Firesound™ is a premium quality, flexible water-based construction sealant formulated to perform as a barrier to the passage of both fire and sound through construction joints and service penetrations in concrete, aerated concrete, block work, brickwork and fire-rated plasterboard.

Check certification requirements or consult the relevant certifying authority before use in a fire rated application.

Key Benefits

  • Premium quality, flexible construction sealant accommodating up to ±20% joint movement
  • Fire rated for up to 4 hrs in joints up to 50 mm when tested in accordance with AS1530.4
  • Intumescent; expands to compensate for deflection of building elements that result from exposure to extreme heat or fire
  • Non-hazardous, free from solvents, isocyanates and asbestos
  • Excellent acoustic performance; low shore A hardness and high density formula achieving up to Rw 65 (-2;-5) when tested in accordance with AS1276.1
  • Low VOC Green star project compliant sealant, 31g/L (SCAQM Rule 1168.)
  • Paintable
  • UV Stable


  • Sealing exterior and interior construction joints that are subject to movement (up to ±20%) in pre-cast concrete panels, block work, brickwork, aerated concrete and fire-rated plasterboard
  • Gaps around cables, metal pipes, conduits and busways that penetrate walls, floors and ceilings

Compatible Substrates

  • Concrete
  • Aerated concrete
  • Mortar
  • Brick
  • Masonry
  • Fire rated plasterboard
  • Aluminium
  • Steel inc. stainless
  • Zinc/galvanised steel
  • Cable coverings (PVC)


SKU 3297286
Brand HB Fuller

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