Is Blown-In Insulation Right for Your Ottawa Home?

Keeping your utility bills under control while maintaining a comfortable home can be challenging, especially in Ottawa’s climate. If your home feels drafty, uneven in temperature, or expensive to heat, blown-in insulation may be the solution. But how do you know if it’s the right choice for your home?

Blown-in insulation is particularly effective for older Ottawa homes, especially those with outdated, insufficient, or missing insulation. In this post, we’ll take a closer look at how it works, its advantages, potential drawbacks, and whether it’s a good fit for your property.

What Is Blown-In Insulation?

Blown-in insulation, also known as loose-fill insulation, consists of small particles similar in appearance to confetti that are blown into wall cavities, attic spaces, or ceiling joists using specialized equipment. This method allows insulation to be added without major demolition, making it an efficient upgrade for existing homes.

In many Ottawa neighbourhoods with older construction, blown-in insulation is one of the most effective ways to improve comfort and energy efficiency without extensive renovations.

How Blown-In Insulation Works

One of the biggest advantages of blown-in insulation is its ability to fill existing wall studs and ceiling joists without removing drywall or tearing open walls. The material flows into gaps, cracks, and hard-to-reach areas where cold air often enters. Think of it like filling cavities in your walls to seal air leaks.

Advantages

Benefits of blown-in insulation include:

• Improved heat retention during Ottawa’s cold winters
• Reduced drafts and cold spots
• Better sound absorption, especially in older homes

By creating a consistent insulation layer, blown-in insulation helps maintain even indoor temperatures and reduces the strain on your heating system.

Drawbacks to Consider

While blown-in insulation is highly effective, there are some important considerations.

For existing walls, small holes are drilled near the top of each wall cavity from the exterior. You’ll notice these small openings, but don’t worry: insulation is blown in through them, and the holes are then sealed with plugs designed to match your siding.

Things to keep in mind:

• On siding, plugs typically blend in well; on brick or stucco, they may be more noticeable
• Obstructions inside walls (electrical boxes, plumbing, framing) can limit how evenly insulation fills the cavity
• Over time, some materials may settle, leaving small, uninsulated areas near the top of walls

In Ottawa’s climate, where heat loss can significantly impact energy bills, proper installation is essential to minimize these issues.

Types of Blown-In Insulation

There are several types of blown-in insulation, each with its own strengths and best-use scenarios.

Fiberglass

Loose-fill fiberglass insulation offers an R-value of approximately R-2.5 per inch.

Pros:

• Cost-effective
• Resistant to moisture
• Commonly used in attics

Cons:

• Lower R-value compared to some alternatives

Cellulose

Cellulose insulation is made from recycled paper treated for fire and mold resistance.

Pros:

• Eco-friendly
• Excellent for filling irregular spaces
• Effective at reducing air movement

Cons:

• Can absorb moisture if exposed
• May settle over time

Cellulose is a popular choice in older Ottawa homes where environmental impact and coverage are priorities.

Rock Wool (Mineral Wool)

Rock wool is made from blast furnace slag and offers an R-value of about R-3.3 per inch.

Pros:

• High fire resistance
• Good soundproofing
• Durable and long-lasting

Cons:

• Higher cost than fiberglass or cellulose

Rock wool is often used in areas where fire resistance or building codes are a concern.