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Historic Preservation - Technical Procedures

Spectitle:

Patching Cracks And Holes In Woodwork

Procedure code:

0640016R

Source:

National Captiol Region Specifications

Division:

Wood And Plastics

Section:

Architectural Woodwork

Last Modified:

11/12/2014

Details:

Patching Cracks And Holes In Woodwork



PATCHING CRACKS AND HOLES IN WOODWOR= K


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on patching cracks and
         small holes in woodwork.

    B.   See 01100-07-S for general project guidelines to be
         reviewed along with this procedure.  These guidelines
         cover the following sections:

         1.   Safety Precautions

         2.   Historic Structures Precautions

         3.   Submittals

         4.   Quality Assurance

         5.   Delivery, Storage and Handling

         6.   Project/Site Conditions

         7.   Sequencing and Scheduling

         8.   General Protection (Surface and Surrounding)

         These guidelines should be reviewed prior to performing
         this procedure and should be followed, when applicable,
         along with recommendations from the Regional Historic
         Preservation Officer (RHPO).

1.02 REFERENCES

    A.   AWI  Quality Standard: Comply with applicable
         requirements of the latest edition of "Architectural Woodwork Standards", published by the Architectural Woodwork
         Institute (www.AWInet.org), except as otherwise indicated.

1.03 SYSTEM DESCRIPTION

    A.   Performance Requirements: Submit written program for each
         phase of restoration process including protection of
         surrounding materials on building during operations.
         Describe in detail materials, methods and equipment to be
         used for each phase of restoration work.

1.04 QUALITY ASSURANCE

    A.   Mock-Ups: Prior to start of wood restoration work,
         prepare the following sample panels in building where
         directed by RHPO. Obtain RHPO's acceptance of visual
         qualities before proceeding with the work. Retain
         acceptable panels in undisturbed condition, suitably
         marked, during construction as a standard for judging
         completed work.

         1.   Wood Repair: Prepare sample panels for each type of
              woodwork indicated to be patched, resurfaced,
              modified or replaced. Prepare mock-up panels on
              existing woodwork to demonstrate quality of
              materials and workmanship.

1.05 PROJECT/SITE CONDITIONS

    A.   Existing Conditions:

         1.   Installer shall advise Contractor of temperature
              and humidity requirements for woodwork installation
              areas. Do not install woodwork until required
              temperature and relative humidity have been
              stabilized and will be maintained in installation
              areas.

         2.   Maintain temperature and humidity in installation
              area as required to maintain moisture content of
              installed woodwork within a 1.0 percent tolerance
              of optimum moisture content, from date of
              installation through remainder of construction
              period. The fabricator of woodwork shall determine
              optimum moisture content and required temperature
              and humidity conditions.


         3.   Determine that surfaces to which finishes are to be
              applied are even, smooth, sound, clean, dry and
              free from defects affecting proper application.
              Correct or report defective surfaces to Contracting
              Officer.


PART 2---PRODUCTS

2.01 MATERIALS

    A.   Patching Materials:

         1.   Wood Filler: Standard filler manufactured
              specifically for restorative patching of woodwork.

              a.   Tint filler to match existing woodwork.

         2.   Sandpaper: No. 3/0 or No. 5/0 garnet paper.

    B.   Replacement Wood: Match species, grade, grain pattern,
         and other special characteristics of existing woodwork.


PART 3---EXECUTION

3.01 ERECTION, INSTALLATION, APPLICATION

    A.   Remove all minor surface imperfections such as scratches,
         dents, etc., by rubbing surface with a fine grit
         sandpaper.

    B.   Patch all holes and cracks in woodwork up to 1/4 (one quarter) inch across
         with wood filler tinted to match existing wood.

    C.   Carefully hand rub filled area with a fine grit sandpaper
         to match surface characteristics of adjacent woodwork.

    D.   Touch-up patch during finishing so that color and other
         appearance characteristics of filled area match the
         finish of adjacent woodwork. See 06400-05-R, 06400-06-R,
         and 06400-10-R for guidance on refinishing.

    E.   Patch holes and cracks in woodwork 1/4 (one quarter) inch and greater across
         and woodwork damaged from hardware changes with wood
         plugs or wood patches or as directed by manufacturer.

    F.   Rout out hole or crack woodwork to receive plus or patch
         materials.  Veneer-type patches shall be comparable to the thickness of the surrounding intact veneer 

       and a minimum of 1/28 (one twenty-eighth) inch thick, referring to the thickness of the veneer.

    G.   All repair plugs and patches in wood with a transparent
         finish shall have grain aligned.

3.02 ADJUSTING/CLEANING

    A.   Upon completion of this work, all floors, walls, and
         other adjacent surfaces that are stained, marred, or
         otherwise damaged by work under this section shall be
         cleaned and repaired and all work and the adjacent areas
         shall be left in a clean and perfect condition.

    B.   All completed work shall be adequately protected from
         damage by subsequent building operations and effects of
         weather. Protection shall be by methods recommended by
         the manufacturer of installed materials and as approved
         by the RHPO.

    C.   Repair damaged and defective woodwork wherever possible
         to eliminate defects functionally and visually; where not
         possible to repair properly, replace woodwork. Adjust
         joinery for uniform appearance.

    D.   Clean woodwork:  Dust and damp wipe woodwork with a soft
         cloth dampened in clean water; dry rub with soft cloth to
         maintain the polish, rubbing along the grain of the wood.

    E.   Stain and Spot Removal:

         1.   Stains may be cleaned by prompt damp wiping with
              cloth dampened in clear water or rubbing with cloth
              dampened in solvent. Dry the wood with a soft
              cloth.

         2.   White spots may be removed by rubbing them with a
              small amount of linseed oil.

                         END OF SECTION
 


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