_By referring to pages 25 and 26, it will be seen that four courses
of brick with a 3/8-inch joint equal in height two 5" × 12" tile,
so that, in our present example, if we wish to use the 3/8-inch
joint, we shall have to introduce our bonding course of brick every
fifth instead of every sixth course. This would also naturally
involve a slight change in the number of face brick required. That
is, instead of adding 16-2/3% or we should have to add 20% or
1/5 to the number required for Running Bond, in order to get the
right number for fifth course Common Bond and, in consequence, we
subtract 20% or one fifth from the backing tile wanted. With these
changes understood, our problem for a hollow tile backing for the
gable wall will work out as follows:_
If the hollow tile backing is started at grade, the tile and face
brick area will be the same. But as, in the present case, we start
the tile backing from the first floor, we subtract the area of the
wall from grade to first floor or 25' × 3' = 75', and get 517 - 75
or 442 sq. ft. to be backed with tile.
The closures for horizontal tile are figured separately. A full
and a half closure are respectively 12 and 6 inches in length and
amount to about one foot in height, and hence cover an area of 3/4
sq. ft. on each side or 1-1/2 sq. ft. on both sides of the opening.
As the height of our five window openings is approximately 25 feet,
we have 25 × 1-1/2 = 37-1/2 sq. ft. to be deducted from area of
regular tile surface, giving 442 - 37-1/2 or 404-1/2 sq. ft.
As per coefficient table, page 106,
we have 404.5 × 2.15 = 870
Deduct 1/5 of tile for brick bond 174
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696
Add 3% for wastage or 21
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=Total number of tile to be ordered= 717
Requiring 4 closures, 2 full and 2
half, for each foot of height (both
sides), we need 25 × 4 or 100 closures
Add 3% for wastage or 3
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=Total number of closures needed= 103
Order 52 of each size.
Brick-size tile, 12 to every 16 sq. ft.
needed. Hence, 442 ÷ 16 gives about
28, and 12 × 28 = 336
Add 3% for wastage or 10
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=Total brick-size tile to be ordered= 346