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Historic Preservation - Technical Procedures

Spectitle:

Rehabilitating Wood Windows

Procedure code:

0861001R

Source:

The Old Custom House/New York, Ny - Gsa/Pbs, 1991

Division:

Doors And Windows

Section:

Wood Windows

Last Modified:

04/11/2014

Details:

Rehabilitating Wood Windows



REHABILITATING WOOD WINDOWS


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance for the rehabilitation
         of wood windows.  Outlined are the steps one might go
         through to complete repairs.  Each step is cross-
         referenced to one or more procedures which covers the
         particular problem.  The cross-referenced procedures
         should be reviewed prior to beginning window repairs and
         should be followed along with recommendations from the
         Regional Historic Preservation Officer (RHPO).

    B.   The steps in the repair of deteriorated sash include but
         are not limited to the following:

         1.   Examination, survey and condition assessment of
              windows.

         2.   Removal of existing sash, trim, etc.

         3.   Repair of deteriorated wood through the use of
              epoxies, dutchmen and/or the replacement with new
              wood to match the existing appearance.

         4.   Painting/refinishing sash and trim.

         5.   Installation of repaired sash.

    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 before performing
         this procedure and should be followed, when applicable,
         along with recommendations from the RHPO.

    D.   For general information on the repair of wood windows see
         08610-01-S, "Preservation Briefs:  9 - The Repair of
         Historic Wooden Windows."

1.02 SUBMITTALS

    A.   Shop drawings for each type of window, including 1/4-inch
         scale wall elevations, typical unit elevations at 3/4-
         inch scale, glazing details, and full-size details of
         typical composite members, include window rehabilitation,
         wood and hardware replacement, reglazing details and
         weatherstripping.

    B.   The RHPO reserves the right to require additional samples
         that show fabrication techniques and construction and
         design of hardware and accessories.

1.03 SEQUENCING AND SCHEDULING

    A.   Rehabilitation of windows shall be completed before doing
         any interior restoration/rehabilitation work to insure
         weather-tight integrity of interior spaces.


PART 2---PRODUCTS

2.01 MATERIALS

    NOTE:  See specific procedures for materials and equipment
    requirements, and their manufacturers and sources.


PART 3---EXECUTION

3.01 EXAMINATION

    A.   Conduct a window-by-window survey to determine existing
         conditions and identify the specific work needs of each
         window.

    B.   For each window type, the survey should include color
         photographs which show design details for comparison to
         new work, and existing conditions.

         1.   Full frame views, both interior and exterior.

         2.   Close-up views of typical details, both interior
              and exterior.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   Carefully remove window stops, sash and trim as required.
         Remove only those features which cannot be repaired on-
         site.  All disassembled parts should be indelibly marked
         or stamped on hidden parts so they can be returned to
         their exact location.

         1.   See 06440-03-R, "Closing Open Joints in Wood Wall
              Ornament"

    B.   Replace rotted window sills as required.  

         1.   See 08610-04-R, "Replacing a Wood Window Sill"

    C.   Repair, replace, or rebuild all rotted or deteriorated
         wood features.  These can include but are not limited to
         stiles, rails, muntins, joints, frame, trim.  New work
         shall match existing profiles or shapes in every respect
         and shall be flush with existing adjacent surfaces.

         1.   See 06300-01-R, "Epoxy Repair for Deterioration and
              Decay in Wooden Members"

         2.   See 08611-01-R, "Sealing Leaky Wood Double-Hung
              Windows"

         3.   See 06440-01-R, "Repairing Cracks and Checks in
              Wood Wall Ornament

         4.   See 06440-03-R, "Closing Open Joints in Wood Wall
              Ornament"

         5.   See 06440-04-R, "Repairing Scratches, Gouges and
              Dents in Wood Wall Ornament"

         7.   See 09560-03-R, "Dutchman Repair of Wood Floor
              Boards"

    D.   Remove paint from both interior (where applicable) and
         exterior surfaces.

         1.   See 06400-07-R, "Chemically Removing Paint From
              Wood Features"

         2.   See 06400-02-S, "Supplemental Guidelines for
              Removing Paint from Interior and Exterior Wood
              Surfaces"

         3.   See 06400-09-R, "Removing Paint From Wood Features
              Using Thermal Methods"

    E.   Remove all deteriorated glazing putty and broken glass.
         Replace glass and reglaze with a flexible elastomeric
         glazing compound.  Clean the existing historic glass.
         See 08800-01-R, "Replacing Broken Glass in Wood and Metal
         Windows"

    F.   Reinstall windows.  Inspect pull chains and weights at
         all double hung windows and adjust, clean or replace as
         required to ensure proper operation.  Lubricate all
         working parts to assure smooth operation.

         1.   See 08760-01-R, "Repairing Double-Hung Window Sash
              Weights and Cords/Chains"

         2.   See 08712-01-R, "Resetting a Hinge Mortise"

    G.   Provide weatherstripping as required.

         1.   See 08500-01-R, "Installing Weatherstripping on
              Metal Double-Hung Windows"

    H.   Refinish both interior and exterior sides of sash, frame
         and trim with appropriate paint, stain or natural finish
         as specified.

         1.   See 06300-01-S, "Primers and Paints for Wood"

         2.   See 06300-02-R, "Surface Preparation for Painting
              Wood"

         3.   See 06400-10-R, "Refinishing Interior Wood"

         4.   See 06310-01-S, "Preparing a Non-toxic Water-
              repellent Preservative"

         5.   See 06310-01-P, "Applying a Water-repellent
              Preservative to Wood"

         6.   See 09900-07-S, "General Guidelines for Painting
              Exterior and Interior Surfaces"

         7.   See 06300-03-R, "Applying a Semi-Transparent or
              Opaque Stain to Wood"

    I.   Hardware:

         1.   All window hardware shall be removed, marked for
              proper room number and location, boxed or packaged,
              and collected in a central location for the
              Contractor who shall polish all the hardware before
              reinstallation.

         2.   All hardware to be removed before paint stripping,
              cleaned to bare metal and repaired to its original
              condition.

         3.   Where hardware is missing or damaged, provide new
              hardware of same design and material as original
              hardware.

3.03 PROTECTION

    A.   Begin and maintain protection and other precautions
         required through the remainder of construction period to
         ensure that newly rehabilitated window units will not be
         damaged throughout the remainder of any restoration or
         rehabilitation work.

                             END OF SECTION
 


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