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Windblown objects, welding sparks or other material that contacts the glass surface during construction may cause irreversible damage. Weathering metals, alkaline materials or abrasive cleaners may cause surface damage. Once the glass is installed, the architect, general contractor or building owner should provide for glass protection and cleaning.
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Viracon recommends a 5-7° lean against two wide, sturdy uprights, which are capable of withstanding crate weight. Refer to Viracon’s Glass Staining Tech Talk for additional information on glass staining and storage. Improper air circulation for spandrel glass may result in glass damage or staining. Also, ensure proper blocking and protection from outside elements. Store glass crates properly to prevent them from tipping. Improper glass storage techniques may result in damage to glass components, glass surfaces, coatings or glass breakage. To see an example of a rolling block, refer to the Glass Association of North America (GANA) glazing manual. Use rolling blocks if the insulating units are rotated or “cartwheeled” on their corners. Do not allow glass edges to contact the frame or any hard surface during installation. For products not identified on the chart, contact Viracon for sightline requirements specific to your project.Ĭare needs to be taken during handling and glazing to ensure that glass damage does not occur. Viracon offers a Deflection and Sightline Reference Guide to assist in identifying the appropriate sightline based on glass size and load. Sightlines are calculated based on ASTM C1249 Standard Guide for Secondary Seal for Sealed Insulating Glass Units for Structural Sealant Glazing Applications.
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The sightline for insulating glass used in a structurally glazed application must be calculated based on the unit size and design loads in order to appropriately support the insulating unit and exterior glass ply. When structurally glazed, the framing system is typically not visible on the exterior facade along the structurally glazed sides. Structural silicone glazing uses silicone sealant on one or more sides of the insulating unit for the structural transfer of loads from the glass to its perimeter support system and retention of the glass in the opening. Insulation should be installed with a 1" space between the glass and insulation. Viracon does not recommend or warrant applications in which insulation is applied directly to the glass. Failure to adhere to the following guideline for spandrel glass will void its warranty. Viracon architectural products carry limited warranties. Viracon’s warranties do not cover incompatibility. It is especially important to refrain from using cement-based grouts as they may be incompatible with laminated glass. When utilizing a laminated glass railing, review GANA’s Glass Informational Bulletin GANA 09-0417, Use of Laminated Glass in Railing Systems. Offset of adjoining members must not exceed 1/32" at the corners.Squareness must be controlled to 1/8" difference in the lengths of the diagonals.Bow must not exceed 1/16" in any four foot length of the framing.Twist of the horizontal sill member between the ends and center of each span, due to the weight of the glass, must be limited to one degree.Deflection of the horizontal sill member due to the weight of the glass should not exceed 1/8" nor should the deflection decrease the head clearance of the panel below by more than 25%.Deflection of the framing members under design loads must not exceed the length of the span divided by 175.The following framing tolerances are required: The framing system must be designed to provide structural support to the glass and essentially allow the glass to float within the frame.