Estimating in Building Construction

124 CHAPTERELEVEN

Openings

Waste@ 6 percentUse 958 blocks

Number of blocks903 blocks

Number of blocks 803 sf1.125 blocks per sf

Using an 8 –  8 –  16 – block1.125 blocks per sf

Net west wall area 908  84  21 803 sf

Area of openings 84 sf 21 sf 105 sf

Doors 1 @ 3 ¿ 7 ¿ 21 sf

Windows 4 @ 3 ¿ 7 ¿ 84 sf

Header/Lintel Blocks

From Figure 11.10, the labor hours can be determined.

65 header blocks

893  8  8 16 blocks

For west wall purchase

Plain block 958  45  20 893 blocks

5 openings 20 blocks

Windows>doors 4 per opening

Top course 59 ¿ 3 – > 16 –  45 blocks

FIGURE 11.9.Wall Section.

FIGURE 11.10.Labor Hours Required for Concrete Masonry.