06_01_40_Repair_and_Restoration_of_Arch.pdf

06 01 40 - 1 Repair and Restoration of Architectural Woodwork

GENEVA OFFICE BUILDING EXTERIOR IMPROVEMENTS

SECTION 06 01 40

REPAIR AND

RESTORATION OF

ARCHITECTURAL

WOODWORK

PART 1 - GENERAL

1.01 SECTION INCLUDES

A. Fabrication and installation of new, custom double-hung window.

B. In-kind replacement of significantly damaged or deteriorated woodwork component.

C. In-kind replacement of missing woodwork component.

D. Repair of cracks, checks, spalls, losses, and deteriorated wood using wood dutchman or epoxy wood filler.

1.02 DEFINITIONS

A. Wood Window Component Terminology: As identified in WI's "Architectural Woodwork

Standards." Wood window components for historic treatment work include following classifications:

1. Sash Components: Rails, stiles, muntins, ogee lugs, parting beads, and stops.

2. Frame Components: Head, jamb, and sill.

3. Exterior Trim: Exterior casing, brick mould, parge coat, and drip cap.

4. Interior Trim: Casing, stool, and apron.

B. Window: Includes sash, frame, glazing, and hardware.

C. Glazing: Includes glass, glazing points, glazing tapes, glazing sealants, and glazing putty.

1.03 RELATED REQUIREMENTS

A. Section 09 90 00 - Painting and Coating

1.04 REFERENCE STANDARDS

A. Woodwork Institute's Architectural Woodwork Standards, current edition.

1.05 ADMINISTRATIVE REQUIREMENTS

A. Coordination: Contractor shall coordinate Work of this Section with other trades involved in restoration work, including but not limited to, painting and coating.

1.06 SUBMITTALS

A. Product Data:

1. General: Submit following information for each type of product indicated, including finish materials and processes.

a. Recommendations for application and use.

b. Instructions for storage and handling.

c. Manufacturer's specifications and test data, Safety Data Sheets, and certifications sustaining that products comply with requirements.

d. If proposal of substitutions is allowed under submittal procedures, explanation of all substitutions proposed.

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B. Samples:

1. Submit minimum half-foot length samples of new wood to be used for component replacement and dutchman repair.

a. Include product data and/or chain-of-custody certificates for products containing certified wood.

C. Shop Drawings:

1. For New Windows:

a. Include plan, elevations, sections, hardware, accessories, operational clearances, and installation details, including anchor, flashing, and sealant installation.

b. Include construction details, material descriptions, glazing and fabrication methods, dimensions of individual components and profiles, hardware, and finishes for wood windows.

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1.07 QUALITY ASSURANCE

A. Contractor to perform Work shall have not less than 7 years successful experience in comparable architectural woodwork repair and restoration projects on historic landmark-quality buildings. Firm shall have expertise in all Work of this Section and shall employ personnel and supervisors skilled in repair and restoration processes and operations indicated. They shall demonstrate working knowledge of The Secretary of the Interior's Standards for the Treatment of Historic Properties with Guidelines for Preserving, Rehabilitating, Restoring & Reconstructing Historic Buildings.

B. Window Sash Manufacturer Qualifications: Company specializing in manufacturing custom wood windows and louvers, with not less than 5 years of documented experience.

C. Source Limitations for Materials:

1. Obtain primary wood repair materials from single manufacturer. Provide secondary materials as recommended by manufacturer of primary materials.

1.08 REGULATORY REQUIREMENTS

A. Comply with all local, state and federal requirements regarding use of wood repair materials that contain chemicals considered hazardous by authorities having jurisdiction.

1.09 DELIVERY, STORAGE, AND HANDLING

A. Deliver manufactured products to job site in their original, unopened containers and packaging with all labels intact and legible at time of use. Delivered materials shall be identical to approved samples.

