Brickmould: Exterior casing around a fiberglass window through which nails are driven to install the unit. Covers the gap between the frame and masonry opening. In some cases, siding is installed up to the edge of the brickmould.
Bickmould with nailing fin application detail
Trimline brickmould & (optional) snap on cover application detail
K-PAN Brickmould Application Detail
Nailing Fin: An extension of a fiberglass window frame which generally laps over the conventional stud construction and through which nails are driven to secure the frame in place.