In Canada, deck safety is governed by regional building codes often aligned with the International Residential Code (IRC). According to IRC standards, residential decks should support a minimum live load of 40–50 pounds per square foot (PSF), plus dead load. This calculator estimates the total live load capacity of your deck based on span, joist size, spacing, and decking material, adjusted for Canadian construction norms.
Whether you're planning to install a hot tub, host guests, or store heavy equipment, understanding your deck's safe load capacity is critical. Overloaded decks are a leading cause of structural failure and injury. Our calculator uses best-practice assumptions and IRC-based metrics to help Canadians get an estimate of what their deck can safely handle.
Always confirm these calculations with a local inspector or structural engineer, especially in provinces like Ontario, BC, and Alberta where building bylaws may vary. Use this tool as a planning guide for deck upgrades or new builds to stay compliant and safe.