How many gallons of primer and paint are needed to paint the walls of the residence shown in Figure 16.18? The walls are to receive one coat of primer and two coats of paint. The exterior walls only need paint on the interior sides. The walls are 8 feet high. One gallon of primer will cover 275 square feet and one gallon of paint will cover 350 square feet with a single coat. The swinging doors are 3 feet wide by 6 feet 8 inches high, the closet doors are 6 feet wide by 6 feet 8 inches high, and the windows are 4 feet high.
What will be an ideal response?
The quantity of paint and primer is calculated as follows:
Exterior wall length = 32? + 26? + 36? + 13?6? + 4? + 12?6? = 124?
Interior wall length = 12?10? + 19?4? + 16?4? + 3.5? + 8?9? + 11?9? + 3 × 2?1? + 3 × 8?4? = 100?6?
Gross area of wall = (124? + 2 sides × 100?6?) × 8? = 2,600 sf
Area of doors = 4.5 doors × 2 sides × 3? × 6?8? + 3 doors × 2 sides × 6? × 6?8? = 420 sf
Area of windows = 5? × 4' + 3? × 4' + 4 windows × 4? × 4? = 96 sf
Net area of wall = 2,600 sf – 420 sf – 96 sf = 2,084 sf
Gallons of primer = 2,084 sf / 275 sf per gallon = 7.6 gallons – Order 8 gallons
Gallons of paint = 2 coats × 2,084 sf / 350 sf per gallon = 11.9 gallons – Order 12 gallons
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