Which ceiling type is not considered obstructed construction?

Which ceiling type is not considered obstructed construction?

• A. flat slab, pan type reinforced concrete
• B. Coffered ceiling
• C. Suspended ceiling
• D. Barrel vault ceiling

Answer: (A)

Unobstructed ceiling construction means a continuous ceiling plane without built‑in features that interrupt the spray pattern or reduce headroom. A flat slab with pan type reinforced concrete forms a smooth, uninterrupted ceiling surface—no beams, recesses, or dropped elements—so it remains unobstructed. A coffered ceiling, with its recessed panels and supporting members, breaks the ceiling into multiple planes and cavities, creating places where water spray can be deflected or blocked—obstructed. A suspended ceiling adds a secondary grid below the structural ceiling, creating a plenum and divided ceiling plane that interrupts direct spray paths—obstructed. A barrel vault ceiling, with its curved arch, changes spray trajectories and reduces clear headroom, producing shadowed or hard-to-reach areas—obstructed. So the flat slab, pan type reinforced concrete is the not obstructed option.

Unobstructed ceiling construction means a continuous ceiling plane without built‑in features that interrupt the spray pattern or reduce headroom. A flat slab with pan type reinforced concrete forms a smooth, uninterrupted ceiling surface—no beams, recesses, or dropped elements—so it remains unobstructed.

A coffered ceiling, with its recessed panels and supporting members, breaks the ceiling into multiple planes and cavities, creating places where water spray can be deflected or blocked—obstructed.

A suspended ceiling adds a secondary grid below the structural ceiling, creating a plenum and divided ceiling plane that interrupts direct spray paths—obstructed.

A barrel vault ceiling, with its curved arch, changes spray trajectories and reduces clear headroom, producing shadowed or hard-to-reach areas—obstructed.

So the flat slab, pan type reinforced concrete is the not obstructed option.