FRSP_Addendum_to_SOW_080152_Window_Rehab__06_17__2015.pdf

FREDERICKSBURG AND SPOTSYLVANIA NMP PMIS #: 162500

CEMETERY LODGE / QUARTERS #00001 INTERIOR REHABILITATION

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SECTION 080152

WOOD WINDOW REHABILITATION

PART 1 GENERAL

1.1 SUMMARY

A. This section sets forth the Government’s requirements for rehabilitating existing historic wood double-hung and casement windows.

1. First Floor: 12 Double Hung Windows;

2. Second Floor: 10 Casement Windows.

B. The Contractor shall provide all labor, materials, equipment and services necessary to complete the work as indicated on the drawings, as specified herein, as required by referenced and industry standards, applicable codes and existing field conditions.

C. General Requirements:

1. Existing materials shall be reused whenever possible in the repair of historic wood windows. This includes all wood elements and original hardware.

Replacement of window elements with new material shall be done only when historic elements are so deteriorated as to prohibit their useful function.

2. Work includes restoration of existing wood window units, including selective dismantling; stripping of existing paint; repair or replacement of deteriorated wood components; fabrication of new components (including complete window sash and frames) to replace missing or severely deteriorated window components; repainting wood surfaces; installing new glass; and reinstalling wood window sash, rebalancing and adjusting operation as needed. Salvage all existing counterweights, pulleys, hinges, and other hardware necessary to enable installation, and provide replica hardware as needed.

1.2 RELATED DOCUMENTS

A. Division 01 Sections and all other Contract Requirements;

B. Section 085169 - Aluminum Storm Sash;

C. Section 099000 - Painting.

1.3 REFERENCES

A. The Secretary of the Interior’s Treatment for Historic Properties (SISTHP);

B. U.S. Department of the Interior Preservation Briefs 9: The Repair of Historic Wooden Windows;

C. American Architectural Manufacturers Association (AAMA)

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D. Code of Federal Regulations: 29 CFR 1910.1000-1500, Subpart Z, “Toxic and Hazardous Substances”

E. Glazing Publications: Comply with published recommendation of glass manufacturers and GANA's Glazing Manual unless more stringent requirements are indicated.

F. Architectural Woodwork Institute: Comply with applicable requirements in AWI's Architectural Woodwork Standards for construction, finishes, grades of wood windows, and other requirements.

G. Master Paint Institute (MPI): Comply with applicable requirements in MPI standards for preparation and painted finishes and other requirements.

1.4 EXISTING WINDOW SYSTEM DESCRIPTIONS

A. Hazardous Materials: Previous studies have identified some locations of existing lead.

-based paint, asbestos-containing materials, and other potentially hazardous materials.

B. The intent of this project is to remove all hazardous materials from the site and to dispose of the materials properly.

C. Window System Component Descriptions: Window component terminology shall be as identified in Preservation Briefs 9: The Repair of Historic Wooden Windows.

1.5 QUALITY ASSURANCE

A. Applicator: A firm or individual experienced in historic treatment and repair of windows similar in material, design, and extent to that indicated for this Project, whose work has resulted in construction with a record of successful in-service performance, with a minimum of five (5) years experience in construction and supervision of architectural wood repair work. See Article 1.5 - Submittals for further requirements.

B. Master Painters Institute (MPI) - Architectural Painting Specification Manual:

1. Products: Complying with MPI standards indicated and listed in “MPI

Approved Products List”.

2. Preparation and Workmanship: Comply with requirements in “MPI

Architectural Painting Specification Manual” for products and paint systems indicated.

C. Mockups:

1. Wood Window Repair: Prepare one window unit to serve as a mockup to demonstrate sample repair of wood window members including frame, sash, glazing, hardware, and paint coatings.

2. Sample windows to be repaired as mockups will be selected by the Government and shall include representative existing distress conditions.

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3. Approved mockups shall become part of the completed Work if undisturbed at time of Substantial Completion.

