Glass without limitations

Guide Specifications for USA

The specifications below are offered as suggested inclusions in glass and glazing specifications. They are not intended to be complete. A qualified design professional should verify all the information and determine what is suitable for a particular product, use and/or specific application. They must be reviewed and approved by an appropriate party before publishing as a finished specification.





  1. Section Includes: Monolithic heat-strengthened glass.
  2. Related Sections
    1. Drawings, General and Supplementary Conditions of the Contract, Division 1 and the following Specification Sections, apply to this Section.
    2. Section 08400 - Entrances and Storefronts
    3. Section 08500 - Windows
    4. Section 08600 - Skylights
    5. Section 08900 - Glazed Curtain Walls


  1. United States
    1. ASTM C162 - Standard Terminology of Glass and Glass Products.
    2. ASTM C1036 - Standard Specification for Flat Glass.
    3. ASTM C1048 - Standard Specification for Heat-Treated Flat Glass -- Kind HS, Kind FT Coated and Uncoated Glass.
    4. ASTM C1376 - Standard Specification for Pyrolytic and Vacuum Deposition Coatings on Glass.
    5. ASTM E1300 - Standard Practice for Determining the Minimum Thickness and Type of Glass Required to Resist a Specified Load


  1. Heat-Strengthened Glass - Glass that has been heat-treated using the horizontal (roller hearth) method and complies with:
    1. USA - ASTM C1048, Type I, Class 1 (clear), Class 2 (tinted), Quality Q3, Kind HS.
  2. Performance Characteristics
    1. Center-of-Glass - Performance values that take only the center portion of a glass makeup into account and not the framing members. Customarily found in Sweets catalogs and at and used in 08800 architectural specifications.
    2. Glass thermal and optical performance properties shall be based on data and calculations from the current LBNL WINDOW 5.2 (or 4.1 - please specify which version) computer program.
    3. Fenestration Performance - Performance values that take into account the total fenestration (center-of-glass and framing members). Normally identified with building energy codes such as ASHRAE-IESNA 90.1 and the IECC. These values can also be tested and certified by the National Fenestration Rating Council (NFRC).


  1. Design Requirements
    1. Provide glazing systems capable of withstanding normal thermal movements, wind loads and impact loads, without failure, including loss due to defective manufacture, fabrication and installation; deterioration of glazing materials; and other defects in construction.
    2. Provide glass products in the thicknesses and strengths required to meet or exceed the following criteria based on project loads and in-service conditions per ASTM E1300.
      1. Minimum thickness of annealed or heat-treated glass products is selected, so the worst-case probability of failure does not exceed the following:
        1. 8 breaks per 1000 for glass installed vertically or not over 15 degrees from the vertical plane and under wind action.
        2. 1 break per 1000 for glass installed 15 degrees or more from the vertical plane and under action of wind and/or snow.


  1. Submit 12-inch (305mm) square samples of each type of glass indicated (except clear monolithic glass products), and 12-inch (305mm) long samples of each color required (except black) for each type of sealant or gasket exposed to view.
  2. Submit manufacturer's product data sheet and glazing instructions.
  3. Glazing contractor shall obtain compatibility and adhesion test reports from sealant manufacturer, indicating that glazing materials were tested for compatibility and adhesion with glazing sealant, as well as other glazing materials.


  1. Comply with published recommendations of glass product manufacturers and organizations below, except where more stringent requirements are indicated. Refer to these publications for glazing terms not otherwise defined in this section or referenced standards.
    1. GANA Publications
    2. AAMA Publications
  2. Single-source fabrication responsibility: All glass fabricated for each type shall be processed and supplied by a single fabricator.


  1. Comply with manufacturer's instruction for receiving, handling, storing and protecting glass & glazing materials.
  2. Delivery: Deliver materials in manufacturer's original, unopened, undamaged containers with identification labels intact.
  3. Storage and Protection: Store materials protected from exposure to harmful environmental conditions and at temperature and humidity conditions recommended by the manufacturer.
  4. Exercise exceptional care to prevent edge damage to glass, and damage/deterioration to coating on glass.


