard as required.

E. Fasteners: Manufacturer’s standard type, galvanized to ASTM A386, finish to match adjacent surfaces when exposed.

F. Provide all miscellaneous accessories for complete installation.

G. Sealant: Manufacturer’s standard non-staining, elastomeric, skinning.

H. Soffit shall use same material as for roofs or equivalent materials approved by Government.

a . Provide soffit vent as indicated on Drawings

2.02

ACCESSORY PRODUCTS

A. Sealant:

1. Acceptable product: As specified in manufacturer’s written instructions for Concealed and Exposed applications.

2. Colors: As selected by Architect from sealant manufacturer’s standard selection.

B. Underlayment:

Sharkskin Ultra SA

Kirsch Building Products, LLC

1464 Madera Rd Suite No. 387

Simi Valley, CA 93065

877-742-7507

Or approved equal.

2.03

FABRICATION

A. Shop fabricate metal panels and flashing components to the maximum extent possible, forming metal work with clear, sharp, straight, and uniform bends and rises. Hem exposed edges of flashings.

B. Form flashing components from full single width sheet in minimum 10’-0” sections. Provide shop fabricated, mitered corners, joined using closed end pop rivets and joint sealant.

C. Fabricate metal panels and related sheet metal work in accordance with approved shop drawings and applicable standards.

PART 3

EXECUTION

3.01

PREPARATION

A. Inspection: Examine the alignment and placement of the building structure and substrate. Correct any objectionable warp, waves or buckles in the substrate before proceeding with installation of the preformed metal roofing.

3.02

METAL ROOF PANEL SYSTEM INSTALLATION

A. Install metal panel system and flashings in accordance with approved shop drawings and manufacturer’s product data.

B. Isolate dissimilar metals and masonry or concrete from metals with bituminous coating. Use gasketed fasteners where required to prevent corrosive action between fastener, substrate, and panels.

C. Seal laps and joints in accordance with metal panel system manufacturer’s product data.

D. Coordinate flashing and sheet metal work to provide weathertight conditions at all penetrations and terminations.

1. Fabricate and install in accordance with standards of SMACNA Manual.

2. Provide for temperature expansion/contraction movement of panels at all penetrations and surface mounted equipment in accordance with system manufacturer’s product data and design calculations.

E. Remove damaged work and replace with new, undamaged components.

F. Touch up exposed panel surface finish using paint furnished by metal panel manufacturer and matching exposed metal panel surface finish.

G. Clean exposed surfaces of metal panels and accessories after completion of installation. Leave in clean condition at date of substantial completion. Touch up minor abrasions and scratches in finish.

3.03

FLASHING AND TRIM

A. Supply at rakes, including peak and corner assemblies, high and low eaves, corners bases, framed openings, and edge of fascia and as required to provide for weather tightness and finished appearance.

3.04

SOFFIT PANELS

A. As specified in 2.01 above or as called for on drawings.

3.05

GUTTER AND DOWNSPOUT FABRICATION

A. Fabricate of same material and finish as roof metal.

1. Form gutters and downspouts of 26-Ga. and size to collect and remove water. Fabricate with connection pieces.

2. Form section in maximum possible lengths. Hem exposed edges. Allow for expansion at joints.

A. Fabricate support straps of same material and finish as roofing metal, color as selected.

3.06

COLORS

B. As selected by Owner's representative. (Maximum of two colors, plus third color for trim.)

END OF SECTION

PREFORMED METAL ROOF PANELS

07420-4