017310 Cutting and Patching.pdf

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

FY15 Update Oct. 1, 2014 Cutting & Patching 017310 - 1

SECTION 017310 - CUTTING AND PATCHING

PART 1 - GENERAL

1.1 SUMMARY

A. This section includes procedural requirements for cutting and patching in existing work.

B. Definition: Cutting and patching includes cutting into existing construction to provide for the installation or performance of other work and subsequent fitting and repair required to restore surfaces to their original condition. Drilling holes for fasteners and similar operations are not "cutting and patching".

C. Refer to other sections for other requirements and limitations applicable to cutting and patching individual parts of the Work.

D. Coordinate cutting and patching with demolition requirements as specified in section 017320 Selective Demolition.

E. Coordinate with section 017419 Construction Waste Management & Disposal requirements.

F. Coordinate with section 013510 Historic Building Treatment Procedures.

1.2 SUBMITTALS

A. Cutting and Patching Plan: In accordance with section 013300, submit a proposal to GSA's representative, describing procedures at least 14 calendar days in advance of the time cutting and patching will initially be performed.

1. Include the following information, as applicable:

a. Description of the extent of cutting and patching required. Show how it will be performed and indicate why it cannot be avoided.

b. Description of the anticipated results in terms of changes to existing construction.

Include changes to structural elements and operating components as well as changes in appearance and other significant visual elements.

c. List of products to be used and entities that will perform work.

d. Dates and hours of operation when cutting and patching will be performed.

e. 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.

f. Compatibility and cohesion characteristics of patching compounds with adjacent materials.

g. Details and engineering calculations showing integration of reinforcement with the original structure, where cutting and patching involve adding reinforcement to structural elements.

h. Temporary protection of existing structures, surfaces, finishes, equipment, etc. to remain in place during construction.

B. Approval by GSA to proceed with cutting and patching does not waive the right to later require complete removal and replacement of unsatisfactory work.

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C. Samples: Provide cutting and patching samples for the following items in order that special reviews and coordination can be arranged with approval authorities

1. Stonework

2. Architecturally finished concrete

1.3 QUALITY CONTROL

A. Requirements for Structural Work: Do not cut and patch structural elements in a manner that would change their load-carrying capacity or load-deflection ratio.

1. The cutting and patching plan shall include but not be necessarily be limited to work required at the following structural elements:

a. Bearing and retaining walls.

b. Structural concrete.

c. Miscellaneous structural metals.

B. Operational Limitations: Do not cut and patch operating elements, safety related systems, or related components in a manner that would result in reducing their capacity to perform as intended, or that would result in increased maintenance or decreased operational life or safety.

1. The cutting and patching plan shall include but not be limited to work required on the following operating elements or safety related systems:

a. Primary operational systems and equipment.

b. Air or smoke barriers.

c. Water, moisture, or vapor barriers.

d. Membranes and flashings.

e. Communication systems.

f. Electrical wiring systems.

g. Operating systems of other construction.

h. Intrusion detection systems.

i. Automated access control systems.

j. Internet, data and telephone lines.

C. Visual Requirements: Do not cut and patch construction exposed on the exterior or in occupied spaces in a manner that would, in GSA's opinion, reduce the building's aesthetic qualities. Do not cut and patch construction in a manner that would result in visual evidence of cutting and patching.

Remove and replace construction that is cut and patched in a visually unsatisfactorily manner.

1. If it is not possible to engage the original installer or fabricator, engage a Specialist who is specifically experienced in the work.

2. The cutting and patching plan shall include but not be limited to work required at the following visual elements:

a. Processed concrete finishes.

b. Stonework and stone masonry.

c. Ornamental metal.

d. Mechanical system enclosures, cabinets, and covers.

e. Historic building finishes.

1.4 EXISTING WARRANTIES

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A. Replace, patch, and repair material and surfaces cut or damaged by methods and with materials in such a manner as not to void any existing warranties.

