Historic Preservation - Technical Procedures
Patching Cracks And Holes In Woodwork
National Captiol Region Specifications
Wood And Plastics
Patching Cracks And Holes In Woodwork
PATCHING CRACKS AND HOLES IN WOODWOR= K
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 Precaution= s
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).
A. AWI Quality Standard: Comply with applicable=
requirements of Architectural Woodwork Quality Standards,
Premium Grade, published by the Architec= tural Woodwork
Institute (AWI), 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 acceptan= ce of visual
qualities before proceeding with the work. Retain
acceptable panels in undisturbed conditi= on, suitably
marked, during construction as a standard for judging
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 Contrac= tor 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
2. Maintain temperature and humid= ity in installation
area as required to maint= ain moisture content of
installed woodwork within a 1.0 percent tolerance
of optimum moisture conte= nt, from date of
installation through remainder of construction
period. The fabricator of woodwork shall determine
optimum moisture content and required temperature
and humidity conditions.<= br>
3. Determine that surfaces to which finishes are to be
applied are even, smooth, sound, clean, dry and
free from defects affecti= ng proper application.
Correct or report defecti= ve surfaces to Contracting
A. Patching Materials:
1. Wood Filler: Standard filler manufactured
specifically for restorat= ive 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.
3.01 ERECTION, INSTALLATION, APPLICATION
A. Remove all minor surface imperfections such as scratches,
dents, etc., by rubbing surface with a fine grit
B. Patch all holes and cracks in woodwork up to =AB&q= uot; across
with woof 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 06400-0= 5-R, 06400-06-R,
and 06400-10-R for guidance on refinishi= ng.
E. Patch holes and cracks in woodwork =AB" and greater across
and woodwork damaged from hardware chang= es with wood
plugs or wood patches.
F. Rout out hole or crack woodwork to receive plus or patch
materials. Veneer-type patches shall be a minimum of =AC"
G. All repair plugs and patches in wood with a transp= arent
finish shall have grain aligned.
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
2. White spots may be removed by rubbing them with a
small amount of linseed oil.
END OF SECTION