What are the Alberta Building Code requirements for flooring in secondary suites?

The Alberta Building Code has several requirements that affect flooring in secondary suites, focusing on fire resistance, flame spread, moisture control, and accessibility. If you are building a legal secondary suite in your Calgary home — whether it is a basement suite, above-garage suite, or garden suite — your flooring choices must comply with these code provisions as part of the overall permit and inspection process.

Fire-resistance ratings are the most significant code requirement. The floor and ceiling assembly separating the secondary suite from the main dwelling must achieve a minimum one-hour fire-resistance rating (Section 9.10 of the Alberta Building Code). This applies to the entire assembly — joists, subfloor, insulation, drywall ceiling below, and finish flooring above. While the finish flooring alone does not carry the full fire rating, it contributes to the assembly's overall performance. Carpet with underpad can add to the fire resistance of a floor assembly, and some tile and stone installations provide superior fire performance. Your designer or building inspector will evaluate the complete assembly, not just the flooring material in isolation.

Flame-spread ratings apply to all interior finish materials in a secondary suite. The Alberta Building Code limits flame-spread ratings for wall and ceiling finishes to 150 or less in dwelling units, and floor coverings must not contribute to rapid fire spread. Most standard flooring products — hardwood, laminate, LVP, tile, carpet — meet these requirements when properly manufactured and tested to CAN/ULC-S102 standards. Check that any flooring product you purchase carries the appropriate test certification, particularly for imported or no-name products.

Moisture management is addressed through the code's requirements for vapour barriers and moisture protection in below-grade construction. For basement suites, the code requires a vapour barrier beneath concrete slabs and adequate drainage around the foundation. From a flooring perspective, this means verifying that the slab's moisture vapour emission rate is within acceptable limits before installing any flooring. In Calgary, where frost depth exceeds 1.2 metres and spring snowmelt can elevate groundwater levels, this is especially critical. A calcium chloride test should show less than 3 lbs per 1,000 sqft per 24 hours before flooring goes down.

Egress requirements affect flooring choices near exits. Secondary suites must have a direct exit to the exterior, and the flooring in the exit path must provide safe footing. This means slip-resistant flooring near exterior doors — particularly important in Calgary where occupants track in snow, ice, and water for six months of the year. Textured tile or LVP with adequate slip ratings are good choices for entry areas.

The most practical flooring choices for Calgary secondary suites balance code compliance, durability for rental use, and Calgary's climate challenges. LVP at $4–$9 per square foot installed is the most popular choice — it is waterproof, durable, handles Calgary's humidity swings without gapping, and stands up to tenant turnover. Porcelain tile at $8–$25 per square foot installed is ideal for bathrooms and kitchens, especially with heated flooring for tenant comfort. Engineered hardwood at $7–$14 per square foot installed works well for living areas with a proper moisture barrier over the slab.

All secondary suite work in Calgary requires permits and inspections through the City of Calgary. Your flooring will be reviewed as part of the inspection process by a Safety Codes Officer. Find a flooring installer experienced with Calgary suite developments through the Calgary Construction Network at calgaryconstructionnetwork.com/directory?trade=flooring.