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Historic Preservation - Technical Procedures

Spectitle:
Restoring Wood Window Sash And Frames

Procedure code:
0861006R

Source:
Internet - Castle Hill Window Restoration

Division:
Doors And Windows

Section:
Wood Windows

Last Modified:
02/24/2012

Details:
Restoring Wood Window Sash And Frames



RESTORING WOOD WINDOW SASH AND FRAMES


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on restoring the
         appearance of wood window sash and frames and preserving
         the wood.  This includes removing the existing paint by
         hand, removing deteriorated glazing compound, treating
         weathered wood surfaces with wood preservative, reglazing
         as needed, priming and repainting.

    B.   The choice to fully restore wood windows can be an
         expensive investment, but the choice will likely reduce
         future maintenance costs and extend the life of the
         original windows.

    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 MANUFACTURERS

    A.   Sika Corporation
         201 Polito Ave.
         Lyndhurst, NJ  07071
         201/933-8800

    B.   DAP
         855 N. Third St.
         P.O. Box 277
         Dayton, OH 45401-0277

2.02 MATERIALS

    A.   80  to 120 grit sandpaper

    B.   Rust-inhibiting Alkyd-based Primer

    C.   Penatrol

    D.   Wood Preservative:  A mixed solution consisting of 60%
         boiled linseed oil and 40% mineral spirits.  NOTE: THE
         DRYER THE WOOD, THE GREATER PERCENTAGE OF LINSEED OIL
         SHOULD BE USED.

    E.   Caulking Compound such as "SikaFlex" (Sika Corporation),
         or other durable, flexible caulk that bonds well with the
         combination of latex and alkyd paints.

    F.   Linseed Oil

    G.   Glazing Compound such as "DAP 33" (DAP), or approved
         equal.

    H.   Latex or alkyd paint - compatible with primer

2.03 EQUIPMENT

    A.   Hand-held Orbital Sanders (NO ROTARY OR DISK SANDERS)

         B.   Stiff bristle brushes

         C.   Paint brushes

         D.   Putty knife


PART 3---EXECUTION

3.01 EXAMINATION

    A.   Verification of Conditions: Determine the type of wood
         used and understand its properties.  Pine for instance is
         much softer than oak.  Therefore, special care should be
         taken on the pine elements so as not to damage or obscure
         any detail.

3.03 ERECTION, INSTALLATION, APPLICATION

    A.   Remove paint from sash, frame and sill by hand.

         1.   Carefully sand the surface by hand using 80  to 120
              grit sandpaper. Hand-held orbital sanders may be
              used on large, flat surfaces.  Follow the grain of
              the wood.  NOTE: THIS EQUIPMENT SHOULD BE USED BY
              EXPERIENCED OPERATORS ONLY.  For alternative
              methods in removing paint from wood features, see
              06400-07-R and 06400-09-R.

              CAUTION: PAINT MAY CONTAIN LEAD.  FOLLOW EPA
              REGULATIONS AND SAFETY GUIDELINES INCLUDING THOSE
              REQUIRED FOR THE REMOVAL AND DISPOSAL OF LEAD-BASED
              PAINT.

         2.   Reset all exposed nail heads and treat with rust-
              inhibiting primer.  Penatrol may be added to the
              primer to aid in preventing oxidation of old nail
              heads.

    B.   Remove deteriorated glazing compound and glazing.

    C.   Brush apply wood preservative to all wood surfaces.

    D.   Caulk seam cracks and crevices in the surface with the
         caulking compound.

    E.   Sand smooth transitions between muntin/mullion and
         remaining original glazing.  

    F.   Soak any bear weathered wood with linseed oil.

    D.   Replace glazing and apply the glazing compound smooth and
         evenly to the surface.

    F.   Apply a final coat of paint to match the existing paint.

                         END OF SECTION