4. Verify water tightness of restored window unit by testing joinery, glazing, and sash and frame perimeters using handheld nozzle in accordance with AAMA

501.2. Adjust installation as needed to prevent water leakage. Pressure shall be set at 20 psi.

1.6 SUBMITTALS

A. Preconstruction Submittals: Submit pursuant to Section 013000 “Administrative Requirements”.

1. Applicator’s Qualifications: submit list of 3 projects rehabilitating historic windows completed within the last five (5) years. Submit on applicator’s letterhead.

B. Action Submittals: Submit pursuant to Section 013000 “Administrative Requirements”.

1. Work Plan: After thoroughly surveying existing windows, prepare and submit a project specific written plan describing the sequence, means, materials, and methods for each phase of the rehabilitation process for each windows. Work Plan shall address protection of surrounding materials within the Project Area and adjacent areas not scheduled for Work under this Contract.

2. Product data: Manufacturer’s product literature, technical data, and MSDS for each product indicated. Include product description, application procedures, precautions, limitations in use of products, and test reports and certifications substantiating that products comply with requirements.

3. Samples:

a. For each type of paint system and each color and gloss of topcoat indicated submit samples incompliance with Section 099000 - Painting.

b. Metal weather-stripping.

c. All fasteners and intended use.

1.7 JOB CONDITIONS

A. Verify window openings by field measurements before fabrication of replacement windows, if required.

B. Protection:

1. Work during inclement weather may be performed only if adequate protection from the elements is provided such that the building interior and its contents are not exposed to the elements.

2. Protect surrounding interior and exterior surfaces and finishes from damage during the execution of window repair.

3. In areas where coating systems are to be applied, protect all building features, sidewalk paving, and landscaping from drippage or other effects of coatings.

4. Protect unfinished work at the end of each day’s work activities.

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C. All work shall be performed in accordance with NFPA 30 Flammable and Combustible Liquids Code and OSHA 39 CFR, Prt 1910. Adhere to the manufacturer’s instructions for safe applications of all cleaning, sealing, resurfacing and stripping materials.

D. Adequate ventilation shall be provided in each area that solvents, cleaners, strippers and varnished are used, so that accumulations of volatile vapors is below flammable and/or explosive range.

E. Apply paints only when temperature of surfaces to be painted and ambient air temperatures are between 50 and 95 degrees Fahrenheit. Do not apply paints in snow, rain, fog, or mist; when relative humidity exceeds 85 percent; at temperatures less than 5 degrees Fahrenheit above the dew point; or to damp or wet surfaces.

PART 2 PRODUCTS

2.1 REPLACEMENT WOOD MATERIALS

A. Wood: 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.

B. Selective Replacement of Individual Sash and Frame Components: To match the existing window species and as approved by the government. Existing window material is believed to be Southern yellow pine - Contractor shall verify.

2.2 WOOD PATCHING MATERIALS

A. Wood Consolidant: Ready-to-use product designed for hardening and sealing soft fibers of wood materials that have deteriorated due to weathering and exposure and designed specifically to enhance the bond of wood patching compound to existing wood.

1. Subject to meeting the salient characteristics specified and Government approval, the following products are acceptable:

a. Abatron, Inc.; Liquidwood;

b. Advanced Repair Technology; Primatrate;

c. Gougeon Brothers, Inc.; West System;

d. Other products meeting the specified salient characteristics and as approved by the Government.

B. Wood Epoxy Repair: 2-part epoxy-resin wood compound with a 10 to 15-minute cure at 70 deg F, in knife grade formulation and recommended by manufacturer for type of wood repair indicated. Compound shall be designed for filling damaged wood materials that have deteriorated due to weathering and exposure. Compound shall be capable of filling deep holes and capable of spreading to feather-edge.

1. Subject to meeting the salient characteristics specified and Government approval, the following products are acceptable:

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a. Abatron, Inc.; Liquidwood with WoodEpox;

b. Advanced Repair Technology; Primatrate with Flex-Tec HV;

c. Gougeon Brothers, Inc.; West System;

d. Other products meeting the specified salient characteristics and as approved by the Government.

