What is Spray Foam Insulation?
Spray foam insulation is a polyurethane-based material that is applied as a liquid and expands into a solid foam. It forms a seamless, airtight barrier that fills cracks and gaps in walls, floors, and ceilings. Unlike traditional insulation such as fiberglass or cellulose, spray foam provides a continuous layer that helps control air movement and maintain consistent comfort in Ottawa’s hot summers and cold winters. For homeowners who are new to spray foam, understanding the different types is an important step in determining which option is best suited for your home.Open-Cell vs Closed-Cell: Which Spray Foam Is Right for You?
Not all spray foam insulation is the same. There are two primary types, each with different characteristics, performance levels, and price points. Understanding the differences between open-cell and closed-cell spray foam will help you choose the option that best suits your home and budget.Open-Cell Spray Foam
Open-cell spray foam has a softer, less dense structure and is generally the more affordable option. It is best suited for interior walls and attic spaces where moisture control is not a primary concern. Open-cell foam provides a moderate R-value of approximately R-3.5 to R-3.8 per inch and allows some moisture vapor transmission, which can be beneficial in certain applications.
Closed-Cell Spray Foam
Closed-cell spray foam is denser and more rigid, offering a higher R-value per inch, typically R-6 to R-6.5. It provides excellent moisture resistance and structural rigidity, making it ideal for basements, crawlspaces, attics, and exterior walls that are exposed to outdoor moisture. Closed-cell foam also delivers superior air sealing and a strong moisture barrier, making it a premium option for homes where energy efficiency and long-term protection are priorities. Choosing the right type of spray foam comes down to the location of the installation, the level of moisture control needed, and your budget. In many cases, a professional assessment can help determine which option will provide the best combination of performance and value for your home.Factors Affecting Spray Foam Installation Cost in Ottawa
Knowing what drives spray foam insulation costs can help you plan your budget and make smart decisions for your home. Several key factors influence the overall cost, including the size of the space, type of foam, R-value requirements, accessibility, and prep work. Here’s a closer look at each one.Size of Space
The total square footage is the biggest driver of cost. The larger the area you need to insulate, the more material and labour you’ll need. For example, a small attic project of 500 square feet will cost significantly less than a full-home application. Most insulation contractors will conduct a site visit to measure the space before providing an estimate.Type of Spray Foam
As we mentioned earlier, the type of foam used also affects the overall cost. Open-cell is generally the more affordable option, while closed-cell comes at a higher price due to its density, insulation performance, and moisture resistance. Many homeowners choose a hybrid approach, using open-cell in interior areas and closed-cell in spaces where moisture control or added rigidity is important.R-Value Requirements
R-value measures how well insulation resists heat flow. In Ottawa, recommended R-values vary depending on the application: attics typically require R-50 to R-60, exterior walls R-20 to R-25, and basements or crawl spaces R-15 to R-30. Higher R-values require thicker foam layers, which increases both material and labour costs. Local building codes, your current insulation levels, and an energy audit can all help determine the optimal R-value for your home.Accessibility and Prep Work
Hard-to-reach areas like crawl spaces, tight attic corners, or narrow wall cavities can take longer to insulate, which adds to labour costs. If your existing insulation is old, wet, or moldy, it should be removed first. While removal adds upfront cost, it ensures the new insulation sticks properly and performs as it should.Other Factors That Can Affect Cost
- Climate and seasonal factors: Spray foam installation is sensitive to temperature and humidity, so some contractors may adjust pricing depending on the time of year.
- Complexity of the project: Oddly shaped spaces, multiple stories, or intricate framing can add to labor costs.
- Local regulations and permits: Some projects may require inspections or compliance with specific building codes, which can affect cost.
Where Spray Foam Insulation Is Best Used
Spray foam insulation performs especially well in areas that benefit from strong air sealing and moisture control. This is particularly useful in a climate like Ottawa’s, where homes experience cold winters, humid summers, and frequent temperature swings.Attics and Crawl Spaces
Attics and crawl spaces often have irregular framing, small gaps, and hard-to-reach corners. Spray foam expands to fill these areas completely, reducing heat loss in winter and helping keep the home cooler in the summer. These spaces typically see some of the biggest efficiency improvements after spray foam is installed.Basements and Below-Grade Spaces
Basements are prone to moisture issues due to humidity, concrete foundation walls, and changes in outdoor temperature. Closed-cell spray foam serves as both insulation and a vapor barrier, helping reduce condensation and limiting the risk of mold.Rim Joists and Band Boards
Rim joists are a common source of drafts, especially in older homes. Spray foam seals these gaps effectively, improving comfort on the main floor and reducing unwanted air movement.Exterior Walls in New Construction
In new builds, spray foam applied to exterior walls creates a continuous insulation layer that provides better air sealing than traditional batt insulation. This helps homes meet modern energy-efficiency standards and reduces long-term heating and cooling costs.Around Pipes and Ducts
Heat loss around ducts and plumbing chases is a common issue. Applying spray foam in these areas improves insulation, reduces energy waste, and helps maintain more consistent temperatures throughout the home.FAQ: Spray Foam Insulation Cost
Spray foam in Ontario generally ranges from $0.44 to $8 per square foot, depending on whether you choose open-cell or closed-cell foam, the required thickness, and the complexity of the project. A contractor will need to see the space before providing an accurate estimate.
Spaces with air leakage, irregular framing, or moisture concerns see the biggest improvement. This includes attics, crawl spaces, basements, rim joists, and exterior walls in new construction.
Spray foam provides superior air sealing, higher long-term energy savings, and better moisture control compared to traditional insulation. While it costs more upfront, many homeowners find the efficiency gains worth the investment.
Yes. Because spray foam reduces both heat loss and air leakage, most homeowners experience noticeable reductions in heating and cooling costs, especially in older homes with gaps or outdated insulation.
Sometimes. If your existing insulation is wet, moldy, degraded, or interfering with access, removal is recommended. Your installer will assess this during the site visit.
Most residential projects take one to three days, depending on the size of the area and the level of prep work required.
Yes. After the foam cures, typically within 24 hours, the material is inert and safe for occupants. Installers use proper ventilation and protective equipment during application.
Closed-cell spray foam provides an effective moisture barrier and helps prevent condensation, which reduces the risk of mold growth. It is especially beneficial in basements and below-grade areas.
Spray foam typically lasts 50 years or more without needing replacement, making it one of the most durable insulation options.
Upgrade Your Ottawa Home with Spray Foam Insulation
Spray foam insulation is a smart investment for homeowners in Ottawa who want to stay comfortable year-round, reduce energy bills, and protect their home against drafts and moisture. With cold winters, humid summers, and frequent temperature swings, choosing the right insulation can make a noticeable difference in comfort and efficiency.
By understanding the different types of spray foam, the factors that influence cost, and where it performs best, you can make an informed decision about what your Ottawa home truly needs.
Ready to see how much you can save? Contact us today for a free estimate and take the first step toward a more comfortable, energy-efficient Ottawa home.
