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Historic Preservation - Technical Procedures
General Guidelines For Cutting And Patching
Federal Bldg/Uspo/Spokane, Wa - Gsa/Pbs
Cutting And Patching
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