_Common_ (full header course
every 5th course) 20% (1/5)
_Common_ (full header course
every 6th course) 16-2/3% (1/6)
_Common_ (full header course
every 7th course) 14-1/3% (1/7)
_English or English Cross_ (full
headers every 6th course) 16-2/3% (1/6)
_Flemish_ (full headers every 6th
course) 5-2/3% (1/18)
_Double Header_ (two headers and
a stretcher every 6th course) 8-1/3% (1/12)
_Double Header_ (two headers and
a stretcher every 5th course) 10% (1/10)
For garden walls, porch walls, and other places where an 8-inch
wall is used, with face brick on both sides, no additional brick
are required for any type of bond.
For walks and floors where the brick are laid on edge, in any
pattern except diagonal ones, calculate as you would for the number
of face brick in a wall laid in running bond. For her- ring-bone
pattern or other diagonal work, an additional number of brick will
be required to compensate for the clipping of the ends of the brick
at the borders. The exact additional amount depends on the total
width of the walk or floor, as the wider the surface the smaller
will be the average wastage per square foot. Walks and floors where
the brick are laid flat require one-third less than the number
required where the brick are laid on edge.
Provided with these tables, it is a simple matter to calculate the
number of face brick required for every job.
Thus, estimate the total area of wall surface in square feet,
deduct all openings, except those 10 square feet or less, and
taking into consideration the mortar joint, multiply the result
by the number of brick per square foot as shown in Table 1. This
will give you the number required for Running Bond. For other bonds
simply add to the number of brick obtained for Running Bond the
percentages as given in Table 2. Soldier courses make no difference
in the count; nor do rowlock courses, if half brick only are used.
Although window sills laid rowlock fashion require additional
brick, these are amply provided for in the usual allowances for
wastage.
[Sidenote: Wastage]
If the workmen are careful to use bats for closures, instead of
breaking whole bricks, no waste need be figured. The area of the
small openings, not deducted in figuring quantities, and the
doubling of brick at the corners, will give a certain number of
extra brick; and, as it is the usual custom to order the brick to
the quarter-thousand next above the actual number figured, the
ordinary wastage on the job will be provided for.
If the number of square feet of face brick where there is no common
brick or tile backing, such as chimneys, porch walls, steps,
floors, etc., is kept separated from the number of square feet of
face brick with backing, then the latter number of square feet,
once obtained, may be used in figuring the number of common brick
or tile required for backing, thus saving the contractor time in
estimating.