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Historic Preservation - Technical Procedures

Spectitle:

Removing And Replacing Structural Glass Wall Panels

Procedure code:

0954001R

Source:

Hsr - Interior Building, Wash, Dc - Grier, Brown, Renfrow

Division:

Finishes

Section:

Special Wall Surfaces

Last Modified:

02/24/2012

Details:

Removing And Replacing Structural Glass Wall Panels



REMOVING AND REPLACING STRUCTURAL GLASS WALL PANELS


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on removing damaged
         structural glass panels and replacing with salvaged or
         new panels.

    B.   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.   Miracle Adhesive Corporation
         Bellmore, New York

    B.   United States Gypsum Association
         810 First Street NE, #510
         Washington, DC  20002
         202/289-5440, FAX 202/289-3707

2.02 MATERIALS

    NOTE:  Chemical products are sometimes sold under a common
    name.  This usually means that the substance is not as pure as
    the same chemical sold under its chemical name.  The grade of
    purity of common name substances, however, is usually adequate
    for stain removal work, and these products should be purchased
    when available, as they tend to be less expensive.  Common
    names are indicated below by an asterisk (*).

    A.   Structural glass to match existing

    B.   Solvent for Removing Adhesive:

         1.   Methyl Ethyl Ketone:

              a.   Other chemical or common names include 2-butanone; MEK*.

              b.   Potential Hazards:  TOXIC AND FLAMMABLE.

              c.   Available from chemical supply house, hardware
                   store or paint store.

         -OR-

         2.   Methyl Isobutyl Ketone:

              a.   Other chemical or common names include
                   Asymmetric ethyl methyl acetone; 3-methyl-2-
                   pentanone; Secondary butylmethyl ketone;
                   MIBK*.

              b.   Potential Hazards:  TOXIC AND FLAMMABLE.

              c.   Available from chemical supply house, hardware
                   store or paint store.

         -OR-

         3.   Acetone (C3H6O):

              a.   A volatile fragrant flammable liquid ketone
                   used chiefly as a solvent and in organic
                   synthesis and found abnormally in urine.

              b.   Other chemical or common names include
                   Dimethyl ketone; Propanone

              c.   Potential Hazards:  VOLATILE AND FLAMMABLE
                   SOLVENT

              d.   Available from chemical supply house or
                   hardware store.

    C.   Stainless steel wire - 1 gauge

    D.   Petroleum-based adhesive such as "Type M Black Magic"
         (Miracle Adhesive Corporation), or approved equal.

    E.   Water-based glass cleaner such as "Glass Plus" (Texize
         Chemicals Company - available at grocery store), or
         approved equal.

    F.   Grout to match existing such as moulding plaster (United
         States Gypsum Company), or approved equal.

    G.   Clean, potable water

2.03 EQUIPMENT

    A.   Mudpan for mixing grout

    B.   Squeeze bottle for applying solvent

    C.   Metal scraper

    D.   Stiff bristle brush (non-metallic)

    E.   Clean, dry cloths

    F.   Hard, rubber trowel


PART 3---EXECUTION

3.01 ERECTION, INSTALLATION, APPLICATION

    A.   Remove damaged or broken structural glass panels.

         1.   Rake and remove grout from joint surrounding piece
              to be removed.

         2.   Using a squeeze bottle, apply solvent to back of
              panels to be salvaged and allow mastic to soften.

         3.   Cut the softened mastic with the stainless steel
              wire and remove the panel from the wall.

         4.   Use solvent and metal scraper to remove remaining
              mastic from the back of structural glass panel.

    B.   Install New or Salvaged Structural Glass Panels:

         1.   Using a stiff bristle brush, remove dirt and debris
              from the surface.  Using a metal scraper, remove
              any remaining adhesive.

         2.   Apply adhesive to back of panel and install to
              match coursing lines and grout joint widths.

         3.   Support glass for at least 24 hours until the
              adhesive has cured.

    C.   Remove mastic from adjacent surfaces using a clean cloth
         and a solvent.

    D.   Mix enough grout for 1 hour supply at a time.  Add enough
         water to form a workable consistency.

    E.   Trowel grout flush into joints.  Take care not to scratch
         the structural glass surface.

    F.   Allow the grout to cure for 72 hours, keeping them damp
         during that period.

    G.   Gently rinse the surface with water and a stiff bristle
         brush.

    H.   Clean the surface with glass cleaner and a soft, clean
         cloth.

                         END OF SECTION