2.3 GLAZING MATERIALS

A. Replacement Glass: Match existing.

B. Glazing Putty: Oil-based, non-staining and non-bleeding:

1. Subject to meeting the salient characteristics specified and Government approval, the following products are acceptable:

a. Wonder Putty, manufactured by Atlas Putty Products Tinley Park, Illinois.

b. DAP 33 Glazing, manufactured by DAP Inc., Baltimore, Maryland.

c. Other products meeting the specified salient characteristics and as approved by the Government.

C. Glazing Points: Type 304 stainless steel; Diamond point as small as possible to achieve required results.

2.4 WINDOW HARDWARE

A. Weather-stripping (to replace damaged or missing existing weather-stripping):

1. Meeting rail: Spring brass weather stripping with hemmed edges and matching brass nails.

2. Jamb, sill, and head: Channel groove brass weather stripping, width to match thickness of sash by 0.008 inch, with hemmed edges and matching brass nails.

3. Subject to meeting the salient characteristics specified and Government approval, the following products are acceptable:

a. Dorbin Metal Strip Mfg. Co., Inc.

b. Pemko Manufacturing Co., Inc.

c. Other products meeting the specified salient characteristics and as approved by the Government.

B. Repair and Refinish Existing Hardware: Remove window hardware and repair and refinish to match original approved samples.

C. Salvage and reuse existing pulleys, counterweights, and hinges. Provide complete sets of window installation hardware for each window unit.

D. Salvage and reuse existing sash lifts, locks, latches, and handles.

E. Replacement Window Hardware: Replace existing damaged or missing window hardware with new hardware to match existing:

1. Material: Match existing.

2. Design: Provide manufacturer’s standard hardware to replicate existing hardware and compatible with existing wood window components.

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3. Window Hardware Finishes: Match existing.

2.5 SEALANTS

A. Single Source Responsibility: Use products of a single manufacturer to ensure continuity.

B. Acceptable Manufactures:

1. Dow Corning

2. GE;

3. DAP;

4. Or other as approved by the Government.

C. Sealant: Silicone sealant.

D. Bond breakers: Approved manufacturer’s standards.

E. Color: to be selected from manufacturer’s standard colors.

2.6 COATING FOR WOOD

A. Comply with requirements of Section 099000 - Painting.

B. Basis-of-Design is Sherwin Williams Sher-Cryl High Performance Acrylic paint.

Other products of the following manufacturers are acceptable subject to complying with the specified salient characteristics:

1. Benjamin Moore;

2. Rustoleum;

3. Devoe;

4. Or other manufacturers meeting the salient characteristics specified and as approved by the Government.

C. High Performance Acrylic Paint Salient Characteristics: Ambient cured, one component acrylic coating with superior exterior performance properties meeting the following standards:

1. Adhesion: ASTM D4541;

2. Weathering: ASTM D5894;

3. Flexibility: ASTM D522;

4. Humidity Resistance: ASTM D4585 - 1,250 hours;

5. Thermal Cycling: STM D2246 - 10 Cycles.

2.7 PAINT REMOVER

A. Heat may not be used to remove paint from wood components.

B. Paint stripper: chemical stripper intended to remove paint, free of methylene chloride.

1. Subject to meeting the salient characteristics specified and Government approval, the following products are acceptable:

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a. Peel-Away 7, manufactured by Dumond Chemicals, New York, New York, or equal approved by the Government.

b. Other products meeting the specified salient characteristics and as approved by the Government.

C. Sandpaper of various grades to remove paint remnant following application of chemical stripper. Take appropriate protective measures to mitigate negative impacts of dust.

D. Plastic scrubber for removing paint and stripper residue from metal items.

E. Trisodium Phosphate-type detergent solution.

F. Carbide Blade Scraper.

G. Alternately, steam may be used to remove paint and glazing compounds. Contractor shall include a detailed description of the proposed steam stripping process in the required Work Plan if this alternative is proposed. See Article 1.6 for Work Plan Requirements.

2.8 MISCELLANEOUS MATERIALS

A. Cleaning Materials: Solution of 2 cups of Tetrasodium Polyphosphate (TSP), 1/2 cup of laundry detergent, 5 quarts of 5 percent sodium hypochlorite bleach, and 15 quarts of warm water for each 5 gallons of solution required.

