FIREFLY® Roof Cavity Closer – Chamfered 1200 × 300mm (30°, 45° & 60°)-1
FIREFLY® Roof Cavity Closer – Chamfered 1200 × 300mm (30°, 45° & 60°)-2
FIREFLY® Roof Cavity Closer – Chamfered 1200 × 300mm (30°, 45° & 60°)-3
FIREFLY® Roof Cavity Closer – Chamfered 1200 × 300mm (30°, 45° & 60°)-4
FIREFLY® Roof Cavity Closer – Chamfered 1200 × 300mm (30°, 45° & 60°)-5

FIREFLY® Roof Cavity Closer – Chamfered 1200 × 300mm (30°, 45° & 60°)

£82.76

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🔵 Technical Resources

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The FIREFLY® Roof Cavity Closer – Chamfered is a fire-tested roof void closing solution, purpose-designed to accommodate pitched roof geometries where a standard square-edge closer is unsuitable. Manufactured from FIREFLY® FB180 Ablative Batt with a factory-bonded intumescent graphite strip, it provides certified fire compartmentation at roof eaves and gable interfaces.

The chamfered profile allows close contact with angled roof constructions, ensuring consistent void closure between the roof membrane and outer tiles or sheeting. When exposed to fire, the graphite strip expands to seal remaining gaps, preventing fire and smoke spread through roof-level voids.

Installed below the membrane, the chamfered Roof Cavity Closer eliminates the need to remove tiles or disrupt waterproofing, making it ideal for both new-build and retrofit projects. It supports compliance with Building Regulation Part B and removes the requirement for a 1500mm-wide protected “umbrella zone” at compartment lines.

Available Chamfer Options

  • 1200 × 300mm – 30° chamfer

  • 1200 × 300mm – 45° chamfer

  • 1200 × 300mm – 60° chamfer

(Vertical application only)

Key Features

  • Fire-tested solution for roof eaves and cavity compartmentation

  • Chamfered profile suits pitched and angled roof constructions

  • Tested as a system to BS EN 1363-1:2020

  • Intumescent graphite expands to seal roof-edge voids in fire

  • Installed below membrane – no need to remove tiles or cut membranes

  • Enables compliance without a 1500mm protected umbrella zone

  • Compatible with FIREFLY® barriers, FB180 Batt, timber, blockwork & plasterboard

Construction & Materials

  • FIREFLY® FB180 mineral fibre ablative batt

  • Factory-bonded intumescent graphite strip

  • White mineral fibre finish with dark graphite edge

Installation Guidance

  • Friction-fit into roof cavity void

  • All edges must be buttered and sealed using FIREFLY® FR Intumescent Acrylic Sealant

  • Install in accordance with FIREFLY® Drawings 017 & 018

  • Vertical use only

Dimensions

  • 1200 × 300 × 50mm

  • Chamfer angles: 30° / 45° / 60°

Storage & Handling

  • Store in a cool, dry location

  • Protect from rain and frost

  • Supplied bagged for transit and site protection

Compliance & Testing

  • Tested as part of a FIREFLY® system to BS EN 1363-1:2020

  • Supports compliance with UK Building Regulations – Approved Document B

  • Fully tested and third-party certified under application

🔵 Technical Resources

📁 Downloads (Click to expand)