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Use these Quick Notes to help you study the fundamentals of inspecting a roof. These are highlights of information but your inspection education on the topic is not limited to just these points.
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Roofing Configuration Types:
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Roof Covering Materials:
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Asphalt shingle caps should extend 4 inches down on both sides. Architectural shingles can use cut down 3 tab or special designed ridge shingles. Siding should have 1-2 inches of clearance. Sidewall flashing should be 4” x 4”. Roll Roofing – two layers, first layer 18 inches wide face down, second layer 36 inches wide face up. Shingles cut back 3 inches from center line. Metal Flashing – 24 inches wide, center ridge 1-inch-high, nailed 18 in off-center, ideally ice and water shield 18 in each side of valley. Closed interwoven – extend 12 inches onto adjacent plane. Both cases one layer of 36-inch roofing felt paper, roll roofing, ice & water shield. |
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Flue pipe should extend no more than 5 feet above the roof deck without being secured. Skylights on a roof with less than 3/12 slope must have a 4-inch curb. Skylights should always have their own flashing. A minimum of 3 feet high, as well as 2 feet higher than any roof within 10 feet horizontally. Install crickets on chimneys 30 inches wide to divert drainage water. NRCA recommends 24 inches wide. |
Types of Chimney Flashings:
Types of Roof Ventilation:
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Roof Drainage System Specs: Gutters should slope 1/16-inch per foot towards downspout. Every square inch of downspout is capable of discharging drainage for 100 sq. ft. of roof surface 1 sq. ft. of venting per 150 sq. ft. of attic area Downspouts should direct water with proper extension 5 feet from the foundation of the home |
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