CCI Roofing & Weatherproofing Standards 3

Question 1

Per IRC Section R905.1.1, what is the minimum slope requirement for asphalt shingles when double underlayment is not used?

Accepted Answer

3:12

Answer

IRC requires a minimum 3:12 slope for standard asphalt shingle installation without the additional protection of double underlayment.

Question 2

What is the term for the upward deflection of a roof membrane or panel caused by differential air pressure between the interior and exterior of a building?

Accepted Answer

Wind uplift

Answer

Wind uplift occurs when wind creates a pressure differential that exerts an upward force on roof membranes or panels, potentially causing separation.

Question 3

A CCI inspector finds that modified bitumen roofing membrane laps are only 2 inches wide. What is the correct minimum lap width per industry standards?

Accepted Answer

6 inches

Answer

Modified bitumen membrane side laps and end laps require a minimum 6-inch overlap to ensure a watertight seal.

Question 4

Which ASTM standard governs the testing of asphalt shingles for physical properties including wind resistance?

Accepted Answer

ASTM D3462

Answer

ASTM D3462 is the standard specification for asphalt shingles made from glass felt and surfaced with mineral granules, including wind resistance testing.

Question 5

When inspecting roof drainage, what is the maximum allowable area of roof that one 4-inch diameter drain can typically serve under IPC standards?

Accepted Answer

2,000 sq ft

Answer

Under IPC guidelines, a single 4-inch roof drain can typically serve up to 2,000 square feet of roof area based on standard rainfall intensity calculations.

(CCI) Certified Construction Inspector Practice Test

(CCI) Certified Construction Inspector Practice Test

CCI Roofing & Weatherproofing Standards 3