A second roof constructed over an existing roof is commonly called what?

• A. Solid-Core Door
• B. Rain or Snow Roof
• C. Reinforced concrete
• D. Ridge

Answer: (B)

A second roof built over an existing roof is commonly called a rain roof or snow roof. The idea is that the outer roof sheds rain or snow while concealing the underlying roof, creating a hidden space between layers. In firefighting, that concealed space can trap heat and fire, complicating ventilation and increasing collapse risk, so recognizing this condition guides strategies for ventilation and search. The other terms don’t fit this scenario: a solid-core door is unrelated to roofing, reinforced concrete is a material, and a ridge is simply the top edge of a roof.