Compartmentation is the backbone of passive fire protection. But how do you know if yours is intact? We explain compartmentation surveys and why they're critical.. What Is Compartmentation? Compartmentation divides a building into fire resistant sections that contain fire and smoke for a specified period — typically 30 or 60 minutes. Key elements: Fire rated walls and floors Fire doors with intumescent strips and cold smoke seals Fire stopping at service penetrations Cavity barriers in concealed spaces Why Surveys Are Needed Construction Defects Incomplete fire stopping at service penetrations Gaps in fire rated walls (often around ductwork, pipework) Missing cavity barriers in ceiling voids Post Occupation Damage Tenant alterations breaching fire walls Service installations without fire stopping Fire door damage and removed closers Regulatory Requirements Fire Safety Act 2021 extends assessment to structure and external walls BSR requires evidence of compartmentation integrity for HRBs Insurance underwriters increasingly require surveys The Survey Process 1. Desk study — review original drawings and specifications 2. Visual inspection — all accessible compartment boundaries 3. Invasive inspection — sample opening up of concealed areas 4. Report — detailed findings with prioritised recommendations 5. Remediation specification — if defects are found Commission a compartmentation survey. Contact Magnus Opifex.