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Historic Preservation - Technical Procedures

Spectitle:

Closing Open Joints In Wood Wall Moldings

Procedure code:

0644003R

Source:

Hspg Prepared For Nps - Sero

Division:

Wood And Plastics

Section:

Wood Ornaments

Last Modified:

11/12/2014

Details:

Closing Open Joints In Wood Wall Moldings



CLOSING OPEN JOINTS IN WOOD WALL MOLDINGS


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on closing an open joint
         in wood wall molding by removing and reinstalling or,
         when removal is not possible, by filling the piece.

    B.   An open joint in wood wall ornament is usually the result
         of paint build-up.  To repair an open joint, all excess
         paint must be removed.  This procedure provides guidance
         ONLY for repairing open joints.  See 06400-07-R, 06400-02-S
         and 06400-09-R for information on removal of paint
         from wood.

    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

         3.   Submittals

         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).


PART 2---PRODUCTS

2.01 MATERIALS

    A.   Paint removal chemicals (if needed)

    B.   Wood filler

2.02 EQUIPMENT

    A.   Utility knife or scraper to cut paint film

    B.   2 inch wide blade putty knives

    C.   Hammer

    D.   2 prybars

    E.   Nail puller

    F.   Carpenter's nippers for nail heads

    G.   Heat gun or plate for paint removal (see 06400-09-R for
         special precautions when using heat to remove paint from
         wood).

    H.   Scraper or chisel for cleaning joint

    I.   Saw to undercut miter

    J.   Drill for possible pilot hole


PART 3---EXECUTION

3.01 PREPARATION

    A.   Surface Preparation:  Adjacent surfaces and permanent
         equipment must be masked or covered during repair and
         maintenance. Coverings must be adhered without adhesive
         tape or nails. Impervious sheeting that produces
         condensation shall not be used.

3.02 ERECTION, INSTALLATION, APPLICATION

    NOTE:  The repair of an open joint involves the removal and
    reinstallation of the molding, or the filling of open joints
    with wood filler.  ONLY WHEN A JOINT CANNOT BE CLOSED SHOULD
    IT BE FILLED.

    A.   Removing molding -  Start at an inconspicuous corner. Cut
         paint build-up or wallpaper overlap between trim and
         wall.

         1.   Insert two putty knives into edge of board to
              protect molding and wall.  Carefully hammer the
              bent end of prybar between putty knives.

         2.   Using wall as a fulcrum, work the molding away from
              the wall until a nail is spotted.  Hold space open
              with another prybar or shingle and pry at location
              of nail.  Continue until all nails are exposed and
              trim is loose.  Remove trim by hand.

         3.   If two moldings are attached to each other,
              carefully use two prybars against each other.

         4.   Label all removed pieces so that they can be
              identified and reassembled properly.

    B.   Cleaning molding - Remove all nails by pulling finish
         nails through the back of molding.  Carefully cut the
         heads off larger nails and pull the remainder through the
         back.

         1.   Remove paint from molding at joints with heat or
              chemicals (see 06400-07-R, 06400-02-S and 06400-09-R
              for guidance.  Carefully scrape joint clean with
              chisel or scraper.

         2.   If open joint is a miter, undercut miter at one or
              both pieces.

    C.   Reinstalling molding - Temporarily position piece by
         nailing a finish nail half way in though existing nail
         hole.

         1.   If position is correct, nail in place.  Hammer the
              nail at a different angle through same hole.  Use
              nailset to sink final few blows so as not to damage
              surface of wood.

         2.   A new nail hole may be required if a piece is less
              than 5/8" thick.  To avoid splitting, never nail
              within 2" of board end, blunt the head of the nail
              or snip it off, and/or drill a pilot hole.

    D.   Filling open joint - If joint cannot be restored to its
         original position, remove as much paint as possible
         according to manufacturer's instructions.  Fill gap with
         resilient wood filler and let dry.  Add additional filler
         if shrinkage occurs and sand to achieve a smooth finish.
         Reapply finish.

                         END OF SECTION
 


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