Masonry 131that does get in back to the outside of the building. Flashing
may be required under sills and copings, over openings for
doors and windows, at intersections of roof and masonry
wall, at floor lines, and at the bases of the buildings (a little
above grade) to divert moisture. Materials used include cop-
per, aluminum, copper-backed paper, copper and polyethyl-
ene, plastic sheeting (elastomeric compounds), wire and
paper, and copper and fabric. Check the specifications to
determine the type required. The drawings and specifica-
tions must also be checked to determine the locations in
which the flashing must be used. Flashing is generally sold by
the square foot or by the roll. A great deal of labor may be
required to bend metal flashing into shape. Check carefully
as to whether the flashing is to be purchased and installed
under this section of the estimate, or whether it is to be pur-
FIGURE 11.16.Reinforcement Layout.
(Courtesy of Dur-O-Wall)chased under the roofing section and installed under the
masonry section.Weep Holes. In conjunction with the flashing at the base
of the building (above grade level), weep holes are often pro-
vided to drain any moisture that might have gotten through
the outer wythe. Weep holes may also be required at other
locations in the construction. The maximum horizontal
spacing for weep holes is about 3 feet, but specifications
often require closer spacing. The holes may be formed by
using short lengths of cord inserted by the mason or by well-
oiled rubber tubing. The material used should extend
upward into the cavity for several inches to provide a
drainage channel through the mortar droppings that accu-
mulate in the cavity.