B. Store packaged materials in clean, dry, well-ventilated areas, away from heat, sparks, flame, direct rays of sun, and intrusion of foreign matter secure area acceptable to Architect. Store materials on raised platforms and under ventilated, waterproof cover. Maintain storage areas free from fire hazard.

C. Protect wood elements during transit, delivery, storage, and handling to prevent damage, soiling, and deterioration. Protect materials against weather and contact with damp or wet surfaces. Stack lumber, plywood, and other panels. Provide for air circulation within and around stacks and under temporary coverings.

D. Immediately re-seal containers after partial use.

E. Replacements: In event of damage, Contractor shall immediately make all repairs and replacements necessary, at no cost to Owner.

1.10 FIELD CONDITIONS

A. Perform work only when temperature of products being used, temperatures of existing and new materials, and air temperature and humidity comply with manufacturer's written requirements and requirements of this Section. In case of conflict, most stringent requirements shall govern.

1. Do not proceed with wood epoxy applications until substrate moisture content is within range specified by epoxy manufacturer.

B. 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.

C. 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.

D. Cover partially completed work when work is not in progress.

1.11 WARRANTY

A. New Window: Provide manufacturer's warranty for 2 years.

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PART 2 PRODUCTS

2.01 REPLACEMENT WOOD MATERIALS

A. Quality Standard: Unless otherwise indicated, comply with Woodwork Institute's Architectural Woodwork Standards for grades, finishes, installation, and other requirements.

B. Wood:

1. Certified, clear fine-grained lumber; kiln dried to moisture content of 6 to 12 percent at time of fabrication; free of visible finger joints, blue stain, knots, pitch pockets, and surface checks larger than 1/32 inch deep by 2 inches wide. Wood to be obtained from forests certified by FSC-accredited certification body to comply with FSC STD-01-001, "FSC Principles and Criteria for Forest Stewardship."

2. Wood for dutchman repair and component replacement shall match existing element being repaired or replaced in grade, grain, and cut. Species shall match exisitng or be an approved alternate species with comparable characteristics to the historic wood.

3. Wood for replacement frames, sash, and components to be Douglas Fir or species to match existing.

C. Fabrication:

1. Fabricate new elements to match original elements in dimensions, profiles, and details. All new wood elements to be treated with preservative.

2. Backout or groove backs of flat trim members, kerf backs of other wide, flat members, except for members with ends exposed in finished work.

D. Adhesive: For exterior exposure, with minimum 15- to 14-minute cure at 70 deg F (21 deg C), in gunnable and liquid formulations as recommended in writing by adhesive manufacturer for each repair type.

1. Titebond III Exterior Ultimate Wood Glue, as manufactured by Franklin International, Columbus, OH, http://www.titebond.com.

2. Or approved equal.

2.02 REPLACEMENT WINDOW SASH

A. General: Where indicated, duplicate and replace missing or damaged sash with new sash.

Construct new sash of salvaged and sound original wood or new wood matching existing wood.

Do not use substitute materials. Fabricate sash to match original sash in size, profile, details, and number of true divided lites. Fabricate sash to fit dimensions of each existing frame. Field verify dimensions of frames where replacement sash will be installed.

1. Operating Type: Double hung.

2. Configuration: To match existing.

3. Joinery: Mortise and tenon joints. Glue and steel pin joints to hairline fit, weathertight.

B. Fasteners: Stainless steel, concealed from view.

C. Hardware: Salvaged or new hardware to match existing.

D. Glazing:

1. Glass:

a. Replacement glazing shall match original glazing in color, texture, thickness, and size.

b. Where clear use annealed glass, ASTM C 1036, Type 1, Class 1, q3.

1) Kind: Fully tempered.

2. Glazing Stops: Match existing.

3. Glazing Points: Stainless Steel.

4. Glazing Putty: Sarco Dual Glaze Putty.

a. For On-site Outside Use: Sarco Dual Glaze.

b. For Inside Shop Use: Sarco Multi-Glaze Type-M.

