Historic Preservation - Technical Procedures
- Replacing Deteriorated Woodwork
- Procedure code:
- National Capitol Region Specifications
- Wood And Plastics
- Architectural Woodwork
- Last Modified:
- Replacing Deteriorated Woodwork
- Last Modified:
REPLACING DETERIORATED WOODWORK
A. This procedure includes guidance on wood restoration work
including repairing existing woodwork by removing damaged
or deteriorated material and replacing with new to match
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
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 Standards,
published by the Architectural Woodwork
Institute (www.AWInet.net), 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
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
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
A. New or Replacement Materials:
1. Wood Moisture Content: Provide kiln-dried lumber
with an average moisture content range of 6% to 11%
for interior work. Maintain temperature and
relative humidity during fabrication, storage and
finishing operations so that moisture content
values for woodwork at time of installation do not
exceed the above range.
2. Replacement Wood: Match species, grade, grain
pattern, and other special characteristics of
B. Clean, soft cloths
A. Surface Preparation:
1. Condition woodwork to average prevailing humidity
conditions in installation areas prior to
2. Back prime woodwork on all surfaces which will be
concealed with one coat of wood primer. Schedule
delivery to allow time for application and drying
of Back prime coat before installation of woodwork.
3. Remove miscellaneous hardware, nails, etc., from
all existing woodwork as required to provide a
first class installation of new or replacement
4. Prior to installation of new architectural
woodwork, examine shop fabricated work for
completion, and complete work as required,
including back priming and removal of packing.
3.02 ERECTION, INSTALLATION, APPLICATION
A. Carefully remove at locations indicated any damaged or
deteriorated woodwork. Unless indicated otherwise,
replace the entire length of the existing damaged piece
to the next butt joint.
B. For partial replacement of existing pieces, use a neat,
well-fitted level cut with grain aligned in transparent
C. Install new pieces as described below:
1. Install the work plumb, level, true and straight
with no distortions. Shim as required using
2. Cut to fit unless specified to be shop-fabricated
or shop-cut to exact size. Where woodwork abuts
other finished work, scribe and cut for accurate
fit. Before making cutouts, drill pilot holes at
3. Standing and Running Trim: Install with minimum
number of joints possible, using full-length pieces
(from maximum length of lumber available) to the
greatest extent possible. Stagger joints in
adjacent and related members. Cope at returns,
miter at corners, and comply with Quality Standards
4. Anchor woodwork to anchors or blocking built-in or
directly attached to substrates. Secure to grounds,
stripping and blocking with countersunk, concealed
fasteners and blind nailing as required for a
complete installation. Except where prefinished
matching fasteners heads are required, use fine
finishing nails for exposed nailing, countersunk
and filled flush with woodwork, and matching final
finish where transparent finish is indicated.
D. Finish replacement woodwork to match adjacent woodwork
surfaces. See 06400-05-R and 06400-10-R for guidance.
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