Specification:Repair and reattachment of wood shingles

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=GENERAL=

DESCRIPTION
 This specification provides guidance for repair and reattachment of wood shingles. This specification has been developed for use on historic properties (defined as any district, site, building, structure, or object that is listed in or eligible for listing in the National Register of Historic Places) and provides an overview of accepted practices. The Architect will provide site-specific specifications, when appropriate. All work described herein and related work must conform to the Secretary of Interior’s Standards for the Treatment of Historic Properties. The Contractor shall provide all labor, materials, equipment, and operations required to complete the rehabilitation work indicated herein. All work described herein and related work must have the approval of a Cultural Resources Manager, Conservator, Historic Architect, or other professional who meets the standards outlined in the Secretary of the Interior’s Standards – Professional Qualifications Standards pursuant to 36 CFR 61. Such person is referred to in this document as the Architect. 

SECTION INCLUDES
 Repairs to Minor Splits or Holes in Wood Shingles  A minor split may be defined as one measuring less than half the exposure of the shingle.</li> Shingles with splits longer than half the exposure should be replaced.</li> </ol> </li> Removal and Replacement of Individual Wood Shingles</li> </ol>

RELATED SECTIONS
<ol type="A"> Section 06200 – Fasteners for Historic Exterior Wood</li> Section 06300 – Cleaning of Atmospheric Soiling, Biogrowth, and Mold on Historic Wood</li> Section 07631 – Flashing, Gutters and Drains</li> </ol>

SUBMITTALS
The Contractor shall submit to the Architect: <ol type="A"> A detailed schedule of the areas for repair, including and assessment of the problem shingle areas.</li> Product data for all manufactured materials shall include certification of compliance with specified standards and instructions for handling, storage, and installation of the material, and Material Safety Data Sheets for each material. Submit manufacturer’s product literature for wood shingles and for fire retardant wood treatment. Literature for wood shingles shall include certification of compliance with applicable building code standards.</li> Samples: Submit three samples of roof shingles from multiple material bundles. Samples shall be the same size, texture and color as those to be used for the work.</li> </ol>

QUALITY ASSURANCE
<ol type="A"> Work Experience: The Contractor to perform the work in this section shall have demonstrated experience approved by the Architect, ideally a minimum of seven years experience in historic roof replacement/restoration and shall have successfully completed at least three projects of similar scope within the previous five years. He/She shall demonstrate a working knowledge of The Secretary of the Interior’s Standards for the Treatment of Historic Properties with Guidelines for Preserving, Rehabilitating, Restoring & Reconstructing Historic Buildings.</li> Warranty: The Contractor shall provide the roof shingle manufacturer’s warranty for material plus provide an additional five-year warranty against deterioration due to installation issues.</li> </ol>

MOCK-UPS
<ol type="A"> In the presence of the Architect, all personnel to be assigned to the project shall demonstrate their ability to complete the required work in an acceptable manner. The process of determining contractor ability will be left to the discretion of the Architect based on the specific technical needs of the project. The Contractor must demonstrate a comprehensive understanding of the unique skills needed during the replacement of damaged shingles and the installation of new wood shingles, in particular allowing for ventilation under the shingle post installation. </li> </ol>

DELIVERY, STORAGE AND HANDLING
<ol type="A"> Deliver materials to the site in manufacturer’s unopened bundles with the manufacturer’s labels intact and product identification visible.</li> Wood materials delivered to the site shall be stored on pallets or dunnage above grade in such a manner as to allow adequate air circulation. Stored materials shall be protected from the weather using tarpaulins or similar waterproof membrane.</li> The Contractor shall dispose of all packaging, waste materials and construction debris in accordance with local, state and federal environmental regulations. All wood scrap shall be kept separate for recycling. No burning of debris, waste material or trash will be allowed on site.</li> </ol>

PROJECT/SITE CONDITIONS
<ol type="A"> The Contractor is responsible for protecting existing adjacent materials during the execution of the work. Provide all necessary protection and work procedures to avoid damage to existing material assemblies not a part of the work of this Section. At a minimum, the Contractor shall:  <li>Provide sturdy, weather-proof protection at all areas exposed during shingle installation. Do not leave interior spaces exposed to the elements overnight. The Contractor shall maintain adequate supplies of protective materials on site at all times in the event of sudden weather changes.</li> <li>Protect roof framing during shingle installation by limiting imposed loads.</li> </ol> </li> <li>Provide barriers around the work area to protect other trades and the public. At least one entrance must remain accessible during the course of the work.</li> <li>The Contractor shall coordinate roofing work with the work of other trades to minimize delays in the construction process. Coordinate roofing with other work including, but not limited to, exterior finish carpentry, flashing work and masonry restoration.</li> </ol> =PRODUCTS=

REPLACEMENT WOOD SHINGLES
<ol type="A"> <li>Wood shingles shall be of the highest quality possible that provides as close a match as possible to the historic material being replaced. Size, species and other elements particular to the specific shingle being applied with be determined by the project Architect.</li> </ol>

NAILS
<ol type="A"> <li>Nails used in installation will be per the shingle manufacturer’s specifications. </li> </ol>

Other Materials
<ol type="A"> <li>During the installation, the contractor will install an exposed strip of metal (typically galvanized tin or copper,) below the ridge of the structure in order to serve as a deterrent for the growth of biological material. </li> </ol> =EXECUTION=

GENERAL
<ol type="A"> <li>The Contractor shall review the scope of work and the areas to be repaired with the Architect prior to beginning operations. Any conditions that may adversely impact the proper completion of the work shall be brought to the attention of the owner and the Architect.</li> <li>The Contractor shall minimize traffic on sound areas of the roof to prevent further damage and deterioration to the shingles to remain. All personnel working on the roof shall wear soft-soled shoes.</li> <li>When working off ladders or other platforms, avoid point loading on the wood shingle roofing by providing plywood or other rigid materials where necessary under ladders. The Contractor shall replace any additional shingles damaged during the course of the work at no additional charge to the Owner.</li> </ol>

REPAIR OF SPLITS AND HOLES
<ol type="A"> <li>Repair wood shingles that are split by sliding a piece of sheet metal (called a bib) underneath the split and up under the subsequent courses. <ol> <li>Sheet metal bibs shall be cut to allow one inch on either side of the split and of sufficient length to penetrate under the course above.</li> <li>Slide bib into place and fasten with a single nail driven under the course above. Seal the split and the nail hole with sealant.</li> </ol> </li> <li>Repair shingles with holes in a similar fashion by sliding a bib underneath the hole, fastening in place and sealing with sealant.</li> </ol>

REPLACEMENT OF INDIVIDUAL SHINGLES
<ol type="A"> <li>Carefully break damaged shingle apart using a hammer and chisel, making sure not to damage surrounding shingles. Gently remove all pieces of the damaged shingle, sliding them out from underneath the courses above. The course above may be pried upward slightly to ease removal of the damaged pieces. Cut the associated nails with a shingle ripper or hacksaw blade.</li> <li>Select a replacement shingle of such width as to leave 3/16-inch space on each side for expansion.</li> <li>Tap the new shingle into place until it hits the remaining nails. Remove the shingle and cut slots at the nail locations to such depth as to allow the shingle to be placed in alignment with the adjacent shingles.</li> <li>Tap the replacement to within approximately 3/8-inch of its final position. Drive two new nails at a 45 degree angle through the shingle and under the course above. Tap the new shingle into its final position using a hammer and block.</li> </ol>

FINAL REPORT
<ol type="A"> <li>Provide a final report of completed work including all approved submittals and photographs of the repaired areas taken before, during and after the work.</li> </ol>