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Internal Roof Fire Barrier

Product 129


Internally-fitted fire break to protect partition walls under roof slates or tiles between adjoining properties

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£0.00 ex. Vat


Internal Roof Barrier

An intumescent-coated Internal Roof Fire Barrier. Designed with 1220mm-wide glass cloth curtain and 1000mm-wide fireproof sponge barrier. Forms a fire break between two roofs of adjoining properties. Ideal for use in terraced as well as semi-detached houses, or areas with large roof spans.#

Installed internally within the loft space. Additionally, maintains the integrity of existing weatherproofing. See also Product 128 – External Roof Fire Break Membrane.

  • Also, unaffected by moisture.
  • Furthermore, quick and easy to install on all roof designs.

Tested to BS476 Part 22 (1987), achieving 81 minutes of integrity and 22 minutes of insulation. Provides both Class 0 and Class 1 spread of flame protection.

Fire barriers provide an effective solution for rooms or areas within buildings that need fire protection. Browse our full range Fireproof Barriers and Membranes for Protecting Roofs and Thatch online.

Envirograf ® passive fire products carry the hallmark of excellence, reflecting the high standards that prevail in its laboratory, test rig, and manufacturing plant. Envirograf® passive fire products are subject to rigorous quality control which, at all stages, ensures products remain at the leading edge of fire containment technology. This quality has earned the company and its passive fire products a high reputation. With its operating system accredited to ISO9001.


– Offers full smoke protection and up to 81 minutes fire protection

– Quick and easy to install on all roof designs

– Provides both Class 0 and Class 1 spread of flame protection

– Maintains integrity of existing weatherproofing

Application Instructions

Only one side of a house needs to be sealed; one side of a semi-detached house or one side of a terraced house, next to the party wall. Cut the existing roofing felt next to the party wall and up to the first truss away from the wall. This can be discarded. Using supplied intumescent adhesive, adhere the fireproof sponge between theb battens, filling the gap between the top of the party wall and the underside of the tiles or slates. Apply a coating of the adhesive to the truss. Adhere the fire barrier curtain to the truss, ensuring that the coloured side is upward. Fix the battens over the fire barrier curtain and nail to the truss with 30mm clout nails. Apply adhesive to the underside of the tile battens to help hold up the fire barrier curtain, then apply adhesive to the wooden truss, near to the party wall or to the wall itself. Stretch the fire barrier curtain under the tile battens, over to the truss or wall and press onto the applied adhesive. Fix the batten with 30mm clout nails through the fire barrier curtain, into the truss or wall. The fire barrier curtain can be installed in sections, starting from the eaves downward, with an overlap joint of 50mm. Adhere the overlap joint with supplied intumescent adhesive.

Order References / Sizes

Ref         Curtain Size (WxL)

IRB        1220mm x 1000mm

Above order reference includes sufficient adhesive and battens to fix the fire barrier curtain, plus one 30mm x 30mm x 1000mm length of fireproof sponge.