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Shingle Installation

3-17. Shingle Installation

The first step in covering a roof is to erect a scaffold to a height that will bring the eaves about waist-high to a man standing on the scaffold. Before any roof covering is applied, the roof sheathing must be swept clean and carefully inspected for irregularities, cracks, holes, or other defects. No roof should be applied unless the sheathing boards are absolutely dry. An underlay of roofing felt is first applied to the sheathing. Roofing felt usually comes in 3-foot-wide rolls and should be laid with a 2-inch top lap and a 4-inch side lap (see Figure 3-34 ). Bundles of shingles should be distributed along the scaffold before work begins. There are 27 strips in a bundle of 1 by 3 asphalt strip shingles. Three bundles will cover 100 square feet.

Figure 3-34. Laying an asphalt shingle roof
Figure 3-34. Laying an asphalt shingle roof

a. Install the first course of shingles inverted. This arrangement provides a roofing edge without notches.

b. Nail inverted shingles in place with 3/4-inch over the drip edge on the eaves and the gable ends of the roof (see Figure 3-35 ).

Figure 3-35. Applying the drip edge
Figure 3-35. Applying the drip edge

c. Snap chalk lines on the underlayment (felt) to indicate the location of each course (see Figure 3-36 ).

Figure 3-36. Snapping a chalk line
Figure 3-36. Snapping a chalk line

d. Begin the first course of shingles with a whole strip at one end of the roof (see Figure 3-37 ).

Figure 3-37. Laying the shigles
Figure 3-37. Laying the shigles

e. Cut the second course so that the lap occurs at the half-tab point (see Figure 3-37 ).

f. Use four or six nails in each shingle.

g. Use nails that are 1 1/4 inches long for new roofs.

h. Place a nail 1 inch from the edge of the shingle.

i. Place one or two nails near the tab slots (depending on the requirement) as shown in Figure 3-37 .

j. Passes each nail through two thicknesses of shingles and is concealed (blind nailed) by the next course of shingles.

k. Finish the ridge of the roof by overlapping the shingles to prevent the roof from leaking.

l. Make three short 12- by 12-inch shingles from a 12- by 36-inch shingle for the ridge of the roof

m. Lay short shingles with an exposure of 5 inches to the weather.

 
Curriculum design: David L. Heiserman
Publisher: SweetHaven Publishing Services

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