Is natural hydraulic lime stucco available from suppliers in Ottawa?

Natural hydraulic lime (NHL) stucco is available from specialized masonry suppliers in Ottawa, though it requires more effort to source than standard Portland cement stucco. This traditional material is experiencing renewed interest, particularly for heritage restoration projects in Ottawa's historic neighborhoods like Sandy Hill, the Glebe, and Centretown.

Sourcing NHL Stucco in Ottawa

Several masonry supply companies in the Ottawa area can order natural hydraulic lime, including Permacon, Brampton Brick, and specialized heritage restoration suppliers. St. Astier Natural Hydraulic Lime is one of the most commonly available brands in Eastern Ontario. You'll typically need to special order NHL products with 1-2 weeks lead time, as most suppliers don't stock it regularly. The material costs approximately $25 to $40 per 55-pound bag, significantly more expensive than Portland cement stucco at $8 to $12 per bag.

NHL stucco offers unique advantages in Ottawa's climate. It's naturally breathable, allowing moisture vapor to pass through rather than trapping it behind the finish. The material has self-healing properties for hairline cracks and remains more flexible than Portland cement, which helps it survive freeze-thaw cycles. Lime stucco is also naturally antimicrobial and develops a beautiful patina over time.

However, NHL stucco presents significant challenges in Ottawa's short building season. Lime stucco requires 28 days of curing time compared to 7 days for Portland cement, and it needs protection from rapid drying, freezing, and rain during this extended cure period. This effectively limits application to June through early September when weather conditions remain stable. The material also requires specialized mixing techniques and application methods that many contractors aren't familiar with.

Expect to pay $15 to $25 per square foot for NHL stucco installation in Ottawa, compared to $8 to $14 for traditional stucco. The higher cost reflects both material expense and the specialized labor required. Most applications are on heritage properties where authenticity and breathability are priorities over cost efficiency.

If you're considering NHL stucco for a heritage restoration project, consult with contractors experienced in traditional lime work and verify any heritage district requirements through the City of Ottawa's planning department. You can find contractors familiar with specialty stucco materials through the Ottawa Construction Network directory at justynrookcontracting.com using the stucco trade filter.