Table 4-5. - Quantities of Material Required for Brick Walls

The following example shows the square foot method of estimating the number of bricks for a 4-inch wall measuring 8 feet high and 14 feet long. Specifications call for the use of US. standard brick with a 1/2-inch mortar joint. The brick face with its mortar joints measures 2 3/4 inches high by 8 1/2 inches long. The correct steps to follow are:

Step 1. Find the surface area by multiplying the height and the length of a brick (include mortar joint). In this case, 2 3/4" x 8 1/2= 2.75 x 8.50= 23.38 sq in. per brick.

Step 2. Find the number of bricks per square foot of wall. In this case, the number of brick is 6. 16/sq ft for a 4-inch wall.

Step 3. Find the area of the brick wall by multiplying its height by its length. 8 ft x 14 ft = 112 sq ft.

Step 4. Then multiply the area of the wall by the number of bricks per square foot. In this case, 112 x 6.16 or 690 bricks plus 10% waste which equals 760 brick.

NOTE:

If there are windows, doors, and other openings on the wall, you subtract the area of these openings from the overall area of the wall to get the net area. Then in step 4, you multiply the number of bricks per square foot by the net area.

In finding how much mortar is required to build this wall, divide the number of bricks by 1,000, then multiply the result by the factor given in table 4-5 and allow 20% for waste. See the following formula:

760 ÷ 1000 = .76

.76 x 11.7 (cf of mortar/1000 brick) = 8.90 cf of mortar

8.90 x 20% (waste) = 10.68 or 10.7 CF of mortar

Therefore to construct this wall with U.S. standard brick with a 1/2-inch mortar joint, you require 760 brick and 10.7 CF of mortar.

Hollow masonry units, made of burned clay or shale, are called variously structural tiles, hollow tiles, structural clay tiles, structural clay hollow tiles, and structural clay hollow building tiles, but they are most commonly called building tile. In building tile manufacture, plastic clay is pugged through a die, and the shape that emerges is cut off into units. The units are then burned much as bricks are burned.

The apertures in a building tile, which correspond to the cores in a brick or a concrete block, are called CELLS. The solid sides of a tile are called the SHELL, and the perforated material enclosed by the shell is called the WEB. A tile that is laid on one of its shell faces is called a SIDE-CONSTRUCTION tile; one that is laid on one of its web faces is called an END-CONSTRUCTION tile. Figures 4-21 and 4-22

Figure 4-21. - Standard shapes of side-construction building tiles.

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