B. Fasteners: Provide fasteners compatible with window members, trim, hardware, anchors and other components.

C. Exposed Fasteners: If exposed fasteners are used, match head style of existing fasteners.

D. Anchors, Clips, and Accessories: Fabricate anchors, clips, concealed window structural attachments, and all accessories in contact with masonry of Type 304 stainless steel complying with requirements in ASTM B 633 for SC 3 (Severe) service condition.

E. Fluted Wood Dowels: Hardwood, 3/8 inch diameter.

F. Adhesive: Polyurethane based wood adhesive with a 15- to 45-minute cure at 70 deg F (21 deg C), in formulated for use with an application gun and recommended by adhesive manufacturer for exterior wood repair.

2.9 STORM WINDOWS

A. Comply with Section 085169 requirements.

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PART 3 EXECUTION

3.1 GENERAL

A. Rehabilitation of historic windows shall comply with the SISTHP.

B. Existing materials shall be retained and reused whenever possible in the rehabilitation for the historic windows. This includes all wood elements, hardware and glass that are determined to be of historic significance.

1. Replacement of window elements with new material shall be done only when historic elements are so deteriorated as to prohibit their useful function.

2. If new elements are used, they shall match existing in materials, construction and appearance.

C. All existing window components shall be rehabilitated. Window components include, but may not be limited to:

1. Sash (interior and exterior);

2. Frame (interior and exterior);

3. Exterior sill;

4. Exterior masonry stops;

5. Exterior casings and trim;

6. Hardware.

3.2 EXAMINATION

A. Contractor shall make an up-close survey of the interior and exterior condition of each window and prepare a detailed Work Plan describing the proposed work for each window. See Article 1.6 - Submittals for further requirements.

3.3 PRECONSTRUCTION

A. Identification:

1. Prior to proceeding with removal of window sash, develop an identification system to mark each frame, sash, fastener, and hardware for exact location on the building to enable proper reinstallation.

2. Corresponding identification shall be made on drawing and copies shall be provided to the Government.

B. Protection:

1. Install temporary window enclosures for protection of building interior during the work. Temporary protection shall be installed in such a manner as to not damage remaining elements on the building scheduled to be retained.

2. Care should be exercised not to damage the frame, sash, or adjacent building elements.

3. After removal, the sash shall be stored in a dry location, above ground and with proper protection for weather and to prevent damage.

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3.4 REHABILITATE EXISTING SASH

A. Remove and salvage existing sashes, interior stops, and parting stops from the frames.

Salvage counterweights and pulleys where present; discard existing rope cords.

Existing frame shall remain in place at all locations.

B. Existing storm windows, security screens, insect screens, etc.:

1. Remove and discard at First Floor windows.

2. Remove screens where existing and retain for reinstallation at Second Floor.

C. Remove and discard existing joint sealants at window perimeters and joinery, including at the joint between wood window framing and adjacent masonry.

1. Existing sealant may contain hazardous materials; comply with all requirements relating to containment and proper disposal of hazardous components.

D. Remove and discard existing glazing compound(s), loose paints and coatings from all glass and wood surfaces including glazing, sash, stops, frame, sill, brick mold, and interior stool and trim.

1. Existing glazing compound(s) and coatings may contain asbestos, lead or other hazardous materials; comply with all requirements relating to containment and proper disposal of hazardous components.

E. Inspect wood surfaces of sash, frame, and sill for rot, insect damage, warping, or other deficiencies and repair as specified - see Article 3.5 for requirements.

F. Restore existing hardware. Hardware includes but not limited to: pulleys, locks, and handles.

1. Remove existing paints or coatings.

2. Clean corrosion from metal surfaces. Coat iron or steel elements with paint.

3. Lubricate all moving parts.

G. Apply specified primer to all wood surfaces and allow to cure fully as recommended by manufacturer.

H. Re-glaze window sash reusing original glass with new glazing points and glazing compound. Broken glass shall be replaced to match existing.

