013510 Historic Building Treatment Procedures.pdf

Robert C Weaver Federal Building, Granite Façade Repairs, Phase 2 Washington, DC Project Number # VDC00213

FY15 Update Oct. 1, 2014 Historic Building Treatment Procedures 013510 - 1

SECTION 013510 - HISTORIC BUILDING TREATMENT PROCEDURES

PART 1 - GENERAL

1.1 SUMMARY

A. Treatment procedures shall comply with the Department of the Interior’s Standards for Rehabilitation. This section includes special procedures for historic treatment on Project including, but not limited to, the following:

1. Storage and protection of existing historic materials.

2. Temporary protection of historic materials during construction.

3. Protection during application of chemicals.

4. Protection during use of heat-generating equipment.

5. Historic treatment procedures.

6. Removal of bird excrement.

7. Construction waste management.

B. The Government is providing the references included in this sub-section for information purposes only and is not intended to provide a comprehensive, all-inclusive list of any and all potentially relevant portions of the Contract Documents.

1. The Scope of Work, Section 2.6

2. Section 013200 "Construction Progress Documentation"

3. Section 013220 "Photographic Documentation"

4. Section 017310 “Cutting and Patching”

5. Section 017419 "Construction Waste Management and Disposal"

1.2 DEFINITIONS

A. "Preservation": To apply measures necessary to sustain the existing form, integrity, and materials of a historic property. Work may include preliminary measures to protect and stabilize the property.

B. "Rehabilitation": To make possible a compatible use for a property through repair, alterations, or additions while preserving those portions or features that convey its historical or cultural values.

C. "Restoration": To accurately depict the form, features, and character of a property as it appeared at a particular period of time by means of the removal of features from other periods in its history and the reconstruction of missing features from the restoration period.

D. "Reconstruction": To reproduce and match in the exact form and detail a building, structure, or artifact as it appeared at a specific period in time.

E. "Stabilize": To apply measures designed to reestablish a weather-resistant enclosure and the structural reinforcement of an item or portion of the building while maintaining the essential form as it exists at present.

F. "Protect and Maintain": To remove deteriorating corrosion, reapply protective coatings, and install protective measures such as temporary guards; to provide the least degree of intervention.

G. "Repair": To stabilize, consolidate, or conserve; to retain existing materials and features while employing as little new material as possible. Repair includes patching, piecing-in, splicing, consolidating, or otherwise reinforcing or upgrading materials. Repair includes limited replacement in kind, rehabilitation, and reconstruction, with compatible substitute materials for deteriorated or missing parts of features when there are surviving prototypes.

H. "Replace": To duplicate and replace entire features with new material in kind. Replacement includes the following conditions:

1. Duplication: Includes replacing elements damaged beyond repair or missing. Original material is indicated as the pattern for creating new duplicated elements.

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2. Replacement with New Materials: Includes replacement with new material when original material is not available as patterns for creating new duplicated elements.

3. Replacement with Substitute Materials: Includes replacement with compatible substitute materials. Substitute materials are not allowed, unless otherwise indicated.

I. "Remove": To detach items from existing construction and legally dispose of them off-site unless indicated to be removed and salvaged or removed and reinstalled.

J. "Remove and Salvage" or "Dismantle": To detach items from existing construction and deliver them to GSA ready for reuse. Items of interest or value to GSA that may be encountered during removal and dismantling work remain GSA's property. Carefully dismantle and salvage each item or object, and store in a manner that the items do not deteriorate.

K. "Remove and Reinstall": To detach items from existing construction, repair and clean them for reuse, and reinstall them where indicated.

L. "Existing to Remain" or "Retain": Existing items that are not to be removed.

M. “Match”: This means to blend with adjacent building fabric to appear identical to the original in terms of size, color, material, texture, finish, and if applicable method of attachment.

N. "Material in Kind": Material that matches existing materials, as much as possible, in species, cut, color, grain, finish and composition.

O. “Consolidate”: To strengthen loose or deteriorated materials in place.

P. “Stabilize”: To provide structural reinforcement of unsafe or deteriorated items while maintaining the essential form as it exists at present; also, to reestablish a weather-resistant enclosure.

