Additional anchor methods include perimeter “F” clips and, for curtain wall assemblies spanning multiple floors, steel angles are used to connect vertical mullions at each floor slab. The transition of the AWB to the curtain wall must be completely sealed at the anchors, and accommodate shims, adjustments, and building movement. It is crucial that transition membranes are installed in a manner that does not interfere with or block installed weep holes, preventing proper drainage of the curtain wall.
Installation must work in sequence involving coordination between trades to ensure a continuous, completely sealed AWB is achieved in the building envelope. However, the sequence may vary depending on the type of AWB specified and the fenestration selected. For practical purposes, the interface between the installed curtain wall and the AWB assembly should be completely sealed prior to installing the surrounding cladding. In this manner, all seals and connections within the AWB, transition assembly, and curtain wall can be inspected and tested to address any issues, if necessary.
Key considerations: Storefront systems
Storefront systems are the most economical commercial glazing assembly available due their simplicity. However, they are limited in size, performance, and where they should be used on a building. Today’s storefront systems are typically stick-built and pre-assembled in small sections, making it easier to transport to the job site, and they can be installed in sequence within the building openings. In this process, sealant is applied between the connection in the horizontal and vertical members prior to assembling the frame sections. The critical seal is located on the interior side of the glass pocket behind the glass.
In storefront, the entire elevation is drained at the bottom of the frames with internal drainage occurring in the glass pocket area, whereby water is directed from the horizontal, down the vertical mullions using water deflectors. Sub-sill flashing installed underneath the frame is an integral part of the drainage process. The flashing includes a vertical leg at the interior side and end dams installed on each side forming a panning condition. Bulk water is contained in the sub-sill flashing and drained to the exterior through weep holes.