I. Apply specified intermediate paint coating and allow to cure fully as recommended by manufacturer.

J. Replace weather-stripping if cracked, split, or missing

K. Reinstall window sash, using original hardware where available. Hang double hung sash on new cotton rope and reusing original counterweights where present. Adjust stops to ensure a tight fit and smooth operation.

L. With window fully closed, apply specified finish paint coating to all wood surfaces and allow to cure fully as recommended by manufacturer.

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M. Reinstall other new or salvaged hardware.

N. Install new sealant at all exterior joints between wood window framing and adjacent masonry.

O. Coordinate installation of new storm windows.

3.5 WOOD REPAIRS

A. Examination and Evaluation:

1. Verify actual extent of deteriorated wood at each location.

B. If deterioration is less than 1/8 inch deep, no repair is necessary.

C. If deterioration is deeper than 1/8-inch, but less than half the depth of the member and/or less than 33-percent of the existing member is compromised/deteriorated make epoxy repairs as recommended by epoxy manufacturer and as follows:

1. Remove either with dry scraping or solvent-based chemical strippers all non-adhered, “alligatored” or heavily built-up paint down to sound paint or bare wood.

2. Remove all paint, down to wood substrate, in the immediate vicinity of each repair.

3. Insure member to be repaired is clean and dry.

4. Mix and use epoxy components in accordance with manufacturer’s instructions;

for respective applications as consolidants, adhesives, and fillers. Add bulking agents (micro-balloons), in volumes not exceeding manufacturer's recommendations, to increase post-cure workability.

5. After cure, dress repair to final shape, blending surface of repair to surface of original material without apparent joint.

D. Where deterioration is deeper than half the member and/or exceeds 33-percent of the existing member is compromised/deteriorated replace existing member. See Article

3.6 - Wood Replacement for further requirements.

3.6 WOOD REPLACEMENT

A. If depth of deterioration is greater than half the thickness of the member or exceeds 33-percent of the entire member, the entire member shall be replaced.

1. Carefully remove fasteners at deteriorated member.

2. Remove deteriorated member, taking care not to damage adjacent members.

3. Remove adhesive residue and fasteners from adjacent members.

4. Fabricate new members to match existing size, thickness, shape, and length.

5. Replacement members shall be set square. Profiles and exterior surfaces shall be flush with adjacent surfaces.

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3.7 COATING PREPARATION

A. Existing paints and coatings shall be removed to a sound, paintable substrate - either sound paint or bare wood.

B. Areas of paint removed shall be prepared by approved method.

1. All parts shall be cleaned by brush using detergent solution, and let dry.

2. Clean substrates of substances that could impair bond of paints, including dirt, oil, grease, and incompatible paints and encapsulants.

C. Examine substrates and conditions for compliance with requirements for maximum moisture content and other conditions affecting performance of work.

D. Maximum Moisture Content of Substrates: When measured with an electronic moisture meter as follows:

1. Wood: 15 percent.

E. Verify suitability of substrates, including surface conditions and compatibility with existing finishes and primers.

1. Begin coating application only after unsatisfactory conditions have been corrected and surfaces are dry. Beginning coating application constitutes Contractor's acceptance of substrates and conditions.

F. Sand surfaces that will be exposed to view, and dust off.

3.8 COATING APPLICATION

A. Comply with manufacturer's written instructions and recommendations in “MPI Architectural Painting Specification Manual” applicable to substrates and paint systems indicated.

B. Use applicators and techniques suited for paint and substrate indicated.

C. Paint surfaces behind movable items same as similar exposed surfaces. Before final installation, paint surfaces behind permanently fixed items with prime coat only.

D. Do not paint:

1. Non-ferrous metal components;

2. Side rails of double-hung window jambs.

E. Prime edges, ends, faces, undersides, and backsides of wood.

F. After priming, fill minor holes and imperfections in the finish surfaces with putty or plastic wood filler. Sand smooth when dried.

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G. Tint each undercoat a lighter shade to facilitate identification of each coat if multiple coats of same material are to be applied. Tint undercoats to match color of topcoat, but provide sufficient difference in shade of undercoats to distinguish each separate coat.

