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A mullion acts as a structural member, in most applications the mullion transfers wind loads and weight of the glazing and upper levels into the structure below. In a curtain wall screen, however, the mullions only support the weight of the transoms, glass and any opening vents. Also in the case of a curtain wall screen the weight of glazing ...
The cross-section of each mullion or tracery bar was important both for the structural integrity of the window and for the visual effect. As can be seen in Viollet-le-Duc 's diagram (right) there was normally a roll-moulding on both the inside and outside of the windows, which made the mullions appear even more slender than they actually were.
Millwork building materials include the ready-made carpentry elements usually installed in any building. Many of the specific features in a space are created using different types of architectural millwork: doors, windows, transoms, sidelights, molding, trim, stair parts, and cabinetry to name just a few.
Muntins can be found in doors, windows, and furniture, typically in Western styles of architecture. Muntins divide a single window sash or casement into a grid system of small panes of glass, called "lights" or "lites". In UK use, a muntin is a vertical member in timber panelling or a door separating two panels.
Glass mullion system or glass fin system is a glazing system in which sheets of tempered glass are suspended from special clamps, stabilized by perpendicular stiffeners of tempered glass, and joined by a structural silicone sealant or by metal patch plates.
Astragal: Semi-circular moulding attached to one of a pair of doors to cover the gap where they meet. Baguette: Thin, half-round moulding, smaller than an astragal, sometimes carved, and enriched with foliages, pearls, ribbands, laurels, etc. When enriched with ornaments, it was also called chapelet. [1]
Bolection around panels on a door. A bolection is a decorative moulding which projects beyond the face of a panel or frame in raised panel walls, doors, and fireplaces.It is commonly used when the meeting surfaces are at different levels, especially to hold floating panels in place while allowing them to expand and contract with changes in temperature and humidity.
Mullion wall of the US Embassy, London (1955–60) A mullion wall is a structural system in which the load of the floor slab is taken by prefabricated panels around the perimeter. Visually, the effect is similar to the stone- mullioned windows of Perpendicular Gothic or Elizabethan architecture .