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Historic Preservation - Technical Procedures

Spectitle:

Installing Weatherstripping On Metal Double-Hung Windows

Procedure code:

0850001R

Source:

Hspg Prepared For Nps - Sero

Division:

Doors And Windows

Section:

Metal Windows

Last Modified:

02/24/2012

Details:

Installing Weatherstripping On Metal Double-Hung Windows



INSTALLING WEATHERSTRIPPING ON METAL DOUBLE-HUNG WINDOWS


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on installing various
         types of weatherstripping on metal double-hung windows.

    B.   It is best to use the thinnest material available to fill
         the space where air is entering.  Weatherstripping that
         is too thick can spring hinges and can create additional
         gaps.

    C.   To help seal a structure against the elements,
         weatherstripping can be applied to window and door
         openings. The type and manner of weatherstripping
         installation is very important when applied to historic
         structures. The Regional Historical Preservation Officer
         (RHPO) should be consulted before weatherstripping type
         is chosen or applied.

    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

         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.   Accurate Metal Weatherstripping
         725 South Fulton Ave.
         Mount Vernon, NY 10550
         914/668-6042

    B.   Pemko Company
         Box 3780
         Ventura, CA 93006
         805/642-2600

2.02 MATERIALS

    A.   Metal Integral Weatherstripping (Accurate Metal
         Weatherstripping, Pemko Company), or approved equal.

         1.   Most effective and durable type of weatherstripping

         2.   Most difficult to install, requiring some degree of
              carpentry skill to accomplish.

         -OR-

         Spring Metal Weatherstripping (Accurate Metal
         Weatherstripping, Pemko Company), or approved equal.

         1.   Available in bronze, brass or stainless steel.
              Also available in spring plastic.

         2.   Designed with an integral friction-fit mounting
              clip.

         3.   Attached by nails to the side channels of the
              window frame.

         4.   No applied glue necessary.

         5.   Tight closure insured by thin metal.

         6.   Window must be painted first to prevent galvanic
              corrosion.

         7.   Usually applied around entire perimeter of window;
              On casements, all but hinge side.

         -OR-

         Adhesive-Backed Plastic Spring or Plastic `V' stock or
         Vinyl Strips is a plastic version of spring metal
         weatherstripping. It is attached by adhesive. Channels
         must be thoroughly cleaned before installation because
         the adhesive will not stick to dirty surfaces.  The
         plastic does not last as long as metal.

         1.   Applied after painting.

         2.   in "V" configuration.

         3.   Usually glued to frame; Some have adhesive backing.

         4.   Increased thickness due to adhesive; therefore, not
              always appropriate.

         -OR-

         Compressible Foam Tape:

         NOTE:  ADHESIVE-BACKED FOAM STRIP SHOULD NOT BE USED AT
         ALL.

         1.   Best for large windows where there is a slight
              bending or distortion of the sash.

         2.   Adhesive or plain (to be applied with glue) back.

         3.   Useful for gaps up to 1/4" wide.

         4.   More frequent replacement required than for spring
              metal or vinyl strips.

         -OR-

         Caulking or Sealant Bead and Polyethylene Bond-breaker
         Tape.

         -OR-

         Tubular Gasket Weatherstripping:

         NOTE:  TUBULAR GASKET WEATHERSTRIPPING IS AN EFFECTIVE
         OPTION; BUT, IT IS UNSIGHTLY.  THIS TYPE OF
         WEATHERSTRIPPING SHOULD NOT BE USED.

2.03 EQUIPMENT

    A.   Carpenter's tools needed to remove sash

    B.   Tin snips or radial arm saw

    C.   Table saw or router

    D.   Putty knife


PART 3---EXECUTION

3.01 PREPARATION

    A.   Surface Preparation:  

         1.   Using a heat gun and thin putty knife, break
              existing paint film and remove sashes, see 08610-
              03-R "Unsticking a Wood Window Sash" for guidance.
             
         2.   Strip paint from sash jambs, sill and parting bead.
             
         3.   Caulk and fill cracks that could trap moisture.

         4.   Replace sash cord if needed, see 08760-01-R
              "Replacing a Sash Cord or Chain" for guidance.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   For Metal Integral Weatherstripping:  (follow
         manufacturer's instructions)

         1.   Measure and cut metal for top and upper sides of
              sash. The metal can be cut with tin snips or a
              radial arm saw with metal cutting blade. Miter
              corners.

         2.   With a table saw or router, cut slots in sashes to
              accept weatherstripping.

         3.   Fit metal into upper jambs and head of window frame
              leaving space at sash pulley location and reinstall
              upper sash.

         4.   Install weatherstripping to the lower window frame,
              installing it at the jambs before the sill. Slip
              lower sash into position from above.

         5.   Check for binding in both sashes; reinstall stops.

    B.   For Spring Metal Weatherstripping:  (follow
         manufacturer's instructions)

         1.   Nail strips to sash channels being careful not to
              cover pulleys in upper channel.

         2.   Nail full width strip to underside of bottom sash.

         3.   Slightly nail strip to inside edge of upper sash.

    C.   For Caulking or Sealant Bead and Polyethylene Bond-
         breaker Tape:  (follow manufacturer's instructions)

         NOTE:  THIS PROCEDURE IS EFFECTIVE FOR ALL TYPE OF METAL
         WINDOWS WITH VARYING DEGREES OF AIR INFILTRATION.

         1.   Clean window frame thoroughly using a solvent.

         2.   Allow to dry and prime.

         3.   Apply a bead of silicone caulk.

         4.   Apply bond breaker tape to operable sash covering
              metal section where contact will occur.

         5.   Close window and allow sealant to set (2-7 days
              depending on the temperature and humidity).

         6.   Open window and remove bond breaker tape; The bead
              should have taken the shape of the gap.

    -OR-

    If the window is never opened, it may be sealed shut with
    acrylic latex caulk.  If the window is seldom opened, a roll-
    type temporary caulk may be used.

                             END OF SECTION