Q. “Strip”: To remove existing finish strip down to base material unless otherwise indicated.

1.3 SUBMITTALS

A. Comply with applicable procedural requirements of Division 1 Sustainability Section 018111

1. Contractor must provide documentation for all materials.

2. If one of the sustainable procedures conflicts with preserving or retaining historic elements, that conflict shall be brought to the attention of the Contracting Officer and the GSA Preservation Staff by the contractor. Appropriate solutions shall be identified and an approach developed by relevant parties in order to meet both requirements as closely as possible.

B. Material Samples: For mock ups and in kind repair or replication of historic materials. Submit material samples showing accurate replication of historic material color, finish, form, detailing, texture, and other visual qualities.

C. Historic Treatment Program: Submit a written plan for each phase or process including storage of restoration materials and protection of surrounding materials during operations. Describe in detail materials, methods, and equipment to be used for each phase of work. Provide sequencing of work, and how the contractor will work with GSA to assure continuity of government operations and services during the work. Describe how the Contractor’s Preservation Construction Manager and other supervisory personnel will minimize the risks of adverse effects on historic materials and project delays resulting from unforeseen conditions or execution challenges. Historic Treatment Program must be approved by the Contracting Officer in conjunction with the GSA Preservation and Project staff prior to construction commencement in historic areas.

D. Alternative Methods and Materials: Alternative methods and materials to those indicated must be approved by the Contracting Officer and the GSA Preservation Staff. For any phase of work, provide a written description including evidence of successful use on other, comparable projects, and program of testing to demonstrate effectiveness for use on this Project.

E. Qualification Data: Reference 009000 and the Solicitation for the qualification requirements of the HTS. Qualification data shall be submitted to the Government as described therein.

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F. Photographs or Videos: Show existing conditions of adjoining construction and site improvements, including finish surfaces that might be misconstrued as damage caused by historic treatment operations. Submit before work begins.

G. Record Documents: Include modifications to manufacturer's written instructions and procedures, as documented in the historic treatment preconstruction conference and as the Work progresses.

1.4 QUALITY ASSURANCE

A. Historic Treatment Specialist (HTS) Qualifications: The HTS shall be employed by an experienced firm that is regularly engaged in historic treatments comparable in complexity and similar in nature, materials, design, and extent to this work as specified in the Contract (herein, Section 009000, and the Solicitation).

B. Field Supervisor Qualifications: Full-time supervisors shall be experienced in historic treatment work similar in nature, material, design, and extent to that indicated for this Project. Supervisors shall be on Project site during times that historic treatment work is in progress. Supervisors shall not be changed during Project except for causes beyond the control of the specialist firm.

C. Historic Treatment Preconstruction Conference: Conduct conference at Project site to comply with requirements in Division 1.

1. Review manufacturer's written instructions for precautions and effects of products and procedures on building materials, components, and vegetation. Record procedures established as a result of the review and distribute to affected parties.

2. Both field supervisor(s) and workers who will conduct the work will be present, and provide credentials to certify their qualifications to conduct the work

D. Mock-Ups: Prepare mock-ups to demonstrate historic treatment methods and/or cleaning procedures with respect to the compatibility of new work and quality standards of materials and execution. Prepare mock-ups so they are inconspicuous or reversible. Locate mock-ups on the building where directed by COTR and GSA Preservation staff in locations that enable viewing under same conditions as the completed Work.

1.5 STORAGE AND PROTECTION OF HISTORIC MATERIALS

A. Removed and Reinstalled Historic Materials:

1. Clean and repair historic items to functional condition adequate for intended reuse.

2. Pack or crate items after cleaning and repairing. Identify contents of containers.

3. Protect items from damage during transport and storage.

4. Store items in a secure area until reinstallation.

5. Reinstall items in locations indicated. Comply with installation requirements for new materials and equipment. Provide connections, supports, and miscellaneous materials necessary to make item functional for use indicated.

B. Existing Historic Materials to Remain: Protect construction indicated to remain against damage and soiling during historic treatment. When permitted by GSA, items may be removed to a suitable, protected storage location during historic treatment and cleaned and reinstalled in their original locations after historic treatment operations are complete.

C. Storage and Protection: When removed from their existing location, store historic materials within a weather-tight enclosure where they are protected from wetting by rain, snow, or ground water, and temperature variations. Secure stored materials to protect from theft. Identify removed items with an inconspicuous mark indicating their original location.

