Amend_1_Exhibit_I_-_08_90_00-Louvers_and_Vents_Addenda_Exhibit.pdf

Little Tujunga Barracks Renovation DIVISION 8 Section 08 90 00 -1 Angeles National Forest

SECTION 08 90 00

LOUVERS & VENTS

PART 1 - GENERAL

1.1 SUMMARY

A. Drawings and general provisions of the Contract, including General Conditions and Division 01 Specification Sections, apply to this Section.

B. Section Includes:

1. Fixed, extruded-aluminum architectural louvers to replace (E) wood sidewall louvers. Locations and size as indicated on the Drawings.

2. Attic vents to be installed within existing composition shingle roofing. Selective removal of existing roofing system and sheathing; re-installation of roofing to match existing.

3. Refer to Mechanical Drawings for additional louver requirements.

C. Related Sections:

1. Division 07 Section "Sheet Metal Flashing and Trim" for sheet metal flashing.

2. Division 07 Section “”Fiber Cement Siding and Trim” for replacing existing wood vents with new aluminum vents at sidewalls.

3. Division 07 Section “Joint Sealants” for sealants installed in perimeter joints between louver frames and adjoining construction.

4. Division 23 Sections for ductwork connections to louvers, and louvers and registers that are a part of mechanical equipment.

1.2 DEFINITIONS

A. Louver Terminology: Definitions of terms for metal louvers contained in AMCA 501 apply to this Section unless otherwise defined in this Section or in referenced standards.

1.3 REFERENCED STANDARDS

A. Air Movement and Control Association International, Inc.

1. AMCA 500-L-99 Test Methods for Louvers, Dampers

2. AMCA 501-93 Application Manual for Air Louvers

B. American Architectural Manufacturers Association

1. AAMA 800 Voluntary Specifications and Test Methods for Sealants 2.

3. AAMA 2605-98 Voluntary Specification, Performance Requirements and Test

Procedures for Superior Performing Organic Coatings on Aluminum Extrusions and Panels

C. American Society for Testing and Materials

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1. ASTM B 209-96 Specification for Aluminum and Aluminum-Alloy Sheet and Plate

2. ASTM B 221-96 Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles and Tubes

3. ASTM D 1187-97 Specification for Asphalt-Base Emulsions for Use as Protective Coatings for Metal

D. American Society of Civil Engineers

1. ASCE 7-98: Minimum Design Loads for Buildings and Other Structures

E. American Welding Society

1. AWS D1.2-97: Structural Welding Code--Aluminum

F. National Association of Architectural Metal Manufacturers

1. Metal Finishes Manual for Architectural and Metal Products. 1988.

G. Sheet Metal and Air Conditioning Contractors' National Association

1. Architectural Sheet Metal Manual. 7TH Edition, 2012.

1.4 SUBMITTALS

A. General: Submit in conformance with General Requirements Section 01 33 00, “Submittals”.

B. Product Data: For each type of product indicated. For louvers specified to bear AMCA seal, include printed catalog pages showing specified models with appropriate AMCA Certified Ratings Seals.

C. Shop Drawings: For louvers and accessories.

1. Include plans, elevations, sections, details, and attachments to other Work.

2. Show blade profiles, angles, and spacing.

D. Samples for Verification: For each type of metal finish required.

E. Product Test Reports: Based on evaluation of comprehensive tests performed by a qualified testing agency or by manufacturer and witnessed by a qualified testing agency, for each type of louver.

1.5 QUALITY ASSURANCE

A. Source Limitations: Obtain louvers through one source from a single manufacturer where indicated to be of same type, design, or factory-applied color finish.

B. Welding: Qualify procedures and personnel according to the following: AWS D1.2, "Structural Welding Code--Aluminum."

C. SMACNA Standard: Comply with recommendations in SMACNA's "Architectural Sheet Metal Manual" for fabrication, construction details, and installation procedures.

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PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Acceptable Manufacturers:

1. Products named or identified by make or model number, or other designation and described below are base products. Base products establish the standards of type, function, dimension, in-service performance, physical properties, appearance, warranty, cost, and other characteristics required by the Project.

2. If “No substitutions” is indicated next to the product name, provide only products of listed manufacturers.

3. Subject to the requirements of Division 1 Section “Product Requirements”, products of manufacturers not listed may be proposed for substitution, provided that they are comparable to the products specified.