H. If undercoats or other conditions show through topcoat, apply additional coats until cured film has a uniform paint finish, color, and appearance.

I. Apply paints to produce surface films without cloudiness, spotting, holidays, laps, brush marks, roller tracking, runs, sags, ropiness, or other surface imperfections. Cut in sharp lines and color breaks.

3.9 GLAZING

A. Bed new or re-used glass lights in glazing putty in restored, primed wood window sash.

B. Install new stainless steel glazing points at locations and in sufficient quantity to ensure appropriate support. Care should be taken to ensure that the glazing points adequately support the glass.

C. Install new glazing putty in profile and depth to match existing. Care should be taken to develop a proper profile (concave) to shed water. Maintain original sightlines of wood sash. Glazing compound installation should create bond between putty and window frame. Allow putty to properly cure prior to coating as recommended by manufacturer.

3.10 HARDWARE

A. Provide salvaged or new hardware for all windows. Hardware includes but not limited to: pulleys, counterweights, locks and latches, handles, and lifts. Provide new brass chain for all counterweighted window sash.

B. Hardware restoration:

1. Remove hardware from wood window elements. Record locations so that each hardware item is returned to its original location.

2. Document individual units where window hardware typical to the building is missing.

3. Soak hardware item in chemical paint stripper to remove existing paint build-up.

Do not soak existing brass-finished hardware items that are free of paint.

4. Scrub with plastic pads to remove paint and thoroughly rinse stripper residue.

5. Spray apply coating to iron or galvanized hardware items. Color: black or other color acceptable to Government.

6. Reinstall hardware to original window. Use solid brass screws to install brass or bronze hardware items. Use stainless steel screws with coated heads to install iron or galvanized hardware items.

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C. Missing hardware shall be replaced to match existing to the greatest extent possible.

If matching hardware cannot be procured, submit alternative to Government for approval prior to proceeding.

3.11 REINSTALLATION OF SASH

A. Install rehabilitated window sash level, plumb, square, true to line, without distortion or impending thermal movement, and securely in place with stops. Provide new parting stops as required, finished to match adjacent original wood surfaces and milled to fit securely in existing frame rabbet.

B. Coordinate reinstallation of sash with installation of new storm windows. See Section 085169 for requirements.

1. Clean all glass prior to installing new storm sash.

3.12 SEALANT

A. Install new bond breaker/backer rod and sealant as recommended by manufacturer at perimeter of wood frame and sill at joint with masonry substrate.

3.13 ADJUSTMENT, CLEANING AND PROTECTION

A. Clean glass promptly after installation, exercising care to avoid damage to finish of new and existing surfaces. Wash and polish glass on both faces not more than four (4) days prior to date scheduled for final inspection. Comply with glass manufacturer’s recommendations for final cleaning and maintenance.

B. Remove and replace glass which has been broken, chipped, cracked, abraded or otherwise damaged during construction period, including that damaged by natural causes, accidents and vandalism.

C. Touch-up any painted areas of the Work that may have been affected during the Work.

D. Remove all protective materials and clean up construction debris.

3.14 FIELD QUALITY CONTROL

A. Permit the Government to make random inspections of Work in process on and off-site and completed repairs.

3.15 COMPLETION

A. The completed rehabilitation will result in windows that operate smoothly, are water-tight, meet specified air tightness requirements and allow for installation of new storm sash without interior condensation.

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3.16 CLEAN-UP

A. Remove waste materials, debris and rubbish from site at the end of each working day.

B. After completing paint application, clean spattered surfaces. Remove spattered paints by washing, scraping, or other methods. Do not scratch or damage adjacent finished surfaces.

C. Protect work of other trades against damage from paint application. Correct damage to work of other trades by cleaning, repairing, replacing, and refinishing, as approved by Architect/Engineer, and leave in an undamaged condition.

D. At completion of construction activities of other trades, touch up and restore damaged or defaced painted surfaces.

E. Upon completion of work, remove all debris and construction material from site.

Leave site in clean condition.

END OF SECTION