1.6 PROJECT SITE CONDITIONS

A. Exterior Cleaning and Repairing:

1. Proceed with the work only when forecasted weather conditions are favorable.

a. Wet Weather: Do not attempt repairs during rainy or foggy weather. Do not apply primer, paint, putty, or epoxy when the relative humidity is above 80 percent. Do not remove exterior elements of structures when rain is forecast or in progress.

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b. Do not perform exterior wet work when the air temperature is below 40 deg F.

c. Do not perform work requiring curing when there is any likelihood of frost or freezing within the curing period or unless approved protection measures are in place. Work damaged by frost or freezing will be removed and replaced at Contractor’s expense.

d. Do not begin cleaning, patching, or repairing when there is any likelihood of frost or freezing.

e. Do not begin cleaning when either the air or the surface temperature is below 45 deg F unless approved means are provided for maintaining a 45 deg F temperature of the air and materials during, and for 48 hours subsequent to, cleaning. Commence cleaning only during a rising thermometer.

2. Perform cleaning and rinsing of the exterior only during daylight hours.

B. GSA will occupy portions of building adjacent to historic treatment area. Conduct historic treatment so GSA's operations will not be disrupted. Provide not less than 72 hours' notice to GSA of activities that will affect GSA's operations.

PART 2 - PRODUCTS (not used)

PART 3 - EXECUTION

3.1 PROTECTION, GENERAL

A. Comply with manufacturer's written instructions for precautions and effects of products and procedures on adjacent building materials, components, and vegetation.

B. Ensure that supervisory personnel are present when work begins and during its progress.

C. Temporary Protection of Historic Materials during Construction:

1. Protect existing materials during installation of temporary protections and construction. Do not deface or remove existing materials.

2. Attachments of temporary protection to existing construction shall be approved by GSA prior to installation.

D. Protect landscape work adjacent to or within work areas as described in 015639, Tree & Plant Protection.

E. Existing Drains: Prior to the start of work or any cleaning operations, test drains and other water removal systems to ensure that drains and systems are functioning properly. Notify GSA immediately of drains or systems that are stopped or blocked. Do not begin Work of this Section until the drains are in working order.

1. Provide a method to prevent solids including stone or mortar residue from entering the drains or drain lines. Clean out drains and drain lines that become blocked or filled by sand or any other solids because of work performed under this Contract.

2. Protect storm drains from pollutants. Block drains or filter out sediments, allowing only clean water to pass.

3.2 PROTECTION DURING USE OF HEAT-GENERATING EQUIPMENT

Comply with the Division 1 Hot Work procedures. Before work with heat-generating equipment commences in historic work areas, furnish qualified personnel to serve as fire watch (or watches) for location(s) where work is to be performed.

3.3 HISTORIC TREATMENT PROCEDURES

A. Historic Treatment Program: Prepare a written plan for approval by the Government of historic treatment throughout the performance of the Work, including each phase or process and protection of surrounding materials during operations. Describe in detail materials, methods, and

FY15 Update Oct. 1, 2014 Historic Building Treatment Procedures 013510 - 5 equipment to be used for each phase of work. Show compliance with indicated methods and procedures specified in this and other Sections.

1. Dust and Noise Control: Include locations of proposed temporary dust- and noise-control partitions and means of egress from occupied areas coordinated with continuing on-site operations and other known work in progress.

2. Debris Hauling: Include plans clearly marked to show debris hauling routes, turning radii, and locations and details of temporary protective barriers.

B. Examination

1. Preparation for Removal and Dismantling: Examine construction to be removed or dismantled to determine best methods to safely and effectively perform removal and dismantling work. Examine adjacent work to determine what protective measures will be necessary. Make explorations, probes, and inquiries as necessary to determine condition of construction to be removed or dismantled and location of utilities and services to remain that may be hidden by construction that is to be removed or dismantled.

2. Verify that affected utilities have been disconnected and capped.

3. Inventory and record the condition of items to be removed and dismantled for reinstallation or salvage.

4. Before removal or dismantling of existing building elements that will be reproduced or duplicated in final Work, make permanent record of measurements, materials, and construction details required to make exact reproduction.

5. Engage a professional structural engineer to, in addition to other requirements noted elsewhere, survey condition of building to determine whether removing any element might result in structural deficiency or unplanned collapse of any portion of structure or adjacent structures as a result of removal and dismantling work.

