when the nominal thickness of the prefaced concrete masonry units is the
same as the total indicated nominal thickness of the facing tile plus the
backing. Prefaced concrete masonry units shall conform to ASTM C 744 using
masonry units conforming to ASTM C 90. The facing shall turn over the
edges and ends of the unit at least 10 mm 3/8 inch in the direction of the
thickness of the unit to form a lip at least 2 mm 1/16 inch thick.
Variation in color and texture shall not exceed that of the approved
samples. All shapes and sizes shall be provided for a complete
installation. Bullnose units shall be used along sills and caps and at
vertical external corners including door jambs, window jambs, and other
such openings. Radius of the bullnose shall be 25 mm 1 inch. Base units
shall be coved to meet finished floor surfaces where ceramic tile floor
occurs.
2.4
MORTAR AND GROUT
**************************************************************************
NOTE: This section does not provide for specialized
mortar uses such as chimney, structurally reinforced
masonry, and acid resistant mortars.
**************************************************************************
2.4.1
Mortar
ASTM C 270, Type S or N, Type I portland cement, Type IP blended hydraulic
cement, or masonry cement, standard gray in color [, except provide white
portland cement shall be used for pointing mortar in [_____]]. Proportion
to the requirements of Table 1, ASTM C 270. Admixtures containing calcium
chloride, antifreeze liquids or salts will not be permitted.
2.4.2
Grout
**************************************************************************
NOTE: Use fine grout for spaces less than 100 mm (4
inches) wide. Use coarse grout for spaces between
100 and 150 mm (4 and 6 inches). Over 150 mm (6
inches) concrete may be used.
**************************************************************************
ASTM C 476, [fine] [coarse], portland cement Type I or blended hydraulic
cement Type IP.
2.4.3
Non-Staining, Chemical Resistant Grout
**************************************************************************
NOTE: Use for food preparation areas, toilet rooms,
and any areas subject to graffiti.
**************************************************************************
ANSI A108.1.
[2.4.4
Colored Mortar
**************************************************************************
NOTE: Indicate location of colored mortar. Delete
if colored mortar not used.
**************************************************************************
Provide mortar coloring materials consisting of inorganic compounds in the
SECTION 04215
Page 8
Previous Page
