FAQs
Intumescent strips are fire safety components fitted into the edges of fire doors or frames. In the event of a fire, the strip expands when exposed to heat, sealing gaps around the door to prevent the spread of fire and smoke. They are essential for maintaining the fire rating of FD30 and FD60 fire doors.
When temperatures rise during a fire, the intumescent material reacts and expands many times its original size. This expansion seals the gap between the door leaf and frame, helping to contain flames, heat, and smoke for the certified duration of the door’s fire rating.
Yes, intumescent strips are a critical part of a certified fire door set. Without correctly specified and installed strips, a fire door may not meet UK Building Regulations or maintain its FD30 or FD60 certification.
Intumescent strips are available in various sizes, colours, and configurations, including:
- Standard fire-only strips
- Combined fire and smoke seals
- Rebated or surface-mounted options
- Different widths (e.g., 10mm, 15mm, 20mm) depending on door specification
In many cases, intumescent strips can be retrofitted to existing fire doors, provided the door and frame are suitable. However, installation must follow manufacturer instructions to ensure the fire door’s certification and performance are not compromised.
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