C. Survey of Existing Conditions: Prior to commencement of any demolition or construction work, the Contractor shall electronically, graphically record all existing project conditions within the limits of work in sufficient detail to allow the Government to recreate the original project conditions after the conclusion of the project. This survey may include 3D cloud-point models, rendered 3D graphic models, photographic documentation, and written narratives describing the methods used to conduct this survey and describing the models and graphics derived as a result of this survey.

1. Comply with requirements specified in Division 01 Section "Photographic Documentation."

2. Perform surveys as the Work progresses to detect hazards resulting from historic treatment procedures

D. Mock-ups: Prepare mock-ups of specific historic treatment procedures specified in this Section to demonstrate the resulting appearance of treated areas and set quality standards for materials and execution.

1. Mock-ups shall include removal and dismantling work, bird excrement removal, and any of the restoration, preservation, reconstruction, and replacement efforts to be conducted for the project.

2. Ensure adequate curing time is allowed to show true finish condition prior to review.

Comply with manufacturer’s recommendations.

E. The principal aim of preservation work is to halt the process of deterioration and stabilize the item's condition. Repair is required where specifically indicated. The following procedures shall be followed:

1. Retain as much existing material as possible; repair and consolidate rather than replace.

2. Use additional material or structure to reinforce, strengthen, prop, tie, and support existing material or structure.

3. Use reversible processes wherever possible. This means that the preservation treatment can be undone to return to the condition before treatment commenced.

4. Use traditional replacement materials and techniques.

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5. Record the work before the procedure with preconstruction photos and during the work with periodic construction photos. Photographic documentation is specified in Division 1 Section "Construction Progress Documentation and Photographic Documentation."

F. Ensure that supervisory personnel are on-site and on duty when historic treatment work begins and during its progress.

G. Prohibit smoking by personnel performing work on or near historic building fabric.

H. Obtain GSA's review and written approval in the form of a Constructive Change Directive or Supplemental Instruction before making changes or additions to construction or removing historic materials.

I. Notify GSA of visible changes in the integrity of material or components whether due to environmental causes including biological attack, UV degradation, freezing, or thawing; or due to structural defects including cracks, movement, or distortion. Do not proceed with the work in question until directed by GSA.

J. Where missing features are indicated to be repaired or replaced, provide features whose designs are based on accurate duplications rather than on conjectural designs, subject to the approval of

GSA.

K. Where Work requires existing features to be removed, cleaned, and reused, perform these operations without damage to the material itself, to adjacent materials, or to the substrate.

L. Identify new or replacement materials and features with inconspicuous, permanent marks to distinguish them from original materials. Record the legend of identification marks and the locations of these marks on Record Drawings.

M. When cleaning, match samples of existing materials that have been cleaned and identified for acceptable cleaning levels. Avoid over-cleaning to prevent damage to existing materials.

N. Rinse thoroughly to prevent formation of subsurface salts or surface residue. Test damp surface with pH strip before and after cleaning to confirm that rinsing is complete.

O. Approved preservation, restoration, maintenance and cleaning procedures, including approved chemicals and products, can be found online under "GSA Technical Preservation Guidelines" (Go to www.gsa.gov/portal/content/101402).

P. Include cleaning methods and mock-ups and procedures for approval in the written Historic Treatment Plan.

3.4 PROTECTION DURING APPLICATION OF CHEMICALS

A. Comply with Division 1 requirements.

B. Protect motor vehicles, surrounding surfaces of building being restored, building site, plants, and surrounding buildings from harm or damage resulting from applications of chemical cleaners and paint removers.

C. Cover adjacent surfaces with protective materials that are proven to resist chemicals selected for Project unless chemicals being used will not damage adjacent surfaces as indicated in historic treatment program. Use covering materials and masking agents that are waterproof, UV-resistant, and will not stain or leave residue on surfaces to which they are applied. Apply protective materials according to manufacturer's written instructions. Do not apply liquid masking agents or adhesives to painted or porous surfaces. When no longer needed, promptly remove protective materials staining.

D. Do not apply chemicals during winds of sufficient force to spread them to unprotected surfaces.

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E. Neutralize and collect alkaline and acid wastes and legally dispose of off Owner's property.

F. Collect and dispose of runoff from chemical operations by legal means and in a manner that prevents soil contamination, soil erosion, undermining of paving and foundations, damage to landscaping, or water penetration into building interior.

END OF SECTION 013510