Fire & Sound Rating Calculator — Part 9 Residential

1 · Building Type

Part 9 small-scale residential, ≤ 3 storeys

2 · Construction Type

New vs. alteration of existing building

New construction

All Division B acceptable solutions apply. Full FRR & STC requirements.

Alteration of existing building to add a secondary suite

Division A Table 1.1.1.1.(6) Alternate Compliance Methods may substitute for certain Division B requirements.

Div. A, 1.1.1.1.(6)

3 · Smoke Alarm Configuration

Drives the required FRR per 9.10.9.16.(4) & 9.10.9.17.(4)

Building is sprinklered

No fire-resistance rating is required for the separation.

9.10.9.16.(4)(d)

All smoke alarms photo-electric + interconnected

Per Clause 9.10.19.5.(2)(a) — actuation of one alarm sounds all alarms throughout the house.

→ 15 min FRR permitted · 9.10.9.16.(4)(a)

Additional photo-electric alarms interconnected

Per Clause 9.10.19.5.(2)(b) — one extra photo-electric alarm in each DU and common space, interconnected.

→ 30 min FRR permitted · 9.10.9.16.(4)(b)

No interconnected alarms as above

Alarms not configured per 9.10.19.5.(2)(a) or (b).

→ 45 min FRR required · 9.10.9.16.(4)(c)

3 · Sprinkler Status

Drives floor / supporting-wall FRR per Table 9.10.8.1. & 9.10.8.2.

Not sprinklered

Floors and the loadbearing walls/columns supporting them must meet the Table 9.10.8.1 minimum.

→ 45 min FRR required · Table 9.10.8.1.

Sprinklered (full NFPA 13D / 13R system)

Floor/roof FRRs may be waived or reduced per 9.10.8.2. and 9.10.8.1.A. (sprinkler must be electrically supervised per 3.2.4.9.(3) and signal the fire dept per 3.2.4.7.(4)).

→ FRR waived · 9.10.8.2.

Building · Full Requirements

Live values for every related code requirement — the row marked GOVERNS is what you actually build to

Element	Required	Code

4 · Compliant Standard Assemblies

Filtered from BCBC 2024 Table 9.10.3.1.-A & -B

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	Drawing	ID	Description	FRR	STC	IIC

5 · Print Bundle — 0 selected

Tick assemblies in section 4 to add them. Click Print to PDF to export them all in one document.