3.19
SPLASH BLOCKS
Splash blocks shall be located as shown.
3.20
POINTING AND CLEANING
After mortar joints have attained their initial set, but prior to
hardening, mortar and grout daubs or splashings shall be completely removed
from masonry-unit surfaces that will be exposed or painted. Before
completion of the work, defects in joints of masonry to be exposed or
painted shall be raked out as necessary, filled with mortar, and tooled to
match existing joints. Immediately after grout work is completed, scum and
stains which have percolated through the masonry work shall be removed
using a high pressure stream of water and a stiff bristled brush. Masonry
surfaces shall not be cleaned, other than removing excess surface mortar,
until mortar in joints has hardened. Masonry surfaces shall be left clean,
free of mortar daubs, dirt, stain, and discoloration, including scum from
cleaning operations, and with tight mortar joints throughout. Metal tools
and metal brushes shall not be used for cleaning.
3.20.1
Concrete Masonry Unit and Concrete Brick Surfaces
Exposed concrete masonry unit and concrete brick surfaces shall be
dry-brushed at the end of each day's work and after any required pointing,
using stiff-fiber bristled brushes.
3.20.2
Clay or Shale Brick Surfaces
Exposed clay or shale brick masonry surfaces shall be cleaned as necessary
to obtain surfaces free of stain, dirt, mortar and grout daubs,
efflorescence, and discoloration or scum from cleaning operations. After
cleaning, the sample panel of similar material shall be examined for
discoloration or stain as a result of cleaning. If the sample panel is
discolored or stained, the method of cleaning shall be changed to assure
that the masonry surfaces in the structure will not be adversely affected.
The exposed masonry surfaces shall be water-soaked and then cleaned with a
solution proportioned 30 mL 1/2 cup trisodium phosphate and 30 mL 1/2 cup
laundry detergent to 1 L one gallon of water or cleaned with a proprietary
masonry cleaning agent specifically recommended for the color and texture
by the clay products manufacturer. The solution shall be applied with
stiff fiber brushes, followed immediately by thorough rinsing with clean
water. Proprietary cleaning agents shall be used in conformance with the
cleaning product manufacturer's printed recommendations. Efflorescence
shall be removed in conformance with the brick manufacturer's
recommendations.
3.21
BEARING PLATES
**************************************************************************
NOTE: The bearing details must be shown on the
drawings. The thermal effects must be considered
for steel beams bearing on masonry to prevent
cracking of masonry walls due to thermal expansion
of steel framing members.
**************************************************************************
Bearing plates for beams, joists, joist girders and similar structural
members shall be set to the proper line and elevation with damp-pack
bedding mortar, except where non-shrink grout is indicated. Bedding mortar
SECTION 04200
Page 57
Previous Page
