_Dimensions of
Tile Face_ _Coefficient_
4" × 12' 2.6
5" × 12' 2.15
12" × 12" 0.94
As the face brick is bonded to the tile backing by a double header
bonding course, as shown on page 25, the amount of tile will have
to be reduced accordingly. For instance, if 12" × 12" tile are
used, the bonding course occurs every sixth course and one-sixth of
the tile should be deducted, but at the same time, there must be
added brick-size hollow tile at the rate of 12 to every 20 square
feet of wall surface for use behind the stretchers in the bonding
courses.
Or, if 5" × 12" tile are used, the bonding course occurs every
fifth course and one-fifth of the tile should be deducted, and
brick-size hollow tile at the rate of 12 to every 16 square feet of
wall surface should be added for use behind the stretchers in the
bonding courses. When the backing is 8 inches thick, an additional
course of brick-size tile should be calculated behind every bonding
course. If the brick-size tile cannot be obtained in the local
market, an equal number of common brick will answer the purpose
just as well. Two to three per cent should be added to all tile
quantities calculated, to provide for waste.
In giving the following examples of estimating quantities it is not
meant to indicate that each wall of the house is necessarily to be
estimated by itself, but simply to show the way of estimating any
extent of wall. Except in very elaborate and diverse elevations,
the best way is to figure on the total surface of the four sides in
one operation. This is the more easily done as, generally speaking,
opposite sides of the house are of like area.