Rooftop terminations shall be arranged with or provided with the following: The collection container for drainage must be noncombustible, _______, _______, and structurally sound for the service to which it is applied and that will not sustain combustion.

Rooftop terminations shall be arranged with or provided with the following: The collection container for drainage must be noncombustible, _______, _______, and structurally sound for the service to which it is applied and that will not sustain combustion.

• A. Liquidtight, Rainproof
• B. Welded, Waterproof
• C. Closed, Grease-Tight
• D. Closed, Rainproof

Answer: (D)

The main idea is that rooftop drainage containers must be built to be safe in a weather-exposed, fire-prone area. They should be made of noncombustible material and designed as a closed, rainproof enclosure that is structurally sound for the service it supports and will not sustain combustion. The two required qualifiers describe the enclosure: it should be closed so no vapors, odors, or pests escape and so accidental openings are avoided, and rainproof so precipitation cannot enter the container and compromise the contents or the structure. Noncombustible construction and structural soundness further ensure the unit won’t ignite or fail under service loads. Other descriptors like liquidtight, welded, or grease-tight are not the standard combination needed for rooftop drainage containers in this context.

The main idea is that rooftop drainage containers must be built to be safe in a weather-exposed, fire-prone area. They should be made of noncombustible material and designed as a closed, rainproof enclosure that is structurally sound for the service it supports and will not sustain combustion. The two required qualifiers describe the enclosure: it should be closed so no vapors, odors, or pests escape and so accidental openings are avoided, and rainproof so precipitation cannot enter the container and compromise the contents or the structure. Noncombustible construction and structural soundness further ensure the unit won’t ignite or fail under service loads. Other descriptors like liquidtight, welded, or grease-tight are not the standard combination needed for rooftop drainage containers in this context.