What Are Intumescent Strips?

An intumescent strip is chemically designed to expand when exposed to extreme heat. Usually placed around door frames. Once a fire breaks out in a room, the heat causes the strip to expand and seal the gap around the frame to contain the fire.

Is an intumescent strip a smoke seal?

Intumescent strips are similar to smoke seals, but they're designed to protect from fire itself as opposed to smoke. This is generally why both are necessary for full compliance with regulations. Intumescent strips have a different composition, as they're designed to expand in response to high temperatures.

Do fire doors need intumescent strips?

The Building Regulations indicate where you have fire doors, these would require intumescent strips. ... If the gap is too wide, it may compromise the door's ability to restrict the spread of fire and smoke.