Historic Preservation - Technical Procedures
- Repairing Existing Leaded Glass
- Procedure code:
- National Capitol Region Specifications
- Doors And Windows
- Leaded Glass
- Last Modified:
- Repairing Existing Leaded Glass
- Last Modified:
REPAIRING EXISTING LEADED GLASS
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
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).
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
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
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
1.04 DELIVERY, STORAGE AND HANDLING
A. Packing and Shipping: Protect materials during transit,
delivery, storage and handling to prevent damage, soiling
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=
E. Solder: 60% lead and 40% tin composition.
F. Cleaner: Manufacturer's standard ammonia-base cleaning
solution specifically designed for clean= ing of leaded
G. Water for Cleaning: Clean, potable, free of oils, acids,
alkalis, salts and organic matter.
H. Clean, soft cloths
A. Stiff bristle brush
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
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.
1. Clean all leaded glass surface= s.
2. Vacuum or brush loose dirt and dust from surfaces
3. Wash both sides of glass using a clean cloth and
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
A. Protect leaded glass from damage during constructi= on
B. At completion of project, remove any protective coverings
and reclean any soiled surfaces using procedures and
materials described herein.
END OF SECTION