PART 2 - PRODUCTS

2.1 MATERIALS

A. Use materials identical to existing materials to the maximum extent available.

B. For exposed surfaces, use materials that visually match existing adjacent surfaces to the fullest extent possible.

C. Use materials whose installed performance will equal or surpass that of existing materials.

D. Materials and/or products used in historic buildings must be approved by GSA Historic Preservation Staff.

PART 3 - EXECUTION

3.1 INSPECTION

A. Before cutting, examine surfaces to be cut and patched and conditions under which cutting and patching is to be performed. If unsafe or unsatisfactory conditions are encountered, take corrective action before proceeding.

B. Before proceeding with cutting and patching involving two or more trades, meet at the Project site with the entities providing or affected by the cutting and patching. Review areas of potential interference and conflict. Coordinate procedures and resolve potential conflicts before proceeding.

C. Before cutting areas of high historic integrity (i.e. Zones 1 & 2) as noted on the Historic Building Preservation Plan, these must be reviewed and approved by GSA Historic Preservation Staff.

3.2 PREPARATION

A. Provide temporary support of work to be cut. Temporary supports shall be inspected prior to work commencement.

B. Protect existing conditions during cutting and patching to prevent damage. Provide protection from adverse weather conditions for portions of the Project that might be exposed during cutting and patching operations. If work is being executed in a historic building then a historic treatment plan is required as specified in 013510 Historic Building Treatment Procedures

C. Avoid interference with use of adjoining areas or interruption of free passage to adjoining areas.

D. Bypass in-service existing pipe, conduit, or ductwork scheduled to be removed or relocated before cutting.

3.3 PERFORMANCE

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A. Employ skilled workmen to perform cutting and patching. Proceed with cutting and patching at the earliest feasible time and complete without delay. Any adverse noise or odor producing work must be performed in accordance with Section 011400 Work Restrictions.

B. Cutting: Cut existing construction using methods least likely to damage elements retained and adjoining construction. Where possible, review proposed procedures with the original installer and comply with the original installer's recommendations.

1. In general, use hand or small power tools designed for sawing or grinding, not for hammering and chopping.

2. Cut holes and slots as small as possible, neatly to size required, and with minimum disturbance of adjacent surfaces. Temporarily cover openings when not in use.

3. To avoid marring existing finished surfaces, cut or drill from the exposed or finished side into concealed surfaces.

4. Cut through concrete and masonry using silicon carbide or harder tipped tools.

5. Comply with requirements of applicable specification sections where cutting and patching requires excavating and backfilling.

6. After utility services are bypassed, cut-off pipe or conduit in walls or partitions to be removed. Cap, valve or plug and seal the remaining portion of pipe or conduit to prevent entrance of moisture or other foreign matter after by-passing and cutting.

C. Patching: Patch with durable seams that are as invisible as possible. Comply with specified tolerances.

1. Inspect and test patched areas to demonstrate integrity of the installation.

2. Restore exposed finishes of patched areas and extend finish restoration into adjoining construction in a manner that will eliminate evidence of patching and refinishing.

3. Where removed walls or partitions extends one finished area into another finished area, patch and repair floor and wall surfaces to provide an even surface of uniform color and appearance. Remove existing floor and wall coverings and replace with new materials, if necessary, to achieve uniform color and appearance.

4. Where patching occurs in a smooth painted surface, extend final paint coat over entire unbroken surface that contains the patch.

5. Patch, repair or re-hang existing ceilings as necessary to provide an even-plane surface of uniform appearance.

D. Perform cutting and patching work if listed in Division 011400 "Work Restrictions" to be performed during Government Unoccupied Hours.

3.4 CLEANING

A. Clean areas and spaces where cutting and patching are performed. Completely remove all evidence of the Work.

B. Thoroughly clean piping, conduit, and similar features before applying paint, restored pipe coverings, or other finishing materials.

END OF SECTION 017310