  1. Environmental Requirements: Installation of glass products at ambient air temperature below 40 degrees F (4.4 degrees C) is prohibited.
  2. Field Measurements: When construction schedule permits, verify field measurements with drawing dimensions prior to fabrication of glass products.


  1. None offered for monolithic heat-strengthened glass.



  1. Manufacturer is used in this section to refer to a firm that produces primary glass or fabricated glass as defined in the referenced standards.
    1. Vitre Mfg
    2. Guardian Industries
    3. Pilkington
    4. PPG Industries


  1. Monolithic Heat-Strengthened Float Glass
    1. Glass Type:
    2. Glass Tint:
    3. Nominal Thickness:
    4. Glass Strength: Heat-Strengthened
    5. Coating Orientation: (N/A, Surface #1 or 2)
    6. Performance Characteristics (Center of Glass)
      1. Visible Transmittance: ____%
      2. Visible Reflectance: ____%
      3. Winter U-factor (U-value): ____
      4. Shading Coefficient (SC): ____
      5. Solar Heat Gain Coefficient (SHGC): ____
    7. US Requirements:
      1. Heat-Strengthened float glass shall comply with ASTM C1048, Type I, Class 1 (clear), Class 2 (tinted), Quality Q3, Kind HS.
    8. Glass heat-treated by horizontal (roller hearth) process with inherent roller wave distortion parallel to the bottom edge of the glass as installed when specified.
  2. Glazing Products
    1. Select appropriate glazing sealants, tapes, gaskets and other glazing materials of proven compatibility with other materials that they contact. These include glass products, insulating glass unit seals and glazing channel substrates under installation and service conditions, as demonstrated by testing and field experience.



  1. Site Verification and Conditions
    1. Verify that site conditions are acceptable for installation of the glass.
    2. Verify openings for glazing are correctly sized and within tolerance.
    3. Verify that the minimum required face and edge clearances are being followed.
    4. Do not proceed with glazing until unsatisfactory conditions have been corrected.


  1. Protection
    1. Handle and store product according to manufacturers' recommendations.
  2. Surface Preparation
    1. Clean and prepare glazing channels and other framing members to receive glass.
    2. Remove coatings and other harmful materials that will prevent glass and glazing installation required to comply with performance criteria specified.


  1. Install products using the recommendations of manufacturers of glass, sealants, gaskets and other glazing materials, except where more stringent requirements are indicated, including those in the "GANA Glazing Manual".
  2. Install glass in prepared glazing channels and other framing members.
  3. Install setting blocks in rabbets as recommended by referenced glazing standards in GANA Glazing Manual and IGMA Glazing Guidelines.
  4. Provide bite on glass, minimum edge and face clearances and glazing material tolerances recommended by GANA Glazing Manual.
  5. Set glass lights in each series with uniform pattern, draw, bow and similar characteristics.
  6. Distribute the weight of the glass along the edge rather than at the corner.
  7. Comply with manufacturer's and referenced industry recommendations on expansion joints and anchors, accommodating thermal movement, glass openings, use of setting blocks, edge, face and bite clearances, use of glass spacers, edge blocks and installation of weep systems.
  8. Protect glass from edge damage during handling and installation.
  9. Prevent glass from contact with contaminating substances that result from construction operations, such as weld spatter, fireproofing or plaster.
  10. Remove and replace glass that is broken, chipped, cracked or damaged in any way.


  1. Clean excess sealant or compound from glass and framing members immediately after application, using solvents or cleaners recommended by manufacturers.
  2. Glass to be cleaned according to:
    1. GANA Glass Informational Bulletin GANA 01-0300 - Proper Procedures for Cleaning Architectural Glass Products.
    2. GANA Glass Information Bulletin GANA TD-02-0402 - Heat-Treated Glass Surfaces Are Different.
  3. Do not use scrapers or other metal tools to clean glass.