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Historic Preservation - Technical Procedures

Spectitle:

General Project Guidelines

Procedure code:

0110007S

Source:


Division:

General Requirements

Section:

Special Project Procedures

Last Modified:

02/24/2012

Details:

General Project Guidelines



GENERAL PROJECT GUIDELINES


THIS STANDARD INCLUDES GENERAL PROJECT GUIDELINES PROVIDED TO
SUPPLEMENT SPECIFIC REPAIR AND PREVENTIVE MAINTENANCE PROCEDURES.
NOT ALL OF THESE REQUIREMENTS WILL BE APPLICABLE GIVEN THE LEVEL OF
DIFFICULTY OF THE PROCEDURE.  HOWEVER, WHERE APPLICABLE, THESE
GUIDELINES SHOULD BE USED IN ADDITION TO RECOMMENDATIONS PROVIDED
BY THE REGIONAL HISTORIC PRESERVATION OFFICER (RHPO).  THE
INFORMATION IS LISTED IN THE ORDER IT MIGHT APPEAR IN THE USUAL CSI
SECTION FORMAT.


SAFETY PRECAUTIONS

-    The supervisor should ensure that all workers wear adequate,
    approved protective clothing and are provided with protective
    equipment during work operations and as required at other
    times.

-    Check manufacturer's literature for precautions and effects of
    products and procedures on adjacent building materials,
    components, and especially vegetation.  Take appropriate
    protective measures.

-    All workers must be protected from the effects of chemicals
    during repair or cleaning operations.

    1.   DO NOT save unused portions of stain-removal materials.

    2.   DO NOT store any chemicals in unmarked containers.

    3.   EXCELLENT VENTILATION MUST BE PROVIDED WHEREVER ANY
         SOLVENT IS USED.  USE RESPIRATORS WITH SOLVENT FILTERS.

         NOTE:  SOME OF THE SOLVENTS LISTED COULD BE KNOWN
         CARCINOGENS AND MAY BE BANNED IN SOME STATES.

    4.   No use of organic solvents indoors should be allowed
         without substantial air movement.  Use only spark-proof
         fans near operations involving flammable liquids.

    5.   Provide adequate clothing and protective gear where the
         chemicals are indicated to be dangerous.

    6.   Have available antidote and accident treatment chemicals
         where noted.

    7.   Avoid skin contact and inhalation of any chemical.
         Rubber or plastic gloves should be worn when handling
         hazardous (flammable or toxic) chemicals.

         a.   Follow storage and handling procedures printed on
              the container labels of the cleaning solutions,
              provide good ventilation while working, and
              thoroughly wash hands after completion of the work.

         b.   Provide protective clothing which must be worn and
              protective creams for exposed skin areas.

         c.   Accidental contact with unprotected skin to these
              materials must be treated immediately by washing
              with soap and water, never with solvents.  

         d.   Exercise care to avoid skin contact to tool
              cleaning solvents and to provide adequate
              ventilation for clean-up operations.

-    When removing bird droppings:  Bird droppings may expose
    workers to the effects of cryptococcosis and histoplasmosis
    which endanger the human respiratory system.  Public health
    authorities should be consulted for appropriate precautions.

    1.   All contractor personnel must wear a National Institute
         for Occupational Safety and Health (NIOSH) approved full
         face respirator with a high efficiency particulate air
         (HEPA) filter for screening particles of 0.3 micron size.
         Dust and particle masks are not appropriate.

    2.   Respirators must be used in accordance with OSHA
         regulation, 29 CFR 1910.134 and GSA policy, PBS P
         5900.2C, Chapter 3, section 8.  This includes fit-testing
         of respirators, maintenance, training, and storage
         requirements.

    3.   All contractor personnel must wear protective coveralls,
         gloves, boots, and hats.

    4.   Prior to removal, all excrement must be saturated with
         water under low pressure to prevent debris from becoming
         airborne.

    5.   On historic structures, only non-metallic tools (such as
         plastic spatulas and brushes with natural fiber or nylon
         bristles, or their equivalent) must be used to remove the
         excrement.

    6.   Removed excrement must be collected in plastic bags,
         sealed, and disposed of by the contractor at a sanitary
         landfill.

