Which of the following materials is not suitable for smoke barriers?

Smoke barriers are designed to limit the movement of smoke within a building during a fire, and they require materials that are non-combustible or have a low propensity to ignite and contribute to the spread of flames.

The choice of wood beams is not suitable for smoke barriers because wood is a combustible material. When exposed to fire, wood can ignite and burn, allowing smoke to pass through and compromising the effectiveness of the barrier. In contrast, metal studs, concrete blocks, and gypsum board are all non-combustible or have fire-resistant properties that help contain smoke and resist ignition. Metal studs can withstand high temperatures without contributing to the spread of fire, while concrete blocks provide a robust, non-combustible option. Gypsum board also has built-in fire-resistant characteristics, making it an appropriate choice for use in smoke barriers.

Understanding the characteristics of these materials helps ensure that smoke barriers function effectively, which is crucial for safety standards in building design and construction.