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Historic Preservation - Technical Procedures

Spectitle:
Repairing Existing Leaded Glass

Procedure code:
0882201R

Source:
National Capitol Region Specifications

Division:
Doors And Windows

Section:
Leaded Glass

Last Modified:
02/24/2012

Details:
Repairing Existing Leaded Glass



REPAIRING EXISTING LEADED GLASS


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on repairing leaded
         glass, and includes information on repai= ring lead cames
         and structures, replacing deteriorated lead cames, and
         replacing deteriorated support structure= s.

    B.   This work generally requires a specialist in stain= ed and
         leaded glass repair.

    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 Precaution= s

         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 recomme= ndations for
         their application and use. Include test reports and
         certifications substantiating that produ= cts 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 conditi= on, 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.   Leaded Glass Repair: Prepare sample panel to
              demonstrate quality of materials and workmanship of
              each type of leaded glass indicated to be repaired
              and replaced.

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,<= br>          thickness, texture, pattern and other aesthetic
         characteristics of existing glass.

    B.   Lead Came: Provide new H and U-shape lead came to match
         size, profile and other aesthetic charac= teristics of
         existing lead came.

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

    D.   Braces and Other Accessories: Provide new to match=
         existing.

    E.   Solder: 60% lead and 40% tin composition.

    F.   Cleaner: Manufacturer's standard ammonia-base cleaning
         solution specifically designed for clean= ing of leaded
         glass surfaces.

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

    H.   Clean, soft cloths

2.02 EQUIPMENT

    A.   Stiff bristle brush

    B.   Vacuum


PART 3---EXECUTION

3.01 ERECTION, INSTALLATION, APPLICATION

    A.   Repairing Lead Cames and Structures:

         1.   Soldering Joints: Solder new joints or resolder
              deteriorated or broken joints as follows:

              a.   Clean patina off lead by scraping surface of
                   came with a sharp blade or file to expose
                   shiny lead at least =AC" either side of joint.

              b.   Apply flux to surface of came.

              c.   Apply solder to joint with a soldering iron.

              d.   Darken new solder by treating with tin oxide.

         2.   Replacing Lead Cames: Install new lead cames to
              replace damaged or deteri= orated cames as follows:

              a.   Carefully pry up all edges of came around
                   pieces of glass that are seated in length of
                   came to be replaced. Do not scratch or
                   other= wise damage glass.

              b.   Remove pieces of glass and cut out section of
                   came to be replaced at joints.

              c.   Install new strip of came and solder joints as
                   descr= ibed above.

              d.   Pry up edges of new came and reinstall pieces
                   of glass using a thin layer of putty in
                   chann= els of cames to hold glass tightly in
                   place= .

              e.   Press lead cames down to flat position and
                   repair any broken or damaged solder joints.

              f.   Darken new cames by treating with tin oxide.

         3.   Repairing Support Structures: Replace deteriorated
              support members or supple= ment existing support
              members as required as follows:

              a.   Prior to repair= ing support structures, provide
                   braces and temporary support as required to
                   prote= ct leaded glass work from deflection or
                   other kind of damage.

              b.   Carefully remove deteriorated support members.

              c.   File or scrape old solder deposits from
                   surfa= ces of lead came.

              d.   Repair leaded glass as required to remove
                   bowing or warping.

              e.   Install new support members and solder and
                   fasten to leaded glass.

    B.   Cleaning:

         1.   Clean all leaded glass surface= s.

         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 comple= tely 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 constructi= on
         operation.

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

                         END OF SECTION