050385 HISTORIC DECORATIVE FORMED METAL REPAIR_WR IR_ADD1.pdf

Fort Bliss National Cemetery VA Project 886CM3026

Gravesite Expansion Bid Documents

El Paso, TX 79906 Addendum 1

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SECTION 05 03 85

HISTORIC TREATMENT OF DECORATIVE FORMED METAL

PART 1 - GENERAL

1.1 DESCRIPTION

A. This section specifies historic treatment of decorative formed metal as follows:

1. Chemically removing paint from wrought iron, cast iron and steel handrails and guardrails.

2. Repairs and refinishing of handrail and guardrail metal at the

Rostrum shall occur in place.

3. Removing and dismantling handrails at the Administration Building for refinishing while stucco repair is in progress. Refinishing to occur on site and reinstallation of handrails in the same location as existing.

B. The Contractor shall provide all labor, material, equipment, and operations required to complete the rehabilitation work indicated herein.

1.2 RELATED WORK

A. 09 91 00, PAINTING: Primer and Painting requirements.

B. Contract Drawings, Material Schedules: Paint specified for handrail and guardrail refinishing; type of finish, color, gloss level of finish coat.

1.3 SUBMITTALS

A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT

DATA, AND SAMPLES.

B. Manufacturer’s Literature:

1. Provide for all proprietary products.

3. Include installation instructions along with product data. Product data shall include recommendations for product application and use.

Add notation to each product data identifying where the product will be used on the project.

C. Shop Drawings:

1. Include plans, elevations and sections showing locations and extent of repair and replacement work, indicating any replacement parts necessary, method of re-attachment (when a metal component was removed for repair work), accessory items and finishes.

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a. Dimensions for any new, decorative formed metal components and their jointing, show relation of existing to new components.

b. Templates and directions for installing anchor bolts and other anchorages.

c. Identification of each new metal item and component and its location on the structure in annotated plans and elevations.

d. Provisions for soldered, welded, and sealant joints where required.

D. Samples for Verification:

1. New fittings and brackets

2. Each type of fastener, anchor, accessory and miscellaneous support in required finishes.

E. Project Safety Plan: to include at minimum any personal protective equipment to be used by the contractor’s staff such as disposable clothing, gloves, safety glasses, procedures for emergencies and accidents, documentation of staff training in use of equipment and/or chemical products as required by the manufacturers.

F. Maintenance and Warranty Requirements: For all restored and newly installed materials.

G. Qualification Data: Restoration Specialist: Provide list of at least 3 projects of firm performing with similar scope including historic decorative formed metal repair which demonstrate adherence to historical conservation standards covering at least 10 previous years since this project was bid.

H. Decorative Formed Metal Historic Treatment Program

1. Historic Treatment Specialist to prepare a written, detailed description of materials, methods, equipment, and sequence of operations to be used for historic treatment work, including each process or phase of repairing decorative formed metal, related work, and the protection surrounding materials and project site.

2. If materials and methods other than those indicated are proposed for any phase of historic treatment work, add a written description of such materials and methods, including evidence of successful use on comparable projects, and demonstrations to show their effectiveness for this Project.

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1.4 QUALITY ASSURANCE

A. Historic Treatment Specialist Qualifications: A qualified, historic repair firm with at least 10 years experience completing projects with similar scope, including historic formed metal repair and working knowledge of The Secretary of the Interior’s Standards for the

Treatment of Historic Properties with Guidelines for Preserving, Rehabilitating, Restoring and Reconstructing Historic Buildings.

Specialist executing the work in the field shall have at least 5 years experience in installing and finishing new or repairing existing historical decorative formed metalwork.

1.5 DELIVERY, STORAGE AND HANDLING

A. The Contractor shall:

1. Deliver restoration cleaning and proprietary products to the project site in manufacturer’s or distributor’s packaging, undamaged, complete with application instructions and Safety Data Sheets (SDS).

2. Transport and store cleaning agents, chemicals, and solvents within the temperature range recommended by the manufacturer and away from direct sunlight. Handle all materials according the manufacturer’s instructions.

3. Collect and dispose of waste material, packaging, debris, and effluent associated with the work in accordance with local, state, and federal environmental regulations.

1.6 SAFETY

A. No food or drink shall be allowed near any work station so as to prevent contamination from paint, paint chips or paint dust which may contain lead and other toxic substances.

1. Paint being removed most likely will contain lead. All workmen must wear protective clothing (including hair) goggles, and respirators with proper filters.

B. Protective clothing shall be removed at the end of each day and kept at the site to prevent workers from taking dust and paint chips to other parts of the site or to their homes.

