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An arrangement of three or more individual window units, attached in such a way as to project from the building at various angles. In a three unit bay, the center section is normally fixed with the end panels operable as single hung or casements.


A compressible material placed in a joint before applying a sealant, to limit the depth of the sealant configuration. The material may also act as a bond breaker.


The same as bedding or bed glazing. The small bead of glazing material between the glass and the sash and on the opposite side of the glass from the face glazing. Also, the act of applying the back putty before placing the glass into position.


To shim, level and plumb windows in required position.


A synthetic rubber prepared by co-polymerization of isobutylene with a small amount of isoprene (both ingredients are gaseous hydrocarbons). It can be used as a sealant and architectural glazing tape.


Application of compound or sealant to the flat surface of a member before placing it into position.


British Thermal Unit. The energy used for heating and cooling is measured by the number of BTU’s needed to keep a building at a comfortable temperature. Scientifically, it is the amount of heat energy necessary to raise the temperature of one pound of water one degree Fahrenheit.


A bow window can be arranged with three or more equal width units. They can be fixed or operable or mixed in any combination. They are usually mulled together with a small angle such as 13 degrees.


A release type of material (such as polyethylene film sheet with adhesive on one side) used to prevent adhesion of the sealant to the back-up material or back of the joint. Used in expansion joints or splice joints.


A piece of neoprene, silicone, or other suitable material used to position the glass in the frame. (See spacer.)