E. Finishes:

1. Exterior Finish: Primed and painted. See Section 09 90 00 - Painting and Coating.

2. Interior Finish: Primed and painted. See Section 09 90 00 - Painting and Coating.

3. Color(s): To match original, as selected by Owner's Representative.

http://www.titebond.com/

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F. Fabrication:

1. Fabricate wood window to match original size. Include complete system for installing and anchoring windows.

2. Glaze window in shop.

3. Complete fabrication, assembly, finishing, hardware application, and other work in shop to greatest extent possible. Disassemble components only as necessary for shipment and installation. Allow for scribing, trimming, and fitting at Project site.

2.03 WOOD FILLERS

A. Two-Part Epoxy Repair System (for woodwork to be painted):

1. Two-Part Epoxy:

a. General: Epoxy repair materials shall consist of two separate systems, two component epoxy-based primer/bonding agent and two component epoxy-based repair material meeting following physical properties.

1) Primer/Bonding Agent: Tensile strength, 7,500 psi; flexural strength, 16,503 psi;

and compression strength, 12,000 psi.

2) Repair Material: Tensile strength, 7,500 psi; flexural strength, 16,500 psi; and compression strength, 14,000 psi.

b. Epoxy Repair System by Advanced Repair Technology, Inc., Cherry Valley, NY.

http://www.advancedrepair.com/.

B. Stainable Wood Filler (for woodwork to be refinished):

1. Stainable Wood Filler by Minwax, Upper Saddle River, NJ. http://www.minwax.com/.

2. Or approved equal.

2.04 FASTENERS

A. General: Use fastener metals that are non-corrosive and compatible with each material joined.

1. Match existing fasteners in material and type of fastener unless otherwise indicated.

2. Use concealed fasteners for interconnecting wood components.

3. Use concealed fasteners for attaching items to other work unless exposed fasteners are existing fastening method.

4. For fastening metals, use fasteners of same basic metal as fastened metal unless otherwise indicated.

5. For exposed fasteners, use machine screws of head profile flush with metal surface unless otherwise indicated.

6. Finish exposed fasteners to match finish of metal fastened unless otherwise indicated.

2.05 WOOD PRESERVATIVE

A. See Section 09 90 00 - Painting and Coating.

2.06 PAINTS AND FINISHES

A. See Section 09 90 00 - Painting and Coating.

2.07 ACCESSORY MATERIALS

A. Protection Materials:

1. Polyethylene Film: Minimum 4 mil.

2. Masking Tape: Nonstaining, nonabsorbent material; compatible with chemical solutions being used and substrate surfaces; and that will easily come off entirely, including adhesive.

B. Vacuum: Soft brush tool attachments only.

C. Brushes: Natural or nylon fiber bristle only. Brushes must be free of metal parts or tape all metal ferrules with duct tape.

D. Scrapers: Plastic or wood only. Do not use metallic scrapers without written approval from http://www.advancedrepair.com/ http://www.minwax.com/

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Architect.

E. Non-abrasive scrub pads or sponges.

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F. Cloths: Clean, lint-free white cotton rags.

G. Water: Clean, potable, and free of deleterious amounts of oil, soluble salts, alkali, acids, organic impurities, or other substances. Water filters shall be used to remove contaminants if necessary.

1. Provide all hoses, valve connections, pumps, nozzles and other necessary water conveying components to provide water where needed.

H. Provide scaffolding, staging, drop cloths, covers, brushes, rollers and spraying and other equipment required for proper execution of Work.

2.08 OTHER MATERIALS

A. Other materials not specifically described, but required for complete and proper performance of work outlined in this Section, shall be new, first quality of their respective kinds, and subject to approval by Architect.

PART 3 EXECUTION

3.01 EXAMINATION

A. Verify that conditions are satisfactory for repair and restoration of architectural woodwork. If unsatisfactory conditions exist, do not commence Work until such conditions have been corrected.

