Real-Life Math -- Solution
1. What is the area
of the roof? How many bundles of shingles will you need?
44 feet
long x 15 feet wide x 2 sides = 1,320
The area of the roof is 1,320
square feet.
1,320 square feet / 33 square feet per bundle = 40
bundles
You'll need 40 bundles of shingles.
2. What
is the length of the roof's perimeter? How many bundles of starter will
you need?
Perimeter = (44 feet long x 2 sides) + (15 feet wide x
4 sides)
Perimeter = 88 + 60
Perimeter = 148
The
length of the roof's perimeter is 148 feet.
148 feet / 69 feet
per bundle of starter = 2.14
You'll need 3 bundles of starter
(there'll be some left over).
3. What is the length of the roof
peak? How many bundles of capping will you need?
The roof peak is 44 feet
long.
44 feet / 28 feet per bundle of capping = 1.57
You'll
need 2 bundles of capping. Again, you'll have some left over.
Before
any job, roofers need to write an estimate of what it will cost. This job
is done by the roofing company's more experienced employees.
"If
you're going to do the estimating, [math skills] are quite important,"
says roofer Garry O'Farrell. "For the ordinary employee, just shingling
and that, it's not of great importance."
Beginner roofers need
math skills for measuring. Once they gain experience, they also do calculations
for estimates.