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An intumescent seal is a fire-resistant strip installed in window and door frames that expands dramatically when exposed to high heat-sealing gaps to prevent the spread of flames, smoke, and toxic gases.
Made from graphite-based compounds, these seals remain inert under normal conditions but activate at around 200–250°C, forming a char barrier that maintains compartmentation during a fire.
In heritage timber windows, slim-profile intumescent seals can be discreetly integrated into meeting rails or parting beads to meet fire safety requirements (e.g., for flats or protected escape routes) without compromising aesthetics or operation.
U-value
U-value measures how effectively a window resists heat transfer-the lower the U-value, the better the insulation. Expressed in W/m²K (watts […]
Fixed window
A fixed window serves as a stationary glazed panel which allows maximum sunlight entry while providing expansive view access but […]
Conservation area
A Conservation Area represents a special designation which local planning authorities in the UK assign to areas that show exceptional […]
