Patent ID: 7987644

Claim:
A method of constructing a curtainwall for installation on a building located at a construction site where portions of unit frames and cassettes used to form the curtainwall are manufactured at one or more manufacturing facilities, the method comprising: forming the curtainwall at the offsite location apart from the construction site and apart from the manufacturing facilities, the forming comprising: providing a first unit frame at an offsite location, the first unit frame comprising a plurality of mullions connected to one another and padding seals positioned between the connected mullions of the first unit frame, the first unit frame having a first unit frame component configured for connection to one or more adjacent unit frames; providing an in-fill cassette at the offsite location, the in-fill cassette comprising a subframe and an interior portion the subframe defining a perimeter of the cassette and having a surface configured for sealing engagement with the first unit frame substantially continuously along the perimeter and including a primary cassette sealing gasket positioned on the surface substantially continuously along the perimeter for sealing between the in-fill cassette and the first unit frame; and installing the in-fill cassette in the first unit frame at the offsite location with a dry fit process, the installing including positioning the perimeter of the subframe against the unit frame and compressing the primary cassette sealing gasket between the subframe of the cassette and the unit frame and securing the cassette to the unit frame; and transporting the curtainwall unit from the offsite location to the construction site for installation on the building.