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Historic Structural Glass

Early Manufacture & Use

Historic Installation

Exterior Installation

Interior Installation

Reasons for Damage

Maintenance & Repair

Repair of Cement Joints

Reinstall Glass Panels

Removal of Glass

Replacement of Glass


 The next step in the installation procedure was to push the glass panel onto the masonry substrate. Every horizontal seam and abutment was separated by a 1/16 inch thick adhesive cork tape recessed from the front surface by 1/8 inch. Vertical edges were kept apart at a uniform 1/32 inch. In either case, the joint opening was then buttered with a joint cement which was colored to match the surrounding glass.

 Proper detailing at the edges of the veneer could prolong the life of the pigmented structural glass. For example, to prevent possible chipping and cracking of the glass where it met the sidewalk, a cushion of neoprene or leather was provided and the exposed surface then caulked. The side edges of the glass were detiled in a variety of methods or the glass simply terminated at the desired location with the ends ground smooth. In either case, the edge was secured to the substrate with a mastic and the joints or void filled with joint cement or caulking compound. Where the edge of the glass abutted another material, such as the brickwork of a neighboring storefront, the glass was held back 1/8 inch to 1/4 inch from the adjacent material. The gap was usually filled with pliable calk to permit expansion and to prevent moisture migration.



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