 This historic double-hung window has many layers of paint, some cracked and missing putty, slight separation at the joints, broken sash cords, and one cracked pane. Photo: NPS files. |
Repairs to wooden windows are usually labor intensive and relatively
uncomplicated. On small scale projects this allows the do-it-yourselfer
to save money by repairing all or part of the windows. On larger
projects it presents the opportunity for time and money which
might otherwise be spent on the removal and replacement of existing
windows, to be spent on repairs, subsequently saving all or part
of the material cost of new window units. Regardless of the actual
costs, or who performs the work, the evaluation process described
earlier will provide the knowledge from which to specify an appropriate
work program, establish the work element priorities, and identify
the level of skill needed by the labor force.
 After removing paint from the seam between the interior stop and the jamb, the stop can be pried out and gradually worked loose using a pair of putty knives as shown. Photo: NPS files. |
The routine maintenance required to upgrade a window to "like
new" condition normally includes the following steps: 1)
some degree of interior and exterior paint removal, 2) removal
and repair of sash (including reglazing where necessary), 3) repairs
to the frame, 4) weatherstripping and reinstallation of the sash,
and 5) repainting. These operations are illustrated for a typical
double-hung wooden window, but they may be adapted
to other window types and styles as applicable.
Historic windows have usually acquired many layers of paint over
time. Removal of excess layers or peeling and flaking paint will
facilitate operation of the window and restore the clarity of
the original detailing. Some degree of paint removal is also necessary
as a first step in the proper surface preparation for subsequent
refinishing (if paint color analysis is desired, it should be
conducted prior to the onset of the paint removal). There are
several safe and effective techniques for removing paint from
wood, depending on the amount of paint to be removed.
 Sash can be removed and repaired in a convenient work area. Paint is being removed from this sash with a hot air gun. Photo: NPS files. |
Paint removal should begin on the interior frames, being careful
to remove the paint from the interior stop and the parting bead,
particularly along the seam where these stops meet the jamb. This
can be accomplished by running a utility knife along the length
of the seam, breaking the paint bond. It will then be much easier
to remove the stop, the parting bead and the sash. The interior
stop may be initially loosened from the sash side to avoid visible
scarring of the wood and then gradually pried loose using a pair
of putty knives, working up and down the stop in small increments. With the stop removed, the lower or interior
sash may be withdrawn. The sash cords should be detached from
the sides of the sash and their ends may be pinned with a nail
or tied in a knot to prevent them from falling into the weight
pocket.
"The Repair of Historic Wooden Windows" an Historic Preservation Brief