    7.   All work must be performed from the outside of the
         building.  Building occupants and the general public must
         be kept clear of the work site during all operations.  It
         is the contractor's responsibility to provide all
         barricades, signage, etc. necessary for public
         protection.

-    When removing paint:

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

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

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

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

    5.   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.


HISTORIC STRUCTURES PRECAUTIONS

-    The principal aim of any work must be to halt the process of
    deterioration and stabilize the item's condition.  Repair is
    a second option which becomes necessary only where
    preservation is not sufficient to ensure mid- to long-term
    survival.  Repair should always be based on the fundamental
    principle of 'minimal disturbance'.  The following are good
    practices which arise from this principle:

    1.   Retention of as much existing material as possible;
         repairing and consolidating rather than renewing.

    2.   The use of additional material or structure to reinforce,
         strengthen, prop, tie, and/or support existing material
         or structure.

    3.   The use of reversible processes wherever possible.

    4.   The use of traditional materials and techniques.  New
         work should be distinguishable to the trained eye, on
         close inspection, from the old.

    5.   The item should be recorded before, during and after the
         work.

-    No smoking will be allowed by personnel performing work on or
    about Historic Structures.

-    RHPO's approval is required for any change, addition or
    removal of historic structural fabric or historic property.

-    RHPO should be notified of any visible change in the integrity
    of the material or component whether environmental, such as
    biological attack, ultraviolet degradation, freeze, thaw,
    etc., or structural defects, such as cracks, movement, or
    distortion.

-    Architectural features will be repaired rather than replaced
    wherever possible.  Repair or replacement of missing features
    will be based on accurate duplications rather than on
    conjectural designs.

-    Work which requires existing features to be removed, cleaned
    and reused shall be accomplished without damage to the
    material itself, to adjacent materials, or the substrate.

-    Existing features removed from the building which are to be
    reinstalled shall be carefully labeled and stored within the
    building in a place where they will not be damaged or obstruct
    other work.

-    New or replacement materials/features will be permanently
    marked in an unobtrusive manner to distinguish them from
    original fabric.  The manner of identification and location of
    these marks shall be recorded in permanent building records.

-    Identify the historic importance of the material or feature.
    The item's merit, in terms of age, uniqueness of design,
    materials, size, technological development, association with
    persons or events, exceptional workmanship or design
    qualities, must be understood before decisions regarding
    repair, maintenance and preservation can be made.  

-    Statement of Non-Compliance:  Wherever it is necessary to
    proceed with the use of products, under conditions which do
    not comply with the requirements (because of time schedule
    difficulties or other reasons which the supervisor determines
    that are crucial to the project), prepare a written statement
    for the RHPO's Record indicating the nature of the non-compliance, the reasons for
proceeding, the extra or
    precautionary measures taken to ensure the best possible work,
    and the names of the individuals concurring with the decisions
    to proceed with the work.

-    When cleaning, avoid overcleaning.  Aim for achieving 85%
    clean.  Most damage occurs when attempting to clean the last
    15%.

    1.   Do not use acids or flame tools to strip paint from
         stone, as it will damage the surface.

    2.   Do not use steel or metal spatulas or tools to scrape
         stone because of the likelihood of scratching, chipping,
         gouging, or otherwise marring the surface.


SUBMITTALS

-    Product Data (when applicable):  

    1.   Submit to RHPO manufacturer's technical data for each
         product indicated including chemical analysis,
         recommendations for their application and use, and any
         other available technical data.  Include test reports and
         certifications substantiating that products comply with
         requirements.

    2.   MANUFACTURERS OFFERING OTHER THAN BRAND NAME ITEMS
         IDENTIFIED IN THE PROCEDURE SHOULD FURNISH ADEQUATE
         INFORMATION TO ENSURE THAT A DETERMINATION CAN BE MADE AS
         TO EQUALITY OF THE PRODUCT(S) OFFERED (SEE THE CLAUSE
         ENTITLED BRAND NAME OR EQUAL SET FORTH IN SECTION
         552.210-74 OF THE GSA ACQUISITION REGULATION).

-    Samples:

    1.   Clearly labelled samples of all materials to be used on
         the job should be submitted to the RHPO for approval
         before work starts.

    2.   The approved samples will become the standard materials
         used on the job.  Substitutions will not be permitted
         without written approval from the RHPO.

