060312_SF_-_HISTORIC_WOOD_REPAIR.pdf

A&E 15021.00 MAMMOTH HOT SPRINGS HOTEL REHABILITATION – PHASE 1

MAMMOTH HOT SPRINGS

YELLOWSTONE NATIONAL PARK, WYOMING

072816

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HISTORIC WOOD REPAIR & RESTORATION

SECTION 060312 - HISTORIC WOOD REPAIR & RESTORATION

PART 1 - GENERAL

1.1 SUMMARY

A. Section includes historic treatment of wood in the form of repairing and restoring wood features as follows:

1. Repairing and restoring wood paneling, railings, interior and exterior trims, columns, and miscellaneous wood components.

B. Related Requirements:

1. Section 013591 "Historic Treatment Procedures" for general historic treatment requirements.

2. Section 080314 "Historic Treatment of Wood Doors" for historic wood door repairs, including related trim.

3. Section 080352 "Historic Treatment of Wood Windows" for historic wood window repairs, including related trim.

1.2 PREINSTALLATION MEETINGS

A. Preinstallation Conference: Conduct conference at Project site.

1. Review minutes of Preliminary Historic Treatment Conference that pertain to historic wood repair and fire protection.

2. Review methods and procedures related to historic wood repair.

1.3 ACTION SUBMITTALS

A. Product Data: For each type of product.

B. Shop Drawings: Include plans, elevations, and sections showing locations and details of each new unit and its location in the building on annotated plans and elevations.

C. Samples: For each exposed product and for each color and texture specified.

D. Mockups: For each type and quality of damage to be repaired demonstrating final process and effect.

1. Contractor shall review and identify a minimum of 3 potential locations for each type of materials to be repaired representing the full range of repair processes necessary to complete work. Recommend inconspicuous locations for testing and mockup fabrication.

Final mockup locations will be reviewed and selected by the Contracting officer in writing prior to Contractor’s execution of mockup.

2. Contractor continue to revise mockup until approval of finish effect by the Contracting Officer at no additional cost or increase in time.

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1.4 QUALITY ASSURANCE

A. Historic Treatment Specialist Qualifications: A qualified historic wood-repair specialist, experienced in repairing, refinishing, and replacing wood in whole and in part. Experience only in fabricating and installing new woodwork is insufficient experience for wood historic treatment work.

B. Wood-Repair-Material Manufacturer Qualifications: A firm regularly engaged in producing wood consolidant and wood-patching compound that have been used for similar historic wood-treatment applications with successful results, and with factory-authorized service representatives who are available for consultation, Project-site inspection, and on-site assistance.

C. Mockups: Prepare mockups of historic treatment repair processes to demonstrate aesthetic effects and to set quality standards for materials and execution, and for fabrication and installation. Prepare mockups so they are as inconspicuous as practicable and demonstrate the full range of existing conditions to be repaired. Mockup size and location shall be approved of in writing by Contracting Officer prior to execution.

1. Wood Baseboard Repair: Prepare an approximately 72-inch length of baseboard to serve as mockup to demonstrate samples of each type of wood repair.

2. Wood Panel Repair: Prepare an approximately 2 foot by 2 foot square section of paneling as mockup to demonstrate samples of each type of wood repair.

3. Wood Wainscot Trim: Prepare an approximate 72-inch length of fluted wood wainscot trim to serve as mockup to demonstrate samples of each type of wood repair.

4. Exterior Wood Column: Prepare one full size column fact to serve as mockup to demonstrate samples of each type of wood repair.

PART 2 - PRODUCTS

2.1 HISTORIC WOOD REPAIR, GENERAL

A. Quality Standard: Comply with applicable requirements in Section 12, "Historic Restoration Work," and related requirements in AWI/AWMAC/WI's "Architectural Woodwork Standards" for construction, finishes, grade rules, and other requirements unless otherwise indicated.

