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Historic Preservation - Technical Procedures
Resetting A Hinge Mortise
Hspg Prepared For Nps - Sero
Doors And Windows
Resetting A Hinge Mortise
RESETTING A HINGE MORTISE
A. This procedure includes guidance on shimming a hinge
mortise to bring it flush with the surface of the door or
B. If the door has a springy resistance to closure, the
cause may be paint buildup or a poorly executed repair.
If too much material was removed when hinge mortise was
being cut or repaired, the hinge may have worked itself
C. For guidance on resecuring loose hinges that cause the
door to bind, see 08210-01-R.
D. 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 before performing
this procedure and should be followed, when applicable,
along with recommendations from the Regional Historic
Preservation Officer (RHPO).
A. Scrap wood for shims; or prefabricated plastic or metal
B. Utility knife or hack saw to cut shims
A. To discern the door problem, observe the door open and
close a few times. Note the location of any binding or
rubbing. Note also if doors bind inconsistently from top
to bottom or hinge side to latch side.
3.02 ERECTION, INSTALLATION, APPLICATION
A. If problem is paint buildup, strip paint from hinges and
involved surfaces of door and frame.
1. To remove paint from wood, sand the area around
hinges by hand using sanding blocks or sponges;
2. To remove paint from metal hinges, soak hinges in
ammonia to loosen paint; remove paint with metal
scraper and brush; repaint.
B. If problem is more serious, remove door and hinges from
jamb using the procedures below. Free all hinge pins
before removing any of them. Remove from bottom hinge to
top (the top supports most of the weight).
1. Close door and place a wedge under the door to take
weight off hinges.
2. Tap pins gently up and out with hammer and
screwdriver. Apply penetrating oil if pins resist.
3. If a pin still resists, grasp finial of hinge pin
gently and carefully twist with pliers to break the
bond. Try tapping pin out again.
4. If the pin still resists, remove bottom finial and
force pin out from bottom with punch and hammer.
Unscrew hinge from the jamb. Note: A second
person must support door during hinge removal.
C. Cut scrap of thin wood to the exact dimensions of the
mortise so that hinge will be flush with jamb or use
prefabricated plastic or metal shims.
D. Put the shim in place and replace hinges and door.
END OF SECTION