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L4.T1. Regulatory Requirements – Building Regulations

Approved Document B

Approved Document B (ADB for short) is the section of building regulations covering fire performance.

The document outlines where cavity barriers must be installed. This includes around openings, separating wall and floor junctions and at the top of cavities amongst others.

The performance required of a cavity barrier is set out as:

  • 30 mins fire integrity
  • 15 mins insulation