Roof Cavity Closer

Providing a fire-tested solution to close the void between roof membrane and tile at compartment lines, FIREFLY® Roof Cavity Closer is a specially manufactured combination of Ablative Batt & Intumescent Graphite.

USE AREAS The FIREFLY® Roof Cavity Closer is designed to extend the compartmentation line all the way through the roof membrane to the outer tile/sheet. It is installed below the membrane and features a bonded intumescent graphite strip that will expand to fill the void to the outer tiles in the event of a fire. FIREFLY® Roof Cavity Closer can be used when installing a FIREFLY® Barrier or a FB180 Batt system, in order to provide a tested and certified solution. CONSTRUCTION Manufactured using FIREFLY® FB180 Ablative Batt and an intumescent graphite layer bonded to the narrow edge of the Batt. Supplied in cut sizes suitable for intended applications, but can be further trimmed to size on site.

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APPLICATION
The FIREFLY® Roof Cavity Closer should be friction-fitted into the void and edges “buttered” and sealed with FIREFLY® FR Intumescent Acrylic. Consult drawings on the FIREFLY® website for full installation detail for various scenarios

KEY BENEFITS

Provides a practical fire-stopping solution to meet the requirements of Building Regulation Part B to close the void between roof membrane and outer tiles
Extends compartment fully to the exterior skin of the building
FIREFLY® Roof Cavity Closer achieves compliance without the need to provide a 1500mm wide protected zone (or “umbrella zone”) either side of the compartment line
Sits below the membrane, so no need to remove tiles or cut membrane to
fit – perfect for retrofit
Can be used in conjunction with various materials within the compartment wall; including FIREFLY® flexible fire barriers, FIREFLY® FB180 Ablative Batt, timber, plasterboard and block/brickwork
Suitable for use both perpendicular and parallel to the gable end
Tested to the requirements of BS EN 1363-1:2020 and provides a tested & certified solution as part of a FIREFLY® system

TITLE
FIREFLY® Roof Cavity Closer

DESCRIPTION
Mineral fibre ablative batt with bonded graphite strip for use with FIREFLY® systems

TESTING
Tested as a system against the requirements of BS EN 1363-1:2020

CERTIFICATION
Fully tested with 3rd party certification under application

APPLICATION
Vertical use only

PROPERTIES
Layered mineral fibre, ablative coating on both sides, white appearance with intumescent graphite strip

DIMENSIONS
1200 x 150 x 50mm, 600 x 150 x 50mm (stocked) 1200 x 400 x 50mm, 1200 x 300 x 50mm, 600 x 400 x 50mm, 600 x 300 x 50mm (made to order)

PACKAGING
Supplied bagged to provide protection in transit and on site. Do not allow the batt to be exposed to rain
Storage: cool, dry place – protect from frost

We get very good technical guidance from FIREFLY® and were on site for approximately a week, installing some 80 metres of FIREFLY® Cavity Closer, as well as coating the timbers with FIREFLY® intumescent paint.

Ian Cross,
Contract Manager, Meldrum Fire Engineering