-    Quality Control Submittals:  

    1.   Submit written program for each phase of process
         including protection of surrounding materials during
         operations.  Describe in detail materials, methods and
         equipment to be used for each phase of work.

    2.   If alternative methods and materials to those indicated
         are proposed for any phase of work, provide written
         description to RHPO, including evidence of successful use
         on other, comparable projects, and program of testing to
         demonstrate effectiveness for use on this project.

    3.   The contractor should supply proof of work on this type
         of project by submitting a list of pertinent projects the
         subcontractor has worked on which includes the scope of
         work, the budget for the scope of work, and a way to
         contact the owner and architect of each project.

-    Design Data/Test Reports/Certificates:

    1.   Routine testing of proposed materials, and of final work
         for compliance with the procedure will be carried out by
         the RHPO or his\her appointed representative.

         a.   Cleaning methods should be tested prior to
              selecting the one for use.  The simplest and least
              aggressive method(s) should be selected.

         b.   The level of cleanliness desired also should be
              determined.  A like-new appearance is both
              inappropriate and requires an overly harsh cleaning
              method.

    2.   If test results show that performance criteria are not
         met, removal and repair of rejected work should be
         performed.




QUALITY ASSURANCE

-    Qualifications:

    1.   Restoration Specialist:  Work must be performed by a firm
         having not less than five years successful experience in
         comparable projects and employing personnel skilled in
         the processes and operations indicated.  Project
         supervisor must have five years experience in work
         similar to this procedure.  Additional personnel must
         also have experience.

    2.   A supervisory craftsperson will be present when a
         craftsperson begins to perform the work in order to
         explain any procedures.  Any modification of the written
         procedures will be made at that time.  

    3.   The supervisory craftsperson shall also be present during
         the work to instruct personnel as required.

-    Source of Materials:  Obtain materials from a single source
    for each type material required.

-    Regulatory Requirements:  

    1.   Engage an approved independent testing laboratory to
         examine materials prior to use and continuously inspect
         the work for compliance with this procedure and any
         related documents.

    2.   The required research report and manufacturer's data
         shall be at the site and used for reference.

    3.   Conform with all applicable safety guidelines.

    4.   For Cleaning:  Comply with municipal and Federal
         regulations governing cleaning, chemical waste disposal,
         scaffolding and protection of adjacent surfaces.

-    Mock-ups:  After acceptance of the list of materials and
    proposed method of cleaning, repair or refinishing, a
    representative sample area shall be cleaned, repaired or
    refinished as specified.

    1.   Employ the method proposed and accepted for use.  Obtain
         acceptance of the sample area from the RHPO before
         proceeding with remainder of the procedure.  

    2.   Maintain the sample area in its accepted condition until
         final acceptance of the completed work.  Manufacturer's
         Representative should be present during mock-up and its
         inspection for approval.  Sample work should be preformed
         in an area approved by the RHPO.  

    3.   A SMALLER TEST FOR EACH PRODUCT SHOULD BE DONE ON EACH
         MATERIAL IN AN INCONSPICUOUS AREA TO CHECK FOR ADVERSE
         EFFECTS AND DAMAGE TO THE MATERIAL.

-    For Cleaning:

    1.   Before cleaning, all drains to be used should be tested
         to ensure they are functioning properly.  Any clogged
         drains should be reported immediately.

    2.   During cleaning, prevent cleaning residue from entering
         the drains or drain lines.  Drains or drain lines that
         become blocked with cleaner residue must be cleaned out
         immediately.


DELIVERY, STORAGE AND HANDLING

-    Packing and Shipping:  Deliver materials to site in
    manufacturer's original and unopened containers and packaging,
    bearing labels as to type and names of products and
    manufacturers.

-    Acceptance at Site:  Handle materials in accordance with
    project safety guidelines and manufacturer's recommendations.

-    Storage and Protection:

    1.   Every effort must be made to use and reuse materials that
         are original to the structure.  When removed from their
         rightful place, these materials must be stored under
         cover inside the building where they cannot be damaged.

    2.   When pieces are to be removed, mark pieces
         inconspicuously in a consistent manner as to their
         original location.  Document original position and label
         accordingly.

    3.   If salvage material is to be used, treat it as new or
         original material with regard to its storage.

    4.   Protect all materials during storage and construction
         from wetting by rain, snow or ground water, and from
         intermixture with earth or other types of materials.

