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Historic Preservation - Technical Procedures

Spectitle:
General Guidelines For Cutting And Patching

Procedure code:
0104501S

Source:
Federal Bldg/Uspo/Spokane, Wa - Gsa/Pbs

Division:
General Requirements

Section:
Cutting And Patching

Last Modified:
02/24/2012

Details:
General Guidelines For Cutting And Patching



GENERAL GUIDELINES FOR CUTTING AND PATCHING ORIGINAL WORK PART 1---GENERAL 1.01 SUMMARY     A.   This procedure includes general guidelines to follow when          performing cutting and patching original work. 1.02 DEFINITIONS     A.   "Cutting and patching" includes cutting into existing          construction to provide for the installation or          performance of other work and subsequent fitting and          patching required to restore surfaces to their original          condition.          1.   Cutting and patching is performed for coordination               of the work, to uncover work for access or               inspection, to obtain samples for testing, to               permit alterations to be performed or for other               similar purposes.          2.   Cutting and patching performed during the               manufacture of products, or during the initial               fabrication, erection or installation processes is               not considered to be "cutting and patching" under               this definition. Drilling of holes to install               fasteners and similar operations are also not               considered to be "cutting and patching".          3.   "Selective Demolition" is recognized as               related-but-separate category of work, which may or               may not require cutting and patching as defined in               this procedure. l.03 SUBMITTALS     A.   Procedural Proposal for Cutting and Patching: Where prior          approval of cutting and patching is required, submit          proposed procedures for this work well in advance of the          time work will be performed and request approval to          proceed. Include the following information, as          applicable, in the submittal:          l.   Describe nature of the work and how it is to be               performed, indicating why cutting and patching               cannot be avoided. Describe anticipated results of               the work in terms of changes to existing work,               including structural, operational and visual               changes as well as other significant elements.          2.   List products to be used and firms including their               qualifications, that will perform work.          3.   Give dates when work is expected to be performed.          4.   List utilities that will be disturbed or otherwise               be affected by work, including those that will be               relocated and those that will be out-of-service               temporarily. Indicate how long utility service will               be disrupted.          5.   When cutting and patching of structural work               involves the addition of reinforcement, submit               details and engineering calculations to show how               that reinforcement is integrated with original               structure to satisfy requirements.          6.   Indicate changes to designated landmark areas or               highly rated HBPP zones.          7.   All welding and/or hotwork requires formal               notification to the Building Manager no later than               the first thing in the morning of each day such               work is to be done.  No welding or hot work is               permitted without such prior notification. l.04 QUALITY ASSURANCE     A.   General Contractor shall do all cutting and patching of          wall and ceiling surface for the removal, relocation of          or new piping, conduit, electrical boxes, asbestos          abatement, PCB removal, and where pipes have been removed          or abandoned.          1.   Cutting which will disturb the asbestos material               shall be done under the direction of the Asbestos               Abatement subcontractor.     B.   Cutting and patching of all nonstructural concrete floors          for Mechanical and Electrical work shall be done by the          respective subcontractors in accordance with the          provision of this section.     C.   Cutting and patching of all walls for ducts shall be done          by the Mechanical subcontractor in accordance with the          provisions of this section.     D.   Requirements for Structural Work: Do not cut and patch          structural work in a manner that would result in a          reduction of load-carrying capacity or of load-deflection          ratio. Prior to such work, obtain approval of project's          Structural Engineer.     E.   Before cutting and patching the following categories of          work, obtain the Contracting Officer's and Regional          Historic Preservation Officer s (RHPO) approval to          proceed.          l.   Structural steel.          2.   Miscellaneous structural metals, including lintels,               equipment supports, stair systems and similar               categories of work.          3.   Structural concrete.          4.   Foundation construction.          5.   Timber and primary wood framing.          6.   Structural decking.          7.   Bearing and retaining walls.          8.   Piping, ductwork, vessels and equipment.          9.   Shoring, bracing, and sheeting.          10.  Primary operational systems and equipment.          11.  Water/moisture/vapor/air/smoke barriers, membranes               and flashings.          l2.  Noise and vibration control elements and systems.          l3.  Control, communication, conveying, and electrical               wiring systems.     F.   Visual Requirements: Do not cut and patch work exposed on          the building's exterior or in its occupied spaces, in a          manner that would, in the Contracting Officer's opinion,          result in lessening the building's aesthetic qualities.          Do not cut and patch work in a manner that would result          in substantial visual evidence of cut and patch work.          Remove and replace work judged by the Contracting Officer          to be cut and patched in a visually unsatisfactory          manner.     G.   Retain a recognized experienced and specialized firm to          cut and patch the following categories of exposed work.          1.   