1. Exception: Industry practices cited in Section 12, Article 1.5, "Industry Practices," of the Architectural Woodwork Standards do not apply to the work of this Section.

2.2 REPLICATED WOOD ITEMS

A. Replicated Wood Trim: Custom-fabricated replacement wood units and components.

1. Manufacturers: Subject to compliance with requirements, provide products fabricated by manufacturers demonstrating a successful record of matching historic wood trims and profiles of similar style and complexity for a minimum of 5 years.

2. Wood Species: Match species of existing wood.

3. Wood Member and Trim Profiles: Match profiles and detail of existing in-kind.

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4. Hardware: Reuse existing unless otherwise indicated.

2.3 WOOD-REPLACEMENT MATERIALS

A. Wood, General: Clear fine-grained lumber; kiln dried to a moisture content of 6 to 12 percent at time of fabrication; free of finger joints, blue stain, knots, pitch pockets, and surface checks larger than 1/32 inch deep by 1/4 inches wide.

1. Species: Match species, graining, and appearance of each existing type of wood component or assembly unless otherwise indicated.

B. Paneling: Match existing species in-kind.

C. Exterior Trim & Columns: Match existing species in-kind.

D. Interior Trim: Match existing species in-kind.

2.4 WOOD-REPAIR MATERIALS

A. Wood Consolidant: Ready-to-use product designed to penetrate, consolidate, and strengthen soft fibers of wood materials that have deteriorated due to weathering and decay and designed specifically to enhance the bond of wood-patching compound to existing wood.

1. Products: Subject to compliance with requirements, available products that may be incorporated into the Work include, but are not limited to, the following:

a. Abatron, Inc.; LiquidWood.

b. Gougeon Brothers, Inc.; West System.

c. System Three Resins, Inc.; RotFix.

2. Provide products that do not alter the appearance of the wood upon final finishing and are compatible with all repair products required to achieve final finished result.

B. Wood-Patching Compound: Two-part, epoxy-resin, wood-patching compound; knife-grade formulation as recommended in writing by manufacturer for type of wood repair indicated, tooling time required for the detail of work, and site conditions. Compound shall be designed for filling voids in damaged wood materials that have deteriorated due to weathering and decay.

Compound shall be capable of filling deep holes and spreading to featheredge.

1. Products: Subject to compliance with requirements, available products that may be incorporated into the Work include, but are not limited to, the following:

a. Abatron, Inc.; LiquidWood with WoodEpox.

b. Gougeon Brothers, Inc.; West System thickened with filler.

c. System Three Resins, Inc.; Sculpwood.

2.5 MISCELLANEOUS MATERIALS

A. Borate Preservative Treatment: Inorganic, borate-based solution, with disodium octaborate tetrahydrate as the primary ingredient; manufactured for preserving weathered and decayed

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wood from further damage caused by fungi and wood-boring insects; complying with AWPA P5;

containing no boric acid.

B. Cleaning Materials:

1. As determined based on test results conducted under the requirements of Section 060310 “Interior Wood Cleaning & Restoration” for interior wood surfaces.

2. Restoration wood cleaner produced specifically formulated for exterior wood cleaning and recommended for use by the manufacturer for the specific application to which the material will be used.

C. Adhesives: Wood adhesives with minimum 15- to 45-minute cure at 70 deg F, in gunnable and liquid formulations as recommended in writing by adhesive manufacturer for each type of repair and exposure condition.

D. Fasteners: Use fastener metals that are noncorrosive 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 unavoidable or the existing fastening method.

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

5. For exposed fasteners, use fasteners to match in-kind historic and of head profile flush with metal surface unless otherwise indicated.

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

2.6 WOOD FINISHES

A. Unfinished Replacement Units: Provide exposed interior wood surfaces of replacement units unfinished; smooth, filled, and suitably prepared for on-site finishing.

B. Factory-Primed Replacement Units: Provide factory-primed primer coat on all faces and ends of exterior wood surfaces; compatible with indicated finish coating and suitably prepared for on-site finishing.