C. Wash hands and face often, especially before eating and at the end of the day.

D. All waste material shall be collected at the end of each work day and disposed of in a manner consistent with local environmental regulations. It is considered Hazardous Waste.

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E. Work area shall be sealed to prevent the spread of paint dust and debris beyond the work site.

F. After paint removal is complete, all areas around the building shall be cleaned of all paint dust and debris, and such debris shall be properly disposed of in a manner consistent with local environmental regulations.

G. The Contractor shall use chemical products whose safety data sheets

(SDS) have been reviewed and considered acceptable by the Government.

H. Any project surfaces containing lead-based paint, as disclosed by the

Government, shall be handled by the contractor in accordance with OSHA

(29 CFR 1926.62), EPA (40 CFR 261) and State regulations. Any lead-based paint or coating that is removed in a project resulting from this scope shall undergo Toxicity Characteristic Leaching Procedure (TCLP) testing by the contractor. The Contractor shall dispose of any lead-paint waste as hazardous if it fails the TCLP.

I. All paint or coating required to be removed shall be tested for lead by the contractor. All paints and coatings testing positive shall be handled and disposed of as lead-based.

J. The contractor shall isolate the work area with cones, tape or similar means as possible for the duration of the project, to prevent unauthorized individuals from entering the immediate work area.

1.7 PROJECT / SITE CONDITIONS

A. Weather Limitations: Proceed with historic treatment of decorative formed metal only when existing and forecasted weather conditions are within the environmental limits set by each manufacturer’s written instructions and specified requirements.

B. The Contractor is responsible for protecting existing adjacent areas and materials during execution of the work and shall provide all necessary protection and follow all necessary work procedures to avoid damage to existing material assemblies and vegetation not a part of the work of this Section.

C. At a minimum, the Contractor shall:

1. Protect woodwork, glass, metal, and any material adjacent to metals to be cleaned from overspray and possible chemical or water damage from cleaning operations.

2. Protect surrounding vegetation from runoff during cleaning operations.

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3. Exterior work areas should be accessed from the exterior only.

Under no circumstances are hoses to be run or equipment transported through a building during exterior cleaning operations.

4. If necessary, the Contractor shall erect waterproof enclosures around areas where treatment operations are in progress to protect nearby property and passers-by from overspray of chemicals or rinse water.

D. The Contractor shall coordinate treatment operations with the other trades involved in exterior and interior restoration work, including but not limited to masonry restoration, concrete replacement, sealing, painting, military seal and associated foundations at the Rostrum, etc.

E. All Contractor personnel performing treatment operations shall be provided by the Contractor with gloves, respirators, protective clothing and any other personal protective equipment (PPE) as recommended by the manufacturer of the products used during the work and required by local, state, and federal regulations.

PART 2 - PRODUCTS

2.1 PRODUCTS

A. Commercial Chemical Paint/Lacquer Removers:

1. Manufacturer’s standard thixotropic formulation for removing paint coatings from ornamental metal work. Review manufacturer’s literature to identify least hazardous products that may be effective for initial testing. Manufacturers:

a. ProSoCo, Inc.: EnviroKlean Safety Peel 1

b. Star Bronze Co.: Zip Strip 2

c. Savogran Company: Biodegradable Strypeeze

d. Deidrich Technologies: Envirestrip

e. or other Manufacturer products performing equal to or better

2. Semi-paste, water rinsing, nonbenzol remover such as “Strypeeze Semi

Paste” (Savogran Company) or approved equal that meet the design intent.

a. Characteristic orange color

b. Will work on both latex and oil-based paints, lacquers and varnishes.

c. Cling well to round or vertical surfaces.

d. Form an anti-evaporative film as they dry.

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e. Clean-up by either washing or scraping off. All traces must be removed and a neutral pH achieved before repainting.

f. Use if milder formulations are not effective.

B. Chemical Rust Removers, manufacturer’s standard phosphoric acid-based gel formulations for removing corrosion from iron and steel.

C. Cornstarch or fumed silica to further thicken chemicals so they will adhere to vertical surfaces.

D. Liquid Strippable Masking Agent: Manufacturer’s standard liquid, film forming, strippable masking material for protecting glass and polished stone surfaces from damaging effect of acidic and alkaline cleaners, such as “Sure Klean Acid Stop (ProSoCo, Inc), or approved equal.

E. Mineral Spirits (To remove chemical residue)

1. A petroleum distillate that is used especially as a paint or varnish thinner.

2. Other chemical or common names include “Benzine” (not Bezene), “Naptha”, “Petroleum spirits” and “Solvent naptha”.

3. Safety Precautions – material is toxic and flammable.

a. Avoid repeated or prolonged skin contact.

b. Always wear rubber gloves when handling mineral spirits.

c. If any chemical is splashed onto the skin, wash immediately with soap and water.

