Which materials are typically used in firestop systems?

Firestop systems are specifically designed to prevent the spread of fire, smoke, and gases through openings in fire-resistance-rated walls and floors. The appropriate materials used in these systems play a crucial role in achieving effective fire containment.

The correct choice identifies caulks, seals, pillows, mortars, and intumescent strips as common materials used in firestop systems. Each of these materials contributes uniquely to fire safety:

• Caulks and seals provide a flexible barrier that can accommodate movement while maintaining a seal against smoke and flames.

• Pillows are often used in large openings and can be removed or adjusted as necessary, making them versatile for various applications while still offering fire protection when needed.

• Mortars are used for filling gaps and are particularly effective in larger voids. They can harden to form a durable seal that withstands high temperatures.

• Intumescent strips react to heat by expanding and forming a char layer that insulates and blocks openings, effectively slowing or preventing the passage of fire and smoke.

This range of materials is tailored to meet specific firestop application needs, providing both mechanical and thermal barriers. By utilizing a combination of these materials, a firestop system can maintain its integrity