4. The burden of proof of equality of proposed products is on the Contractor:

B. Sidwall Louvers

1. Inverted Y, non-vision louver (AFDL) as manufactured by Greenheck • PO Box

410 • Schofield, WI 54476 • 715.359.6171

2. Model No.:

a. Stationary Louver: K Blade, ESK-402 with bird screen

b. Finish: Kynar finish to match window frames

c. Features: provide with nailing flange frame and sill extension.

C. Fasteners: Of same basic metal and alloy as fastened metal or 300 Series stainless steel, unless otherwise indicated.

1. Do not use metals that are incompatible with joined materials.

2. Use types and sizes to suit unit installation conditions.

3. Use Phillips flat-head screws for exposed fasteners, unless otherwise indicated.

D. Attic Vents

1. Low Profile Attic Vent as manufactured by Award Metals, 1450 Virginia

Avenue, Baldwin Park, CA 91706 (626) 814-4410

2. Model No.:

a. 48” long - “Stealth”; ICC Evalation No. ER-5463

b. Finish: Paint Ready Aluminum Zinc, field paint finish coats to blend with existing roofing.

E. Bituminous Paint: Cold-applied asphalt emulsion complying with ASTM D 1187.

2.2 FABRICATION, GENERAL

A. Assemble louvers in factory to minimize field splicing and assembly.

1. Disassemble units as necessary for shipping and handling limitations.

2. Clearly mark units for reassembly and coordinated installation.

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B. Maintain equal louver blade spacing, including separation between blades and frames at head and sill, to produce uniform appearance. Maintain equal louver blade spacing to produce uniform appearance.

C. Fabricate frames to fit in openings of sizes indicated, with allowances made for fabrication and installation tolerances, adjoining material tolerances, and perimeter sealant joints.

D. Include supports, anchorages, and accessories required for complete assembly.

E. Join frame members to each other and to fixed louver blades with fillet welds, threaded fasteners, or both, as standard with louver manufacturer, concealed from view, unless otherwise indicated or size of louver assembly makes bolted connections between frame members necessary.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates and openings, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance.

1. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 PREPARATION

A. Coordinate setting drawings, diagrams, templates, instructions, and directions for installation of louvers are to be installed in doors. Coordinate delivery of such items to Project site.

3.3 INSTALLATION

A. Vertical Wall Louvers

1. Locate and place louvers level, plumb, and at indicated alignment with adjacent work.

2. Use concealed anchorages where possible. Provide brass or lead washers fitted to screws where required to protect metal surfaces and to make a weathertight connection.

3. Form closely fitted joints with exposed connections accurately located and secured.

Provide perimeter reveals and openings of uniform width for sealants and joint fillers, as indicated.

4. Repair finishes damaged by cutting, welding, soldering, and grinding.

a. Restore finishes so no evidence remains of corrective work.

b. Return items that cannot be refinished in the field to the factory, make required alterations, and refinish entire unit or provide new units.

5. Install concealed gaskets, flashings, joint fillers, and insulation as louver installation progresses, where weathertight louver joints are required. Comply with Division 07 Section “Joint Sealants” for sealants applied during louver installation.

B. Attic Vents

1. Locate and place vents as indicated on roof plan.

2. Remove existing roofing only to extent necessary to cut away sheathing at vent locations, install vent

Little Tujunga Barracks Renovation DIVISION 8 Section 08 90 00 -5

3. Re-install roofing system to match existing to create a weather tight barrier.

3.4 ADJUSTING AND CLEANING

A. Clean exposed surfaces of louvers that are not protected by temporary covering, to remove fingerprints and soil during construction period. Do not let soil accumulate until final cleaning.

B. Before final inspection, clean exposed surfaces with water and a mild soap or detergent not harmful to finishes. Thoroughly rinse surfaces and dry.

C. Restore louvers damaged during installation and construction so no evidence remains of corrective work. If results of restoration are unsuccessful, as determined by Engineer, remove damaged units and replace with new units.

D. Touch up minor abrasions in finishes with air-dried coating that matches color and gloss of, and is compatible with, factory-applied finish coating.

END OF SECTION 08 90 00