F. Phenolphthalein: Used to test pH of a surface after stripping with chemicals or any alkaline product.

G. Trisodium Phosphate (TSP) Substitute: TSP is prohibited in some areas and so TSP Substitute shall alternatively be used.

1. TSP Substitute products include “Klean-Strip 0408 Trisodium

Phosphate Substitute – No Rinse (Prosoco, Inc) or approved equal and water-based solutions containing baking soda or borax.

H. Primer:

1. Primary function is adhesion, must bond well to substrate and intermediate coat.

2. Shall have enough chemical and weather resistance to protect the substrate before application of next coat.

3. Shall be compatible with intermediate and top coats.

4. Shall be compatible with paint/rust removal methods.

5. Comply with manufacturer’s written instructions for cleaning, pretreatment application, and minimum dry thickness.

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6. See Section 09 91 00 PAINTING and Material Schedules in the drawings for specified primers for specific applications.

I. Paint:

1. Must be compatible with primer.

2. Intermediate coat shall uniformly bond the primer with top coat.

3. Intermediate coat shall have enough chemical and weather resistance to protect the primer and substrate.

4. Must have good resistance to degradation from ultraviolet light.

5. Must be suitable for exterior use.

6. See Section 09 91 00 PAINTING and Material Schedules in the drawings for specified paints for specific applications.

J. Fasteners: Fasteners shall be of the same basic metal and with finish as fastened metal unless otherwise indicated.

PART 3 - EXECUTION

3.1 PREPARATION

A. Protection for paint removal:

1. Comply with recommendations of manufacturers of chemical cleaners for protecting building surfaces, vegetation and storm sewers from exposure to their products.

2. Protect all adjacent materials, especially glass, unpainted metal trim and polished stone, from contact with acidic chemical cleaners by covering them with liquid strippable masking agent or polyethylene film and waterproof masking tape. Apply masking agent to comply with manufacturer’s recommendations. Do not apply masking agent to painted or porous surfaces.

3. Protect adjacent surfaces from damage by splashing or run off that may contain cleaning or stripping products as well as paint, finishing and soiling removed from treated surfaces, including grass, shrubs and trees with paper, drop cloths and other means. Items not to be painted which are in contact with or adjacent to painted surfaces shall be removed or protected prior to surface preparation and painting operations.

4. All waste material shall be collected at the end of each work day and properly disposed of. It is considered hazardous waste.

5. Work area shall be sealed to prevent the spread of dust and debris beyond the work site.

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6. If vacuums are used to clean area, machines shall be equipped with

HEPA (High Efficiency Particulate Air) filters to ensure all lead dust has been contained and removed.

B. Test mildest, most environmentally benign formulations first before proceeding to stronger chemicals and harsher methods.

C. Wrought iron, cast iron and steel metals shall be repainted immediately following paint removal in order to prevent exposure to the atmosphere and subsequent corrosion.

D. Comply with each manufacturer’s written instructions for protecting building and other surfaces against damage from exposure to its products.

E. Do not apply chemical solutions during winds of enough force to spread them to unprotected surfaces.

F. Neutralize alkaline and acid wastes before disposal.

G. Dispose of runoff from operations by legal means and in a manner that prevents soil erosion, undermining of paving and foundations, damage to landscaping, and water penetration into building interiors.

3.2 PREPARATORY CLEANING

A. Perform preparatory cleaning before performing repair work. Use only those methods indicated for each type of decorative formed metal and its location.

1. If using wire brushes, use brushes of same base metal composition as metal being treated. Use brushes that are resistant to chemicals being used.

2. Use spray equipment that provides controlled application at volume and pressure indicated, measured at nozzle. Adjust pressure and volume to ensure that spray methods do not damage surfaces.

a. Equip units with pressure gages.

b. For water-spray application, use fan-shaped spray that disperses water at an angle of 25 to 50 degrees.

c. For high-pressure water-spray application, use fan-shaped spray that disperses water at an angle of at least 40 degrees.

d. For heated water-spray application, use equipment capable of maintaining temperature between 140 and 160 deg F at flow rates indicated.

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3. Perform each cleaning method in a manner that results in uniform coverage of all surfaces, including corners, contours, and interstices, and that produces an even effect without streaks or damaging surfaces.

B. Water Cleaning: Clean with water applied with sponges or wash cloths, supplemented with natural fiber bristle brush. Use small brushes to remove soil and loose paint from joints and crevices.

C. Detergent Cleaning:

1. Wet surface with water applied with sponges, wash cloths or low-pressure spray.

2. Scrub surface with detergent solution and natural fiber bristle brush until soil is thoroughly dislodged and can be removed by rinsing.

