openings not indicated or specified otherwise. Use double-strength sheet
glass or 3 mm 1/8 inch float glass for openings up to and including 1.39
square meters 15 square feet, 4.5 mm 3/16 inch for glazing openings over
1.39 square meters 15 square feet but not over 2.79 square meters 30 square
feet, and 6 mm 1/4 inch for glazing openings over 2.79 square meters 30
square feet but not over 4.18 square meters 45 square feet.
2.1.2
Annealed Glass
**************************************************************************
NOTE: Annealed glass is used for general glazing
where clear or tinted glass is required. Glass
thickness shall be shown on drawings. Under some
heavy thermal conditions, tinted glass may require
heat strengthening for thermal endurance.
**************************************************************************
Annealed glass shall be Type I transparent flat type, Class 1 - [clear]
[tinted], Quality q3 - glazing select, [_____] percent light transmittance,
[_____] percent shading coefficient, conforming to ASTM C 1036. Color
shall be [[gray] [bronze] [_____]].
2.1.3
Heat-Absorbing Glass
**************************************************************************
NOTE:
For Use On Army Projects Only:
Heat-absorbing and light-absorbing glass may be used
in accordance with TI 800-01, DESIGN CRITERIA.
Tinted (light-reducing) glass may be used where
glare is a problem and a reduction of visible light
transmission is desired. Visible light
transmittance will vary from 15 to 85 percent,
depending on color density and thickness. Color
density is a function of thickness and increases as
the thickness increases; visible light transmittance
will decrease as thickness increases. ASTM C 1036
separates Heat-Absorbing and Tinted (light-reducing)
glasses into categories, Higher light transmittance,
and Lower light transmittance, which is based on the
maximum solar energy transmittance by glass
thickness.
Refer to ASTM C 1036 for evaluation quality
requirements and glass manufacturer's data for color
selection, light transmittance and shading
coefficient. When specifying performance and color,
the available ranges of performance and colors
should be specified for glazing units to allow
several manufacturers to bid. When matching
existing glass, provide existing manufacturer's
name, color and acceptable range for shading factor,
light transmittance, indoor and outdoor reflectance.
Heat-absorbing and light-reducing glass is affected
by thermal stresses which can result in breakage.
Care should be taken to make sure that the glass
units will not be thermally overburdened. Glass
that will be thermally overburdened should be
Heat-Strengthened or, if safety glazing is required,
SECTION 08800
Page 13
Previous Page