Processed concrete finishes.          2.   Stonework and stone masonry.          3.   Ornamental metal.          4.   Matched-veneer woodwork.          5.   Roofing.          6.   Stucco and ornamental plaster.          7.   Terrazzo.          8.   Finished wood flooring.          9.   Carpeting.          l0.  Wall covering.          ll.  HVAC enclosures, cabinets or covers. PART 2---PRODUCTS 2.0l MATERIALS     A.   General: Except as otherwise indicated, or as directed by          the Contracting Officer, use materials for cutting and          patching that are identical to existing materials. If          identical materials are not available, or cannot be used,          use materials that match existing adjacent surfaces to          the fullest extent possible with regard to visual effect.          Use materials for cutting and patching that will result          in equal-or-better performance characteristics.          l.   The use of a trade name and suppliers name and               address is to indicate a possible source of the               product. Products of the same type from other               sources shall not be excluded provided they possess               like physical and functional characteristics. PART 3---EXECUTION 3.0l EXAMINATION     A.   Before cutting, examine the surfaces to be cut and          patched and the conditions under which the work is to be          performed. If unsafe or otherwise unsatisfactory          conditions are encountered, take corrective action before          proceeding with the work.          1.   Before the start of cutting work, meet at the work               site with all parties involved in cutting and               patching, including mechanical and electrical               trades. Review areas of potential interference and               conflict between the various trades. Coordinate               layout of the work and resolve potential conflicts               before proceeding with the work. 3.02 PREPARATION     A.   Temporary Support: To prevent failure provide temporary          support of work to be cut.  Do not endanger other work.          Provide adequate protection of other work during cutting          and patching, to prevent damage; and provide protection          of the work from adverse weather exposure.     B.   Protection: Protect other work during cutting and          patching to prevent damage. Provide protection from          adverse weather conditions of that part of the project          that may be exposed during cutting and patching          operations.          l.   Avoid interference with use of adjoining areas or               interruption of free passage to adjoining areas. 3.03 ERECTION, INSTALLATION, APPLICATION     A.   General: Employ skilled workers to perform cutting and          patching work. Except as otherwise indicated or as          approved by the Contracting Officer, proceed with cutting          and patching at the earliest feasible time and complete          work without delay.     B.   Cutting: Cut the work using methods that are least likely          to damage work to be retained or adjoining work.          l.   In general, where cutting is required use hand or               small power tools designed for sawing or grinding,               not hammering and chopping. Cut through concrete               and masonry using a cutting machine such as a               Carborundum saw or core drill to insure a neat               hole.          2.   Cut holes and slots neatly to size required with               minimum disturbance of adjacent work. To avoid               marring existing finished surfaces, cut or drill               from the exposed or finished side into concealed               surfaces. Temporarily cover openings when not in               use.          3.   Comply with other applicable requirements where               cutting and patching requires excavating and               backfilling.          4.   By-pass utility services such as pipe and conduit,               before cutting, where such utility services are               shown or required to be removed, relocated or               abandoned. Cut-off conduit and pipe in walls or               partitions to be removed. After by-pass and               cutting, cap, valve or plug and seal tight               remaining portion of pipe and conduit to prevent               entrance of moisture or other foreign matter.     C.   Patching: Patch with seams which are durable and as          invisible as possible. Comply with specified tolerances          for the work.          l.   Where feasible, inspect and test patched areas to               demonstrate integrity of work.          2.   Restore exposed finishes of patched areas and where               necessary extend finish restoration into retained               adjoining work in a manner which will eliminate               evidence of patching and refinishing.  Where patch               occurs in a smooth painted surface, extend final               paint coat over entire unbroken surface containing               patch, after patched area has received prime and               base coats.          3.   Where removal of walls or partitions extends one               finished area into another finished area, patch and               repair floor and wall surfaces in the new space to               provide an even surface of uniform color and               appearance. If necessary to achieve uniform color               and appearance, remove existing floor and wall               coverings and replace with new materials.               a.   Where patch occurs in a smooth painted                    surface, extend final paint coat over entire                    unbroken surface containing patch, after                    patched area has received prime and base coat.          4.   Patch, repair or rehang existing ceilings as               necessary to provide an even plane surface of               uniform appearance. 3.04 ADJUSTING/CLEANING     A.   Thoroughly clean areas and adjacent spaces soiled due to          the work performed or used as access to work. Remove          completely paint, mortar, oils, putty and items of          similar nature. Thoroughly clean piping, conduit and          similar features before painting or other finishing is          applied. Restore damaged pipe covering to its original          condition.                             END OF SECTION