Use small brushes to remove soil and loose paint from joints and crevices. Dip brush in solution often to ensure that adequate fresh detergent is used and that surface remains wet.

3. Rince with water applied with sponges, wash cloths or low-pressure spray to remove detergent solution, soil and loose paint.

3.3 ERECTION, INSTALLATION, APPLICATION

A. Chemical Rust Removal.

1. Brush apply commercially available chemical rust removers and allow to dwell according to manufacturer’s instructions.

2. Do not use hydrochloric acid based products as they may lead to future corrosion.

3. Wipe off residue with mineral spirits and either steel wool or soft rags.

4. Dry immediately with clean soft cloths or using an industrial blow dryer. Follow direction of grain in metal. Do not touch cleaned ornamental metal surface.

5. Prime immediately to prevent rust.

B. Clean small pieces which can be removed.

1. Remove only as much paint and rust each day as can be primed that same day. Bare iron and steel will begin to rust again within a matter of hours. It shall not be allowed to sit unprotected overnight.

2. Soak in a solution of hot water and TSP-Substitute or sudsy ammonia to loosen the paint.

3. Remove paint with scrapers and/or a wire brush.

4. A final wipe down with mineral spirits may be necessary to help remove final traces of paint.

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5. Dry immediately and prime to prevent rusting. A heat gun, set at the lowest temperature, can be used to hasten the drying time. Do not use high heat as this may distort the metal members.

C. Remove any loose paint not already removed with the rust using a chemical paint remover.

1. If the paint is adhering soundly leave it alone – it provides extra protection. Feather the edges of these areas to provide a smooth finish and appearance.

2. Brush the chemical onto the surface in the amount recommended by the manufacturer. Thicken if necessary with cornstarch or fumed silica.

3. Cover with plastic and allow to site or “dwell” according to manufacturer’s instructions.

4. Remove sludge using scrappers and steel wool. A second application may be required on those areas where paint is especially thick or the detail is intricate.

5. After removal has been completed using chemicals rub all surfaces down with mineral spirits to remove all traces of chemical and waxy residue.

a. Test whether all chemicals have been removed and a neutral pH achieved by dissolving a 2” piece of phenolphthalein in denatured alcohol.

b. Brush the solution onto the surface. If it turns a shade from pink to magenta there is still chemical residue.

c. Treat the surface with additional mineral spirits and continue testing until there is no color change in the phenolphthalein solution.

6. Dry thoroughly and prime immediately to prevent rust.

7. Paint all surfaces.

D. Repair all failed welded connections at Rostrum wrought iron stair railings.

1. Comply with AWS for recommended practices in welding. Provide welds hidden from finished surfaces without distorting or discoloring exposed side. Clean exposed welded joints of flux, and dress exposed and contact surfaces.

a. Use materials and methods that match color of base metal, minimize distortion, and develop maximum strength and corrosion resistance.

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b. Remove flux immediately.

c. At exposed connections, match contours of adjoining surfaces, and finish exposed surfaces smooth and blended so no roughness shows after finishing.

E. Provide rebates, lugs, and brackets necessary to reinstall components and attach to existing work. Drill and tap for fasteners. Use concealed fasteners where possible; use exposed fasteners to match existing work.

3.4 HISTORIC DECORATIVE FORMED METAL REPAIR, GENERAL

A. Repair Appearance Standard: Repaired surfaces are to have a uniform appearance as viewed from 20 feet away by VA COR.

B. In repairing historic items (existing handrails and guardrails), disturb remaining work as minimally as possible and as follows:

1. Stabilize decorative formed metal to reestablish structural integrity and weather resistance while maintaining the existing form of each item.

2. Remove deteriorated coatings and corrosion.

3. Sequence work to minimize time before protective coatings are reapplied.

4. Repair items in place unless otherwise indicated and retain as much original material as possible. Handrails at Administration Building will be removed for refinishing work while stucco replacement is occurring.

C. Do not use abrasive methods such as sanding or power tools unless as part of the historic treatment program and approved by the VA COR.

D. Repairing Decorative Formed Metal: Match existing materials and features, retaining as much original material as possible to complete the repair.

1. Repair decorative formed metals by straightening, patching, piecing-in, splicing, welding or otherwise reinforcing metals with new metal, matching existing metal, form and texture. Match existing method of connection where connections are being repaired.

2. Deformed components: flatten bent and deformed components so that full length of component’s edges will again nest tightly against adjacent work insofar as practicable.

3.5 CLEAN AND PROTECTION

A. Protect refinished decorative metal components from damage until completion of the project.

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B. At completion of installation, touch up and restore damaged or defaced finish surfaces and fastener heads.

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