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Historic Preservation - Technical Procedures

Spectitle:
Replacing Broken, Missing Or Non-Original Glass With New Leaded Glass Panels

Procedure code:
0882202R

Source:
National Capitol Region Specifications

Division:
Doors And Windows

Section:
Leaded Glass

Last Modified:
02/24/2012

Details:
Replacing Broken, Missing Or Non-Original Glass With New Leaded Glass Panels



REPLACING BROKEN, MISSING OR NON-ORIGINAL GLASS WITH NEW LEADED
GLASS PANELS


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on replacing broken or
         missing glass with new leaded glass to match existing.

    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).  

1.02 SUBMITTALS

    A.   Product Data: Submit manufacturer's technical data for
         each product indicated including recommendations for
         their application and use. Include test reports and
         certifications substantiating that products comply with
         requirements.

    B.   Restoration Program: Submit written program for each
         phase of restoration process including protection of
         surrounding materials on building and site during
         operations. Describe in detail materials, methods and
         equipment to be used for each phase of restoration work.

    C.   Samples: Submit for verification purposes, prior to mock-
         up erection, samples of the following:

         1.   Each type of replacement glass.

         2.   Each type of lead came.

1.03 QUALITY ASSURANCE

    A.   Field Samples: Prior to start of leaded glass restoration
         work, prepare the following sample panels in building
         where directed by RHPO. Obtain RHPO's acceptance of
         visual qualities before proceeding with the work. Retain
         acceptable panels in undisturbed condition, suitably
         marked, during construction as a standard for judging
         completed work.

         1.   Cleaning: Demonstrate materials and methods to be
              used for cleaning on sample panel of approximately
              9 sq. Ft. in area.

         2.   New Leaded Glass Panels: Prepare sample panel to
              demonstrate quality of materials and workmanship
              for each type of new leaded glass panel work.

1.04 DELIVERY, STORAGE AND HANDLING

    A.   Packing and Shipping: Protect materials during transit,
         delivery, storage and handling to prevent damage, soiling
         and deterioration.


PART 2---PRODUCTS

2.01 MATERIALS

    A.   Glass: Provide new glass to match opacity, color,
         thickness, texture, pattern and other aesthetic
         characteristics of existing glass.

    B.   Putty: Standard putty manufactured specifically for
         leaded glass work.

    C.   Braces and Other Accessories: Provide new to match
         existing.

    D.   Cleaner: Manufacturer's standard ammonia-base cleaning
         solution specifically designed for cleaning of leaded
         glass surfaces.

    E.   Water for Cleaning: Clean, potable, free of oils, acids,
         alkalis, salts and organic matter.

    F.   Clean, soft cloths

2.02 EQUIPMENT

    A.   Stiff bristle brush

    B.   Vacuum


PART 3---EXECUTION

3.01 ERECTION, INSTALLATION, APPLICATION

    A.   Replacing Broken, Missing or Non-Original Glass:

         1.   Prior to replacing broken or missing glass, provide
              braces and temporary support as required to protect
              leaded glass work from deflection or other kind of
              damage.

         2.   Pry up edges of lead came around location of new
              piece of glass.

         3.   Remove any fragments of broken glass or any other
              material in channel of lead came that would affect
              installation of new piece.

         4.   Cut new piece of replacement glass and install in
              location using putty in channels to hold new glass
              tightly in place.

         5.   Press lead cames down to flat position and repair
              any broken or damaged solder joints.  See 08822-01-
              R for guidance.

    B.   Cleaning:

         1.   Clean all leaded glass surfaces.

         2.   Vacuum or brush loose dirt and dust from surfaces
              of glass.

         3.   Wash both sides of glass using a clean cloth and
              cleaner.

         4.   Rinse both surfaces thoroughly using a clean cloth
              and clean water to completely remove dirt and
              cleaner residue. Change rinse water frequently.

         5.   Repeat process as required to produce effect
              established by mock-up.

         6.   Wipe the surface with a dry clean cloth to prevent
              streaking.

3.02 ADJUSTING/CLEANING

    A.   Protect leaded glass from damage during construction
         operation.

    B.   At completion of project, remove any protective coverings
         and reclean any soiled surfaces using procedures and
         materials described herein.

                         END OF SECTION