15-10 GLSS
Glass is the most common material to be glazed into the frames for windows, curtain walls, storefronts, and doors. The most commonly used types are plate glass, cleat window glass, wire glass, and pattered glass. Clear window glass is available in thicknesses of 0.085to 2.30 inches; the maximum size varies with the thickness and type. Generally available as single and double strength, heavy sheet and picture glass with various qualities are available in each classification. Clear window glass has a characteristic surface wave that is more apparent in the larger sizes.
Plate glass is available in thicknesses of 3/16 to 1 1/4 inches and as polished plate glass, heavy-duty polished plate glass, rough, or polished plate glass. The more common types are regular, grey, bronze, heat absorbing, and tempered.
Wire glass is available with patterned and polished finishes, and with various designs of the wire itself. The most common thickness is 1/4 inch and it is also available in colors. This type of glass is sued when fire- retardant and safety characteristics (breakage) may be required.
Patterned glass, used primarily for decoration, is available primarily in 7/32—and 1/8—inch thicknesses. Pattern glass provides a degree of privacy, yet allows diffused light into the space.
Other types of glass available include a structural-strength glass shaped like a channel, and tempered, sound-control, laminated, insulating, heat-and glare-reducing, colored, and bullet-resisting glass.
The frame may he single glazed (one sheer of glass) or double glazed (two sheets of glass) which provides increased sound and heat insulation. If the specifications call for double glazed, then twice as many square feet of glass will be required.
Glass is estimated by the square foot with sizes taken from the working drawings.
Because different frames may require various types of glass throughout the project, special care must be taken to keep each type separate. Also to be carefully checked is which frames need glazing, since many windows and doors come with the glazing work already completed. The types of setting blocks and glazing compound require should be noted as well.
REVIEW QUESTIONS
1、Determine the window and/or curtain wall and door materials required for the building in Appendix C. Use workup sheets and sketches.
2、What accessories should be checked for when taking off windows and curtain wall?
3、Define glazing. Why must the estimator determine who will perform the required glazing?
4、What information is required to price a door?
5、Describe the advantages in prefitting and prefinishing doors.
6、Determine the door and hardware requirements for the building in Appendix c. USE workup sheets.
7、Why should the type finish required on the door and door frames be noted on the workup sheet?
8、Describe briefly the ways hardware may be handled on a project.
9、What precautions must an estimator make when using an allowance, from the specifications, in the estimate?
10、What is the unit of measure for glass and why should the various types and sizes required be listed separately?
11、Determine the window and door materials required for the residence in Appendix B.
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