Repairing Cracks And Checks In Wood Wall Ornament
- Procedure code:
- Hspg Prepared For Nps - Sero
- Wood and Plastics
- Wood Ornaments
- Last Modified:
REPAIRING CRACKS AND CHECKS IN WOOD WALL ORNAMENT
A. This procedure includes guidance on repairing cracks and
checks in wood either filling, regluing or using a
B. Cracks and checks in interior wood wall ornament are
usually caused by uneven shrinkage, impact damage, or
improperly placed fasteners.
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
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. Interior wood wall ornament may include, but not be
limited to, crown moulding, chair rail, wainscotting,
base, door and window casings and trim, columns and
posts, carved relief pieces, and built-in cabinets and
A. Wood filler: Available from hardware store; Tint to
match existing woodwork.
B. Paint and debris remover (paint or chemical): Available
from hardware store.
C. Wood glue: Available from hardware store.
D. Replacement stock for dutchman: Available from builder's
supply store or lumber yard.
E. Sandpaper: No. 3/0 or No. 5/0 garnet paper.
A. Heat gun or plate
C. Table saw to cut dutchman shims
D. Knife to cut excess shim
A. If a check is a result of dried or shrunken end grain, it
must be filled.
B. Checks on the underside of wood members with no direct water
infiltration generally do NOT need filling.
3.02 ERECTION, INSTALLATION, APPLICATION
A. Filling cracks and checks (for small surface cracks up to
1. Use a proprietary wood filler, or sawdust mixed
with white glue. Work into crack so that no gaps
2. When dry, hand rub filled area with a fine grit
sandpaper to match surface characteristics and
level of surrounding surfaces.
3. Refinish as required to match remaining ornament.
B. Regluing cracks and checks (for larger cracks that
penetrate into the wood ornament):
1. Strip paint and debris from crack area. Before
regluing, make sure joint can be forced back
2. Widen joint slightly to get glue in and work joint
open and closed to spread glue.
3. Clamp joint closed using blocks of wood under
clamps to protect wood. Remove all excess glue
before it dries.
4. Let glue dry for 24 hours before removing clamp.
5. Refinish as necessary to match surrounding
C. Dutchman replacement (for larger cracks that cannot be
filled or glued):
1. Cut long, slender, tapered shims from wood of same
age, species and grain orientation as piece being
2. Pre-fit shim into crack. When shim fits, glue both
shim and crack surface and remove all excess glue.
3. After glue dries, cut shim flush with face of panel
and refinish as necessary to match remaining
END OF SECTION