How High Can You Store Goods Below Fire Sprinklers in Ontario?

Adding a higher shelf can look like a simple way to gain space. In a sprinklered stockroom or warehouse, it also changes the relationship between stored goods and fire protection. Before raising storage, confirm the clearance and storage limits that apply to that particular area.

Is 18 inches always enough?

No. Ontario’s indoor general storage provisions include a minimum clearance of 457 mm (approximately 18 inches) between the sprinkler deflector and the top of storage. That is not a universal approval for every commodity, sprinkler or storage arrangement.

Division B, Subsection 3.2.2 of the Ontario Fire Code covers indoor general storage of combustible solids and noncombustible solids with combustible packaging or storage aids, including shelves and racks. Special-hazard commodities and certain bulk storage have separate rules. Article 3.2.2.3 contains the 457 mm requirement.

Different storage can have different requirements. For example, the separate indoor tire-storage provisions specify 914 mm clearance and have their own application threshold. Confirm the applicable provisions and system design rather than copying a clearance from another building.

What should the measurement include?

Measure from the top of the stored goods to the sprinkler’s deflector, not simply to the ceiling or pipe. Include cartons, packaging and anything temporarily placed above the normal stock level. If the correct reference point cannot be identified safely, ask your service provider to check it.

A useful question is: “What is the permitted maximum storage height here, and what information supports that limit?” Ask for the answer to identify the area, sprinkler arrangement and type of goods. A tape-measure check alone does not establish that the system can protect a new storage use.

Check more than the gap above the boxes

Article 6.5.1.5 prohibits obstructions that interfere with effective sprinkler discharge. Tall shelving, new partitions or overhead objects therefore need attention even if the nearest stack appears low enough. Do not hang signs or other items from sprinkler equipment.

For a proposed layout change, record:

• The room or rack location and proposed maximum storage height.
• What will be stored, including packaging and any new plastics, aerosols or liquids.
• Shelf construction, rack layout and changes to aisles.
• Ceiling height, nearby obstructions and any sprinklers within racks.
• Available sprinkler drawings, design information and recent inspection findings.

Turn the answer into a usable storage rule

Ask a qualified fire-protection professional whether the existing design supports the proposed arrangement and whether specialist design review or approvals are needed. Keep that review separate from routine equipment inspection: a recent inspection report should not be assumed to approve a later layout change.

Once the limits are established, consider clearly marking the agreed maximum storage height and briefing everyone who stocks the area. Include temporary deliveries and seasonal overflow in that discussion. These are practical management steps, not substitutes for the applicable code or design requirements.

What should you send with a quote enquiry?

Send the address, photos taken safely from floor level, the current and proposed layout, storage details and available drawings. Explain whether you need a routine inspection, an obstruction assessment or review of a planned change. FC Fire’s inspection and testing services page explains how to prepare the equipment scope and records.

Contact FC Fire Prevention to discuss the appropriate scope before changing your storage arrangement.

Sources checked October 16, 2026: Ontario Fire Code, Division B, Articles 3.2.2.1, 3.2.2.3, 3.2.1.1, 3.2.1.4 and 6.5.1.5; Ontario’s 2026 Fire Code Compendium. General planning guidance; site-specific requirements must be confirmed.