U.S. General Services Administration
Technical Procedures Disclaimer
Prior to inclusion in GSA’s library of procedures, documents are reviewed by one or more qualified preservation specialists for general consistency with the Secretary of Interior Standards for rehabilitating historic buildings as understood at the time the procedure is added to the library. All specifications require project-specific editing and professional judgement regarding the applicability of a procedure to a particular building, project or location. References to products and suppliers are to serve as a general guideline and do not constitute a federal endorsement or determination that a product or method is the best or most current alternative, remains available, or is compliant with current environmental regulations and safety standards. The library of procedures is intended to serve as a resource, not a substitute, for specification development by a qualified preservation professional.
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We’ve reviewed these procedures for general consistency with federal standards for rehabilitating historic buildings and provide them only as a reference. Specifications should only be applied under the guidance of a qualified preservation professional who can assess the applicability of a procedure to a particular building, project or location. References to products and suppliers serve as general guidelines and do not constitute a federal endorsement nor a determination that a product or method is the best alternative or compliant with current environmental regulations and safety standards.
REPAIRING HOLES AND LARGE CRACKS IN PIGMENTED STRUCTURAL GLASS
PANELS
PART 1–GENERAL
1.01 SUMMARY
A. This procedure includes guidance on patching holes in
pigmented structural glass partitions using a polyester
resin.
B. See also 08810-01-R, 08810-01-S and 08810-02-R for
additional guidance on the preservation of pigmented
structural glass panels.
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 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/SUPPLIERS: Do internet search for suppliers of the products.
2.02 MATERIALS
A. Patching Material: Polyester resin adhesive which can be
tinted to match the surrounding glass, such as “Akemi
Transparent Knife Grade” (Akemi Plastics, Inc.), or
approved equal.
B. Pigment: Coloring agent compatible with adhesive and
patching material and recommended by adhesive
manufacturer, such as “Akemi Coloring Paste Iron Oxide”
(Akemi Plastics, Inc.), or approved equal.
C. Polish: Fluid for polishing patching areas recommended by
adhesive manufacturer, such as “Akemi Polishing Fluid”
(Akemi Plastics, Inc.), or approved equal.
PART 3–EXECUTION
3.01 ERECTION, INSTALLATION, APPLICATION
A. Fill all holes and cracks larger than 1/8” with polyester
resin adhesive.
B. Match the dry color of the filler to the color of the
immediate surrounding clean material, using the
manufacturer’s recommended materials.
C. Smooth the surface of the patch level with the
surrounding material. Do not allow filler to extend over
the surface of the surrounding material. Remove all
excess immediately.
D. Polish: After all repair, replacement, and cleaning,
polish with 400 grit wet or dry sandpaper and buff with
polish, following manufacturer’s instructions.