B09_Attachment_32_-_06_20_13_-_Exterior_Finish_Carpentry_0007.pdf

HAVO – 305150B 06 20 13- 1

081224 EXTERIOR FINISH CARPENTRY

SECTION 06 20 13 – EXTERIOR FINISH CARPENTRY

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Siding

2. Trims, casings and similar finish items

1.2 SUBMITTALS

A. Product data

1. Lumber

2. Softwood Plywood

3. Cement board

4. Fasteners

5. Sound absorbing panels

1.3 DELIVERY, STORAGE, AND HANDLING

A. Stack lumber, plywood, and other panels flat with spacers between each bundle to provide air circulation.

1. Protect materials from weather by covering with waterproof sheeting, securely anchored.

2. Provide for air circulation around stacks and under coverings.

1.4 PROJECT CONDITIONS

A. Weather Limitations: Proceed with installation only when existing and forecast weather conditions permit work to be performed and at least one coat of specified finish can be applied without exposure to rain, snow, or dampness.

B. Do not install finish carpentry materials that are wet, moisture damaged, or mold damaged.

1. Indications that materials are wet or moisture-damaged include, but are not limited to, discoloration, sagging, or irregular shape.

2. Indications that materials are mold damaged include, but are not limited to, fuzzy or splotchy surface contamination and discoloration.

PART 2 - PRODUCTS

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2.1 MATERIALS

A. Lumber: DOC PS 20 and applicable rules of grading agencies indicated. If no grading agency is indicated, comply with applicable rules of any rules-writing agency certified by the American Lumber Standard Committee's (ALSC) Board of Review. Grade lumber by an agency certified by the ALSC's Board of Review to inspect and grade lumber under the rules indicated.

1. Factory mark each piece of lumber with grade stamp of inspection agency, indicating grade, species, moisture content at time of surfacing, and mill.

2. All decking and railing components shall be smooth surfaced on four sides.

B. Softwood Plywood: DOC PS 1.

C. Cement board: ANSI

D. Fasteners: All fasteners shall be stainless steel, Type 304.

E. Sound absorbing panels: 100% polyester panels approximately ½-inch thick, charcoal color.

Minimum NRC rating: 0.45

2.2 FABRICATION

A. Back out or kerf backs of standing and running trim wider than 5 inches, except members with ends exposed in finished work.

B. Ease edges of lumber less than 1 inch in nominal thickness to 1/16-inch radius and edges of lumber 1 inch or more in nominal thickness to 1/8-inch radius.

PART 3 - EXECUTION

3.1 EXAMINATION

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

B. Examine finish carpentry materials before installation. Reject materials that are wet, moisture damaged, and mold damaged.

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

3.2 PREPARATION

A. Clean substrates of projections and substances detrimental to application.

B. Prime lumber and moldings to be painted, including both faces and edges, unless factory primed.

1. Cut to required lengths and prime ends.

2. Comply with requirements in Section 099113 "Exterior Painting."

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3.3 INSTALLATION

A. General

1. Do not use materials that are unsound, warped, improperly treated or finished, inadequately seasoned, or too small to fabricate with proper jointing arrangements.

a. Do not use manufactured units with defective surfaces, sizes, or patterns.

2. Install exterior finish carpentry level, plumb, true, and aligned with adjacent materials.

a. Use concealed shims where necessary for alignment.

b. Scribe and cut exterior finish carpentry to fit adjoining work.

c. Refinish and seal cuts as recommended by manufacturer.

d. Install to tolerance of 1/8 inch in 96 inches for level and plumb. Install adjoining exterior finish carpentry with 1/32-inch maximum offset for flush installation and 1/16-inch maximum offset for reveal installation.

e. Coordinate exterior finish carpentry with materials and systems in or adjacent to it.

B. Standing and Running Trim

1. Install flat-grain lumber with bark side exposed to weather.

2. Install trim with minimum number of joints as is practical, using full-length pieces from maximum lengths of lumber available. Do not use pieces less than 24 inches long, except where necessary.

a. Use scarf joints for end-to-end joints.

b. Stagger end joints in adjacent and related members.

3. Fit exterior joints to exclude water.

a. Cope at returns and miter at corners to produce tight-fitting joints, with full- surface contact throughout length of joint.

b. Plane backs of casings to provide uniform thickness across joints, where necessary for alignment.

4. Where face fastening is unavoidable, countersink fasteners, fill surface flush, and sand unless otherwise indicated.

3.4 ADJUSTING

A. Replace exterior finish carpentry that is damaged or does not comply with requirements.

1. Exterior finish carpentry may be repaired or refinished if work complies with requirements and shows no evidence of repair or refinishing.

B. Adjust joinery for uniform appearance.

3.5 CLEANING

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A. Clean exterior finish carpentry on exposed and semi-exposed surfaces.

B. Touch up factory-applied finishes to restore damaged or soiled areas.

3.6 PROTECTION

A. Protect installed products from damage from weather and other causes during construction.

B. Remove and replace finish carpentry materials that are wet, moisture damaged, and mold damaged.

1. Indications that materials are wet or moisture-damaged include, but are not limited to, discoloration, sagging, or irregular shape.

2. Indications that materials are mold damaged include, but are not limited to, fuzzy or splotchy surface contamination and discoloration.

END OF SECTION 06 20 13

4. Where face fastening is unavoidable, countersink fasteners, fill surface flush, and sand unless otherwise indicated.

B. Adjust joinery for uniform appearance.