PART 3 - EXECUTION

3.1 PREPARATION

A. Clean wood of mildew, algae, moss, plant material, loose paint, grease, dirt, and other debris by scrubbing with natural bristle brush or sponge and detergent solution specifically developed for historic wood cleaning. Scrub mildewed areas with mildewcide. After cleaning, rinse thoroughly with fresh water. Allow to dry before repairing or painting.

B. Condition replacement wood members and replacement units to prevailing conditions at installation areas before installing.

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3.2 HISTORIC WOOD REPAIR, GENERAL

A. General: In treating historic items, disturb them as minimally as possible and as follows:

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

2. Remove coatings and apply borate preservative treatment before repair at exterior wood elements.

3. Repair items in place where possible.

4. Install temporary protective measures to protect wood-treatment work that is indicated to be completed later.

5. Refinish historic wood per the requirements listed in other sections based on the finish to be applied.

B. Mechanical Abrasion: Where mechanical abrasion is needed for the work, use only the gentlest mechanical methods, such as scraping and natural-fiber bristle brushing, that will not abrade wood substrate, reducing clarity of detail. Do not use abrasive methods, such as sanding, wire brushing, or power tools, except as approved by Contracting Officer.

C. Repair and Refinish Existing Hardware: Dismantle hardware; strip paint, repair, and refinish it to match finish samples; and lubricate moving parts just enough to function smoothly.

D. Repair Wood: Match existing materials and features, retaining as much original material as possible to perform repairs.

1. Unless otherwise indicated, repair wood by consolidating, patching, splicing, or otherwise reinforcing wood with new wood matching existing wood or with salvaged, sound, original wood.

2. Where indicated, repair wood by limited replacement matching existing material.

E. Replace Wood: Where indicated or required due to condition, duplicate and replace units with units made from salvaged, sound, original wood or with new wood matching existing wood. Use surviving prototypes to create patterns for duplicate replacements.

F. Identify removed items with numbering system corresponding to item locations, to ensure reinstallation in same location.

3.3 WOOD PATCH-TYPE REPAIR

A. General: Patch wood that exhibits depressions, holes, or similar voids, and that has limited amounts of rotted or decayed wood.

1. Treat wood with wood consolidant prior to application of patching compound. Coat wood surfaces by brushing, applying multiple coats until wood is saturated and refuses to absorb more. Allow treatment to harden before filling void with patching compound.

2. Remove rotted or decayed wood down to sound wood.

B. Apply borate preservative treatment to accessible surfaces either before applying wood consolidant or after removing rotted or decayed wood at exterior wood to be restored.

C. Apply wood-patching compound to fill depressions, nicks, cracks, and other voids created by removed or missing wood.

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1. Prime patch area with application of wood consolidant or manufacturer's recommended primer.

2. Apply patching compound in layers as recommended in writing by manufacturer until the void is completely filled.

3. Sand patch surface smooth and flush with adjacent wood, without voids in patch material, and matching contour of wood member.

3.4 WOOD-REPLACEMENT REPAIR

A. General: Replace parts of or entire wood items at locations where indicated or damage is too extensive to patch.

1. Remove broken, rotted, and decayed wood down to sound wood.

2. Custom fabricate new wood to replace missing wood; either replace entire wood member or splice new wood part into existing member.

3. Secure new wood using finger joints, multiple dowels, or splines with adhesive and nailing to ensure maximum structural integrity at each splice. Use only concealed fasteners. Fill nail holes and patch surface to match surrounding sound wood.

B. At exterior wood elements to be repaired, apply borate preservative treatment to accessible surfaces after replacements are made. Apply treatment liberally by brush to joints, edges, and ends; top, sides, and bottom.

C. Repair remaining depressions, holes, or similar voids with patch-type repairs.

D. Reinstall items removed for repair into original locations.

END OF SECTION 060312