Room addition construction

A room structure for attachment to the exterior wall of a building, comprising:

• an upright frame assembly mounted on a foundation adjacent said wall and including an elongated outer wall frame portion spaced outwardly from said wall, a pair of spaced apart side wall frame portions extending between said wall and said outer wall frame portion at each end thereof, and a roof frame portion extending beteen said wall and said outer wall frame portion at the upper end thereof and between said side wall frame portions at the upper ends thereof,
• means for securing said frame assembly to said building,
• a plurality of structurally independent glazing panel units securely mounted within at least one of said frame portions,
• means for securing adjacent panel units to each other, including an elongated glazing flange mounted on the edges of each panel unit such that said flanges of adjacent units abut one another along their lengths to form an open mastic channel between the abutting flanges for receiving mastic, and a mullion cover lockingly engaging said flanges and covering said mastic channel,
• said mastic channel having a shallow central portion and deeper opposite outer side portions for anchoring said mastic to said flanges, such that said mastic in said mastic channel adheres to said flanges along said outer side portions so as to mechanically lock said flanges together and such that said mastic is stretchable at said central portion of said mastic channel without impairing said adhesion to said flanges.

A glazing flange assembly for securing adjacent glazing panel units to each other, comprising:

• an elongated glazing flange mounted on the edge of each panel unit,
• each of said flanges including an outer side wall, an upper wall extending inwardly from said side wall, a rib extending upwardly from said side wall and a first arm extending upwardly from said upper wall and spaced inwardly from said rib so as to define a first recess therebetween;
• said flanges being mirror images of one another and said outer side walls of said flanges abutting one another such that said ribs, said first arms and said first recesses cooperate to form an open mastic channel for receiving mastic material;
• and
• a mullion cover lockingly spanning and overlapping said first arms of said abutting flanges thereby covering said mastic channel.

A glazing flange assembly for securing adjacent glazing panel units to each other, comprising:

• an elongated glazing flange mounted to the edge of each panel unit,
• each of said flanges including an outer side wall, an upper wall extending inwardly from said side wall, and a first arm extending upwardly from said upper wall and spaced inwardly from said side wall;
• said flanges being mirror images of one another and said outer side walls of said flanges abutting one another so as to form an open mastic channel between said first arms containing mastic material, said mastic channel having opposite side portions adjacent said first arms and a central portion between said side portions;
• a mullion cover lockingly spanning and overlapping said first arms of said abutting flanges thereby covering said mastic channel;
• and
• means for reducing the cross-sectional depth of said central portion of said mastic channel with respect to the depth of said side portions of said mastic channel thereby making the mastic material thinner in the central portion relative to said side portions and allowing said mastic material to stretch in response to movement of said panels without breaking the adhesion between said mastic material and said mastic channel.