3.02 PREPARATION

A. Protection:

1. Comply with manufacturers' written instructions for protecting building and other surfaces against damage from exposure to their products. Prevent chemical solutions from coming into contact with people, motor vehicles, landscaping, buildings, and other surfaces that could be harmed by such contact. At minimum, Contractor shall protect surrounding vegetation from overspray and runoff during cleaning operations.

2. Cover adjacent surfaces with materials that are proven to resist chemical products being used unless products will not damage adjacent surfaces. Apply masking agents to comply with manufacturer's written instructions. Do not apply liquid masking agent to painted or porous surfaces. When no longer needed, promptly remove masking to prevent adhesive staining.

3. Contractor shall provide visible barriers and/or warning tape around perimeter of work area for visitor protection. Nearby vehicles and adjacent structures shall be protected from damage during course of Work.

3.03 TREATMENT PROCEDURES, GENERAL

A. In treating historic elements, disturb them as minimally as possible. Repair items in place where possible.

B. Stabilize and repair wood to reestablish structural integrity and weather resistance while maintaining existing form of each item.

C. Replace entire wood member if wood damage or deterioration is greater than half the total dimension of member. Replace in-kind matching existing member in wood species, grade, grain, cut, color, and dimensions. Wood members requiring replacement shall be reviewed with Architect before removal and replacement.

D. Wood members with damage or deterioration less than half the total dimension of member shall be repaired using wood dutchman, plug, or splice, and/or two-part epoxy repair.

1. If depth of deterioration is greater than 1/4 inch but less than half depth of member, install wood dutchman, plug, or splice.

2. If depth of deterioration is greater than 1/16 inch but less than 1/4 inch, consolidate and then fill with epoxy repair compound.

3. If depth of deterioration is less than 1/16 inch, including minor scratches and gouges, leave

06 01 40 - 8 Repair and Restoration of it as is.

4. Epoxy repair is recommended where wood dutchman or splice can not be effectively installed or member to be repaired cannot be easily removed for replacement without taking apart other components

5. Epoxy repair is recommended where wood member would be difficult to replicate with new wood, such as molded member requiring sophisticated machining or laborious handwork.

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3.04 INSTALLATION, GENERAL

A. Quality Standard: Install woodwork to comply with Woodwork Institute's Architectural

Woodwork Standards.

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

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

C. Install replacement components plumb, level, true and straight with no distortions. Shim as required using concealed shims. Install to tolerance of 1/8" in 8'-0" for plumb and level; and with 1/16" maximum offset in flush adjoining surface, 1/8" maximum offsets in revealed adjoining surfaces.

D. Scribe and cut woodwork to fit adjoining work, and refinish cut surfaces and repair damaged finish at cuts.

E. Anchor woodwork to anchors or blocking built-in or directly attached to substrates. Secure with countersunk, concealed fasteners and blind nailing as required for complete installation. Use fine finishing nails for exposed fastening, countersunk and filled flush with woodwork.

F. Backpriming: Apply one coat of primer compatible with finish coat to concealed surfaces of woodwork, including back. See Section 09 90 00 - Painting and Coating.

3.05 INSTALLATION, WINDOW

A. Comply with manufacturer's written instructions for installing windows, hardware, accessories, and other components. For installation procedures and requirements not addressed in manufacturer's written instructions, comply with installation requirements in ASTM E 2112.

B. Install windows level, plumb, square, true to line, without distortion, anchored securely in place to structural support, and in proper relation to wall flashing and other adjacent construction to produce weathertight construction.

3.06 REPAIR

A. General:

1. All wood must have moisture content of 14 percent or less prior to any repairs.

B. Dutchman Repair:

1. Surface Preparation:

a. Remove all paint and other coatings from area to be repaired.

b. Remove decayed, soft, and discolored wood. Remove additional 1/2 inch of adjoining sound wood. Remaining wood shall be of even color, without red-brown and/or gray spots. No soft wood or other previous repairs shall remain.

c. Carve cavity to geometric shape to allow easier shaping of dutchman.

d. Sand bare wood, thoroughly removing loose wood fibers, paint, saw dust and dirt.

