clearing. The dozer will operate in first gear at $2\mathrm{.}3mph$ during clearing.

It will cost $$1,500$ to transport the dozer to and from the job. The hourly cost of the dozer

with operator is $$\frac{130\mathrm{.}00}{h}r.$ Assume a $45-$min. effective hour and estimate the total time and

cost$,$ and the cost per acre for clearing.

FOUNDATIONS

$9\mathrm{.}2$ Estimate the total cost and cost per lineal foot for furnishing and driving $108$ creosote$-$

treated wood piles to full penetration into soil having high frictional resistance. The piles

will be $36ft$ long, with $14-$in$.$ minimum diameters at the butt and $6-$in$.$ minimum diameter at

the tip. The tip of each pile will be fitted with a metal point to facilitate driving. Use the cost

information in Example $9\mathrm{.}3$

ROOFING

Estimate the total cost and the cost per square for furnishing and laying three$-$tab asphalt

shingles on a wood roof decking whose area is $4,800sf($add $5\%$ waste$).$ The roof will have

numerous valleys, hips, and dormers. Assume materials cost $$\frac{3\mathrm{.}40}{?}$ square for the felt,

$$\frac{55\mathrm{.}00}{?}$ square for shingles, and $$\frac{1\mathrm{.}45}{l}b$ for nails. The labor cost includes $$\frac{28\mathrm{.}00}{h}r$ for

carpenters $$\frac{21\mathrm{.}00}{h}r$ for laborers, and $$\frac{21\mathrm{.}00}{h}r$ for helper for felt.

TABLE $13\mathrm{.}2$ I Labor$-$hours required to lay a square

of asphalt shingles, using carpenters.