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Historic Preservation - Technical Procedures

Spectitle:

Repairing Scratches, Gouges And Dents In Wood Wall Ornament

Procedure code:

0644004R

Source:

Hspg Prepared For Nps - Sero

Division:

Wood And Plastics

Section:

Wood Ornaments

Last Modified:

11/12/2014

Details:

Repairing Scratches, Gouges And Dents In Wood Wall Ornament



REPAIRING SCRATCHES, GOUGES, AND DENTS IN WOOD WALL ORNAMENT


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on repairing scratches,
         gouges and dents in wood by sanding and filling with
         putty as required.

    B.   Scratches, gouges and dents in wood wall ornament are
         usually the result of an abrasive object coming into
         contact with the surface of the wood member in question.
         This type of damage is usually avoidable if care is taken
         around wood surfaces.

    C.   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 DEFINITIONS

    A.   Interior wood wall ornament may include crown moulding,
         picture rail, chair rail, wainscotting, base, and casing.

    B.   For the purpose of this procedure, repair of interior
         wall ornament may also pertain to interior wood wall
         covering and trim; ceiling covering, trim, and ornament;
         door trim; window trim; ornamental columns and posts; and
         built-in cabinets and bookcases.

    C.   Scratches are slight marks produced by rubbing, scraping
         or tearing with something sharp or rough.  Gouges are
         blunt grooves or holes and are generally deeper than
         scratches.  Dents are depressions or hollows made by a
         blow or by pressure.


PART 2---PRODUCTS

2.01 MATERIALS

    A.   Sandpaper

    B.   Wood stain

    C.   Linseed oil putty

    D.   Wood filler (there are four basic types):

         1.   Water-mix Wood Putty:  Easy to tint and fairly
              resilient, but has poor moisture resistance.

         2.   Solvent-based Wood Filler:  Not tintable, but has
              many color choices. A solvent is needed to clean
              any excess or spills. It is difficult to sand, but
              has good adhesion and moisture resistance. It also
              has a problem with shrinkage.

         3.   Acrylic Latex Wood Filler:  Better than water-based
              in adhesion, moisture resistance, and flexibility.
              Apply the filler in layers to avoid shrinkage.

         4.   Two-part Polyester Filler:  Similar to auto body
              filler. It has excellent adherence and moisture
              resistance with minimal shrinkage. It stains
              easily, but is time consuming to prepare.

2.02 EQUIPMENT

    A.   Putty knife to apply filler

    B.   Any mixing tools required for filler.

    C.   Steam iron and moist cloth


PART 3---EXECUTION

3.01 EXAMINATION

    A.   Inspect for paint that is worn, chipped, peeling,
         blistered, or flaking.  If any of these conditions exist
         there may be moisture entering the feature.  Check for
         possible sources of this moisture and correct as
         necessary.

    B.   Inspect for the signs of decay and/or insect infestation
         and make repairs as necessary.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   Carefully hand rub scratches and minor surface
         imperfections with a fine grit sandpaper.  Match patina
         of unscratched wood by selective staining.  Do not remove
         more than 1/16" thickness of the material.  Maintain
         levelness of surface over entire width or length of wood
         piece.

    B.   Small gouges and nail holes can be filled using linseed
         oil putty. Stain the putty to match using the sediment
         from the bottom of the stain can, or use universal tints.

    C.   For large holes, use a sandable filler.  Stain to match
         as above (if needed).

    D.   Lift dents with steam iron and moistened cloth. Moisture
         will raise the grain of the wood surface and it will have
         to be sanded smooth and refinished.

    E.   Touch-up resurfaced area during finishing so that color
         and other appearance characteristics match the finish of
         adjacent woodwork.

                         END OF SECTION
 


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