Fire & Sound Rating Calculator

1 · Separation Scenario

What is being separated from what?

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)

4 · Assembly Properties

Filter compliant assemblies by what you are building

Assembly type

Loadbearing

Required Ratings

Fire Resistance

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Sound Transmission

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5 · Compliant Standard Assemblies

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

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Drawing	ID	Description	FRR	STC	IIC

6 · Related Requirements

Structural, openings, alarms, services