
It is not difficult to reduce energy use in your home if you follow a few simple procedures. Spray foam insulation and batt insulation may both keep a home warm while also lowering the homeowner's monthly energy costs.
Before deciding which of these two types of insulation to utilise, several factors must be taken into account. Read on to help you decide which form of insulation is best for your needs.
In the manufacture of batt insulation, glass fibres are employed. This insulation is installed in the building's walls and ceilings. It is available in both rolled and loose-fill varieties. Existing walls and attics are typically insulated with loose-fill insulation rather than rolled insulation.
Insulation in the shape of batts or fibreglass is easily available at home improvement stores. Fibreglass insulation is widely available and relatively affordable to acquire.
Spray foam insulation is applied to the walls with a spray cannon to insulate them. When liquid glue is mixed with insulation, the resulting combination swells and hardens, sealing the building's structure.
It is used to fill cavities, holes, and gaps in walls and ceilings in order to boost energy efficiency. Spray foams can withstand high temperatures and have excellent heat resistance.
Spray foams can be employed in settings with high temperatures, high humidity, and low temperatures. It is also moisture resistant, making it an excellent choice for houses that are frequently wet or damp.
Homeowners debate the benefits of spray foam insulation vs fibreglass insulation. Despite their different applications, spray foam insulation and fibreglass insulation both offer their own set of advantages. Here is how we compare the two:
R-value is an extremely significant component to consider when comparing spray foam vs batt insulation. The R-value of a substance can be used to determine its heat resistance.
Insulation with a higher R-value prevents heat transfer better than insulation with a lower value. Spray foam insulation has an R-6 rating, whereas fibreglass insulation has an R-3.8 to R-5 rating.
When it comes to preventing heat transmission, spray foam insulation outperforms that offered by fibreglass. As a result, spray foam insulation is beneficial in terms of energy efficiency.
Batt insulation serves as a good moisture barrier in the attic. Because it is applied rather than expanded, it is a less effective form of sealing than spray foam.
Meanwhile, spray foam insulation is commonly utilised in places with high humidity levels, such as the interiors of boats and seaside cottages. It functions particularly well as an insulator in moist situations.
Spray foam insulation and batt insulation are both effective techniques of insulation. As the thickness of the batt insulation influences its longevity, spray foam is a more durable substance than fibreglass because of its higher density.
Another feature that is compared and contrasted is the ease of installation. Spray foam insulation installation is significantly easier than batt insulation installation.
Batt insulation can be installed either by hand or by machine, while spray foam insulation installation is significantly less complicated than batt insulation installation.
Batt insulation is less expensive than spray foam. The cost of spray foam insulation can be equivalent to that of batt insulation, depending on its thickness. As such, when calculating the cost of insulating a structure, keep in mind the cost of tools and other materials.
When it comes to home insulation, fibreglass insulation is a more secure alternative than spray foam insulation. The isocyanate component of spray foam is hazardous to one's health.
Spray foam and batt insulation both enhance energy efficiency and reduce sound transmission. At the same time, both insulation batts and spray foam help to improve the energy efficiency and quietness of residential structures.
Following this discussion, we find that spray foam insulation is superior to batt insulation because it is more effective in bad weather conditions and retains more heat. Spray foam insulation costs more than batt insulation; however, spray foam insulation lasts longer and needs less labour to install.
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Neither is universally better, as the right choice depends on your specific application, budget, and performance goals. Spray foam offers superior air sealing and higher R-values per inch, making it ideal for hard-to-reach areas and new construction, while batt insulation is a cost-effective, DIY-friendly option for standard stud and joist cavities. Most GTA homes benefit from a combination of both products used strategically throughout the building envelope.
A significant concern in Canada is that certain spray polyurethane foam (SPF) products, particularly those using HFO-based blowing agents, have been linked to off-gassing issues and, in some cases, failure to fully cure, leaving homes with persistent chemical odours and potential health risks. Additionally, spray foam can trap moisture against roof sheathing or wall framing, leading to hidden rot and structural damage that only becomes apparent years later. Some homeowners are also removing it because it makes future renovations and inspections of wiring, plumbing, and structural components extremely difficult and costly.
Closed-cell spray foam typically delivers an R-value of approximately R-6 to R-7 per inch, while open-cell spray foam provides around R-3.5 to R-4 per inch. Standard fibreglass batt insulation offers roughly R-3 to R-4 per inch, and mineral wool (rock wool) batts perform at about R-3.7 to R-4.2 per inch. In practical terms, closed-cell spray foam achieves the highest thermal resistance in the thinnest profile, which is a key advantage in space-constrained applications.
Spray foam should not be applied directly over recessed light fixtures that are not rated for insulation contact (IC-rated), as it creates a fire hazard. It is generally not recommended on the interior side of roof sheathing in existing homes without proper vapour and moisture analysis, as it can cause sheathing rot by changing the drying potential of the assembly. You should also avoid using it in areas requiring frequent access for maintenance or inspection, such as around electrical panels, exposed plumbing shut-offs, or removable access panels.
Batt insulation does not air seal on its own, meaning gaps, compression, or improper installation around electrical boxes, pipes, and framing can significantly reduce its real-world thermal performance. It is susceptible to moisture absorption, particularly fibreglass batts, which can lose R-value when wet and may promote mould growth if a vapour barrier is not properly installed. Achieving full coverage in irregularly shaped cavities, around obstructions, or in attic areas can be challenging and often results in voids that allow heat loss and cold air infiltration — a common issue in older GTA homes.
R-values per inch sourced from manufacturer technical data and Natural Resources Canada. Cost comparisons based on Konstruction Group’s installed pricing across 500+ insulation projects in the GTA from 2024–2026.

Written & reviewed by
Fadi MamarCo-founder, Konstruction Group Inc
Engineering graduate from Toronto Metropolitan University with 14+ years in Toronto construction. Has overseen 500+ residential and commercial framing, insulation, and drywall projects across the GTA.
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