The traditional curtain wall is a frame of aluminum with mullions and transoms quite similar to large framed glazing except that the walls form an independent envelope around the main structure and are generally not resting on the concrete structure but only connected to it.
Curtain Wall Glazing
Structural glazing is a system of bonding glass to an aluminium window frame utilizing a high-strength, high-performance silicone sealant. It uses the adhesive qualities of silicone sealants to retain the glass in the frame by adhesion without the necessity of any mechanical retention such as beads, clips or bolt fixings.Structural glazing with sealants allows perfectly uniform large glazed surfaces, not interrupted by traditional frames or any other supporting or fitting system projecting out of the frame.
Unitized curtain systems units are created and glazed within a factory and then sent to the construction site. Factory assemble reduces reliance of field labour increases quality and speed.This system is well suited for cases where there is requirement of large volume of prefabricated unitized panels. Unitized curtain walls are considered by most design and engineering professionals to be the most technical facade solution for repetitive high-exposure building of scale.
Fully Unitized systems
Semi Unitized curtain walls are more economical and viable on smaller projects and larger ones that require many wall conditions. 50% works are done at the factory level. In semi unitized curtain wall system, the main structure is installed first in the field and is supported by other wide range of materials for the opaque area including glass, metal and composites.