    5.   Protect materials from deterioration by moisture and
         temperature.  

         a.   Store cementitious materials off ground, under
              cover and in a dry location.  Protect liquid
              components from freezing.  

         b.   Comply with manufacturer's recommendations for
              minimum and maximum temperature requirements for
              storage.

         c.   Store all chemicals in metal cabinets.  No cans
              shall be left open or out of the cabinet overnight.


PROJECT/SITE CONDITIONS

-    Environmental Requirements:

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

    2.   Wet weather:  Do not attempt repairing of feature in
         raining or foggy weather.  Do not apply primer, paint,
         putty, or epoxy when the relative humidity is above 80%.
         Do not remove exterior elements of structures when rain
         is in the forecast or in progress.

    3.   Work in the shade when the temperature is above 75oF.
         Work around the structure in the shade away from the sun.

    4.   Do not perform exterior wet work when the air temperature
         is below 40oF.

    5.   NEVER begin cleaning, patching, etc. when there is any
         likelihood of frost or freezing.

    6.   If cleaning is done in very hot, sunny weather, the
         feature/area should be shielded from excessive heat by
         hanging protective netting or tarpaulins around it.

    7.   No cleaning shall be executed when either the air or the
         masonry surface temperature is below 45  F, unless
         adequate, approved means are provided for maintaining a
         45  F temperature of the air and materials during, and
         for 48 hours subsequent to, cleaning.

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

    9.   Hot weather maximum application temperatures:

         a.   paint - 85oF
         b.   putty - 80oF
         c.   epoxy - 80oF

    10.  Cold weather minimum application temperatures:

         a.   paint - 50oF
         b.   putty - 50oF
         c.   epoxy - 55oF

-    Existing Conditions:  Check manufacturer's literature for
    precautions and effects of products and procedures on adjacent
    building materials, components, and especially vegetation.

SEQUENCING AND SCHEDULING

-    Preventive Maintenance and Repair activities should be
    scheduled during appropriate environmental conditions to avoid
    weather related failures.

-    Submit a work schedule indicating the proposed timing and
    extent of the work.

-    Co-ordinate the work schedule with that of other trades on
    site.

-    When cyclical maintenance work requires the use of high
    ladders and other access equipment, perform as many work items
    as possible.


PROTECTION

-    Do not change sources or brands of materials during the course
    of the work.

-    All necessary precautions shall be taken to protect all parts
    of the building not being cleaned or repaired from effects of
    the work, including excessive amounts of water that should not
    be allowed to pond in any area.  Also provide protection as
    required to prevent damage to adjacent property.

-    Provide protection against the spread of dust, debris and
    water at or beyond the work area by suitable enclosures of
    sheeting and tarpaulins.

-    Provide masking or covering on adjacent surfaces and permanent
    equipment.  Secure coverings without the use of adhesive type
    tape or nails.  Impervious sheeting which produces
    condensation should not be used.

-    Prevent the entry of dust, debris and water into the building
    by sealing all openings.


-    Provide protection from water damage to building, structure,
    or building contents as required.

-    Protect all landscape work adjacent to or within maintenance
    work areas:

    1.   Provide plank barriers to protect tree trunks.  Bind
         spreading shrubs.

    2.   Covering should allow plants to breathe and should be
         removed at the end of each work day.  Do not cover plant
         material with a waterproof membrane for more than 8 hours
         at one time.

    3.   Set scaffolding and ladder legs away from plants.
         Pruning requests should be directed to the RHPO.

-    Test all drains and other water removal systems to assure that
    drains and systems are functioning properly prior to
    performing any cleaning operations. Notify Contracting Officer
    or designated representative immediately of any and all drains
    or systems that are found to be stopped or blocked. Contractor
    shall repair drains if so directed by the Contracting Officer
    or designated representative. Do not begin work of this
    Section until the drains are in working order.

-    Provide a method to prevent solids such as stone or mortar
    residue from entering the drains or drain lines. Contractor
    shall be responsible for cleaning out drains and drain lines
    that become blocked or filled by sand or any other solids
    because of work performed under this Contract.

-    Scaffolding, ladders and working platforms, required for the
    execution of this work should be provided.  These items should
    not be attached to the building.

                         END OF SECTION