2. Cut and shape dutchman to fit cavity. Cut dutchman slightly smaller. Seam between existing wood and dutchman shall be 1/32 inch or less.

3. Mix adhesive per manufacturer's written instructions.

4. Apply adhesive to dutchman and surfaces of void, and insert dutchman. Joint shall be tight with only hairline glue lines. Dutchman shall extend minimum of 1/16-inch above surface of repaired member.

5. After adhesive has cured, carve dutchman to match profile and texture of adjoining surfaces.

6. Paint or finish repair as specified. See Section 09 90 00 - Painting and Coating.

C. Wood Filler Installation:

1. Surface Preparation:

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a. General: Prepare substrate according to manufacturer's written instructions.

b. Remove all paint and other coatings from area to be repaired.

c. Check area of removal to determine complete elimination of decayed material.

d. Remaining wood shall be of even color, without red-brown and/or grey spots.

e. No soft wood, existing brittle compounds/fillers, or other previous repairs should remain.

f. Sand to bare wood, thoroughly removing loose wood fibers, paint, saw dust, and dirt.

2. Installation of Two-Part Epoxy Repair System (for woodwork to be painted):

a. Primer: Pre-treat bare and sanded wood with primer/bonding agent.

1) Allow coupling/bonding agent to penetrate wood surface for minimum of 10 minutes and maximum of 30 minutes, or as recommended by manufacturer.

Avoid applying in direct sunlight.

2) Remove any excess bonding agent with absorbing paper.

b. Mixing: Mix epoxy repair system according to manufacturer's written instructions. Mix thoroughly and only as much as can be used within "pot life" period. Color epoxy by mixing with manufacturer-recommended dry pigments to match color of finished wood.

c. Application: Apply epoxy repair compound over uncured primer, bonding agent, or consolidant.

1) Epoxy fill shall have optimal contact with wood.

2) Avoid inclusion of air pockets during application.

3) Fill joints fill, even and smooth in one application.

d. Curing: Allow full cure time as specified by epoxy manufacturer.

e. Finishing:

1) After curing, sand surface even and smooth. Transitions and irregularities between wood and epoxy shall not be visible after sanding.

2) If required, smooth any remaining irregularities with additional application of epoxy repair compound. Always sand between coats.

3) Once fully cured, paint to match adjacent woodwork. See Section 09 90 00 - Painting and Coating.

3. Installation of Stainable Wood Filler (for woodwork to be refinished):

a. Apply wood filler to prepared substrate using manufacturer’s written instructions.

After curing, sand filled area even with existing wood surface.

b. If necessary, apply wood stain to fill to match surrounding wood color. Apply clear sealer to any newly stained areas. After sealer has dried, sand smooth with very fine sandpaper or steel wool to receive clear topcoat. See Section 09 90 00 - Painting and Coating.

D. Split Repair:

1. For splits smaller than 1/16 inch.

a. Rout out, clean, and fill split with wood filler.

b. Allow filler to cure and sand surface smooth.

2. For splits larger than 1/16 inch.

a. Shape wood strip to fill split.

b. Secure with adhesive.

c. Plane or sand flush with adjoining surface.

3. Paint or finish repairs as specified. See Section 09 9000 - Painting and Coating.

E. Securing Loose Trim:

1. Set trim in original position.

2. Secure trim with galvanized finishing nails of appropriate size. Pre-drill holes to avoid splitting wood.

3. Fill holes with wood filler matching profile and texture of adjoining surfaces.

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3.07 PAINTING AND FINISHING

A. Paint or finish repairs and replacement elements as required per Section 09 90 00 - Painting and Coating.

3.08 CLEAN-UP

A. Upon completion, remove all tools, equipment and unnecessary materials from site. Remove and dispose masking materials following completion of Work. Return adjacent areas to clean conditions that existed prior to start of Work.

B. Dispose hazardous waste materials according to manufacturer’s written instructions by legal means.

END OF SECTION