Key Takeaways:
- Shared deck spaces in multi-family buildings require fire-rated materials (Class A or B)
- Aluminum decking is the preferred choice for rooftop amenity decks — fireproof and waterproof
- Condo balcony overlays using deck tiles cost $5–$15 per sq ft — no structural modification needed
- Strata/condo board approval required before any deck modification in most buildings
- Sound transmission between floors requires acoustic underlayment for upper-level decks
Multi-Family Deck Types
Rooftop Amenity Decks
The fastest-growing segment in Canadian multi-family construction. New condos in Toronto, Vancouver, and Montreal increasingly include shared rooftop terraces as building amenities.
Requirements:
- Waterproof membrane protection — pedestal systems raise deck boards above the roof membrane
- Fire rating: Class A minimum for most building codes — aluminum is ideal
- Wind load: rooftop wind speeds can be 2–3x ground level — mechanical fastening required
- Weight: structural engineer must verify roof load capacity — aluminum is lightest
- Railings: must meet guard height requirements for elevation — 42" minimum, glass preferred for views
Townhouse Backyard Decks
Individual townhouse units in complexes may have private backyard decks. These follow residential building code but may have additional strata restrictions:
- Material and colour must match building design guidelines
- Maximum deck height may be limited to preserve sightlines
- Railing style may be mandated for visual consistency
Condo Balcony Upgrades
Individual condo owners can transform concrete balconies with interlocking deck tiles:
- No structural modification — tiles sit on top of existing concrete
- Removable — can be taken when you move
- Composite tiles: $8–$15/sq ft — durable, weather-resistant
- Wood tiles (teak, acacia): $5–$10/sq ft — natural aesthetic
- Typical 75 sq ft balcony: $375–$1,125 total
Fire Safety Requirements
Multi-family buildings fall under NBC Part 3 (buildings of more than 3 storeys or 600m² floor area), which imposes stricter fire requirements:
