TOLERANCES
In
adjacent masonry units
1/8
inch
In
10 feet
1/4
inch
In
20 feet
3/8
inch
In
40 feet or more
1/2
inch
Variations from the plumb for external corners,
expansion joints, and other conspicuous lines
_______________________________________________________________
In 20 feet
1/4 inch
In 40 feet or more
1/2 inch
Variations from the level for exposed lintels,
sills, parapets, horizontal grooves, and other
conspicuous lines
_______________________________________________________________
In 20 feet
1/4 inch
In 40 feet or more
1/2 inch
Variation from level for bed joints and top
surfaces of bearing walls
_______________________________________________________________
In 10 feet
1/4 inch
In 40 feet or more
1/2 inch
Variations from horizontal lines
_______________________________________________________________
In 10 feet
1/4 inch
In 20 feet
3/8 inch
In 40 feet or more
1/2 inch
Variations in cross sectional dimensions of
columns and in thickness of walls
_______________________________________________________________
Minus
1/4 inch
Plus
1/2 inch
3.2.6
Cutting and Fitting
Full units of the proper size shall be used wherever possible, in lieu of
cut units. Cutting and fitting, including that required to accommodate the
work of others, shall be done by masonry mechanics using power masonry
saws. Concrete masonry units may be wet or dry cut. Wet cut units, before
being placed in the work, shall be dried to the same surface-dry appearance
as uncut units being laid in the wall. Cut edges shall be clean, true and
sharp. Openings in the masonry shall be made carefully so that wall
plates, cover plates or escutcheons required by the installation will
completely conceal the openings and will have bottoms parallel with the
masonry bed joints. Reinforced masonry lintels shall be provided above
openings over 300 mm 12 inches wide for pipes, ducts, cable trays, and
other wall penetrations, unless steel sleeves are used.
SECTION 04200
Page 45
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