Prime window unit installation system

In combination,

• a wall structure having a window unit opening therein defined by a sill, opposite side walls and a top lintel,
• a new prime window unit including a new head jamb, side jambs, sill and sash,
• an elongated bottom channel,
• a pair of elongated side channels having upper and lower ends, a top channel,
• said channels comprising separate independent members adapted for connection to said new prime window unit,
• fastening means securing said bottom channel and side channels to said new sill and side jambs respectively,
• said top channel being connected to and extended between the upper ends of said side channels,
• each of said channels including an inner wall, and an outer wall, said inner wall extending exteriorly of said new prime window unit thereby to recess said new prime window unit interiorly of said outer wall, and said outer wall extending outwardly from said inner wall,
• each of said channels including means for selectively reducing the outward extent of the outer wall thereof uniformly along the length of said outer wall, whereby the height and width of said new prime window unit assembly conforms to said window unit opening, and
• said new prime window unit assembly being supported as a unit in said window unit opening such that substantially the entire weight of said new prime window unit assembly is borne by the outer walls of said channels.

A method of installing a new prime window unit including a new head jamb, side jambs, sill and sash in an existing window unit opening having an existing window frame installed therein, comprising,

• providing a bottom channel, a top channel and a pair of side channels having upper end portions,
• each of said channels comprising separate independent members adapted for connection to said new prime window unit, and each of said channels having inner and outer walls,
• connecting the bottom channel to said new sill,
• connecting said pair of side channels to respective ones of said new side jambs,
• connecting the top channel to the upper end portions of said side channels so as to extend therebetween,
• selectively reducing the outward extent of at least one of said channels from said new prime window unit uniformly along the length of said channel,
• placing said connected new prime window unit and channels said window opening, and
• supporting the new prime window unit in said opening on the outer walls of said channels.