SYSTEMS Structural glazing curtain wall systems may be found in many cities in Canada and in the United States.
It may be found with two or four sided capless glazing applications.
In Canada only two sided applications are used with the vertical joints of the IGUs being capless but there are a few specially designed four sided examples.
A structural glazing curtain wall system uses the same aluminum mullion components as the stick built curtain wall except that the mullion nose (neck) of the verticals is omitted to create a capless vertical joint system.The vertical joints between the IGUs are sealed on the outside with silicone sealant for a flush exterior appearance.The horizontal mullions are constructed with standard pressure plates and caps.
Tohold the IGU against the aluminum of the vertical mullion,the inner light of the IGU is held apart from the aluminum mullion with a gasket or spacer tape and a structural silicone sealant is applied between the glass and the aluminum.The joint or contact width is about 12.5 mm (or 1/2 inch).The structural silicone sealant forms a strong adhesive bond having a minimum strength of 20 psi.When the shop drawings are submitted to a silicone manufacturer,they will often warranty an application for twenty years if it is determined that all materials are compatible by testing. Silicone sealant is vapour permeable.In high humidity indoor environments,where the structural silicone may be exposed to high humidity during winter,the silicone may require a cap bead of moisture resistant sealant (butyl) to minimize the diffusion of humidity into the structural silicone glazed joint
Such a nice post about glass glazing
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