What are the four Conventional Construction Groups?

What are the four Conventional Construction Groups?

• A. Flat, Round, Spire, Dome
• B. Steel, Timber, Brick, Concrete
• C. Flat, Arch, Pitch, Sawtooth
• D. None of the above

Answer: (C)

The four Conventional Construction Groups refer to the main roof geometry categories you’ll encounter, which influence how a roof behaves under fire and how you plan ventilation and access. The four are flat, arch, pitch, and sawtooth. Flat roofs sit almost level and are common on many commercial buildings. They often hide structural members and concealed spaces, so you approach cautiously, check for parapets, and plan for potential concealed collapse. Arch roofs use a curved, barrel-like shape. The curved surface changes load paths and can create continuous, wide spans with fewer interior supports. That geometry affects how you ventilate and where you can safely cut or gain access. Pitch roofs are the typical sloped designs with rafters or trusses. The slope changes fire behavior, requires careful ladder placement and roof entry planning, and creates different ventilation paths along the slope and eaves. Sawtooth roofs consist of a series of pitched sections with vertical faces (clerestory ventilation) and are common in industrial buildings. They create complex attic spaces, skylights or glass panels, and hidden voids that can trap fire and complicate ventilation and collapse considerations. Other options mix materials or less common shapes, so they don’t represent the standard grouping used for classifying conventional roof designs in firefighting practice.

The four Conventional Construction Groups refer to the main roof geometry categories you’ll encounter, which influence how a roof behaves under fire and how you plan ventilation and access. The four are flat, arch, pitch, and sawtooth.

Flat roofs sit almost level and are common on many commercial buildings. They often hide structural members and concealed spaces, so you approach cautiously, check for parapets, and plan for potential concealed collapse.

Arch roofs use a curved, barrel-like shape. The curved surface changes load paths and can create continuous, wide spans with fewer interior supports. That geometry affects how you ventilate and where you can safely cut or gain access.

Pitch roofs are the typical sloped designs with rafters or trusses. The slope changes fire behavior, requires careful ladder placement and roof entry planning, and creates different ventilation paths along the slope and eaves.

Sawtooth roofs consist of a series of pitched sections with vertical faces (clerestory ventilation) and are common in industrial buildings. They create complex attic spaces, skylights or glass panels, and hidden voids that can trap fire and complicate ventilation and collapse considerations.

Other options mix materials or less common shapes, so they don’t represent the standard grouping used for classifying conventional roof designs in firefighting practice.