Spray foam insulation for attics in London, Ontario costs between $2.50 to $4.50 per square foot installed, with closed-cell foam providing R-6 to R-7 per inch and open-cell delivering R-3.5 to R-3.7 per inch. A typical 1,200 square foot attic requires $3,000 to $5,400 for professional installation, delivering 30-50% energy savings and meeting Ontario Building Code requirements for thermal bridging and air sealing.
How Much Does Attic Spray Foam Insulation Cost in London Ontario?
Attic spray foam insulation costs in London, Ontario depend on foam type, coverage area, and application complexity. Open-cell spray foam ranges from $2.50 to $3.25 per square foot, while closed-cell foam costs $3.50 to $4.50 per square foot installed. A standard 1,200 square foot attic typically requires 4-6 inches of spray foam, totaling $3,000 to $5,400 for complete coverage.
Additional cost factors include attic preparation ($200-$500), existing insulation removal ($1.50-$2.00 per square foot), and air sealing around penetrations. Spray foam insulation costs across Ontario remain consistent, though rural areas may see 10-15% higher pricing due to travel requirements.
London homeowners can access Enbridge rebates up to $5,000 for insulation upgrades, significantly reducing net installation costs. Professional contractors like Spray Foam Kings provide detailed quotes including material, labor, and applicable rebate calculations.
What Are the Energy Savings Benefits of Attic Spray Foam Insulation?
Attic spray foam insulation delivers 30-50% reduction in heating and cooling costs for London homeowners, translating to $800-$1,500 annual savings on typical hydro bills. Closed-cell foam creates a complete thermal barrier with R-20 to R-42 values at 3-6 inch thickness, while eliminating air leakage that accounts for 25-40% of energy loss in conventional attics.
London’s climate zone 6A requires minimum R-50 attic insulation under Ontario Building Code. Spray foam exceeds these requirements while providing superior air sealing compared to fiberglass or cellulose alternatives. Energy savings from spray foam insulation compound over time, with payback periods of 5-8 years typical for Ontario installations.
Additional benefits include consistent indoor temperatures, reduced HVAC system cycling, and elimination of ice dams common in London’s winter freeze-thaw cycles. Professional installation ensures optimal performance and warranty protection for long-term energy savings.
Is Spray Foam Insulation Worth It for London Ontario Attics?
Spray foam insulation provides exceptional value for London attics through superior R-values, air sealing properties, and 25+ year lifespan. Unlike traditional insulation that settles and develops gaps, spray foam maintains consistent thermal performance while preventing moisture issues common in Ontario’s humid climate.
Cost-benefit analysis shows spray foam generating 200-300% return on investment over its lifespan through energy savings, increased home value, and reduced maintenance costs. Spray foam durability exceeds conventional insulation by decades, eliminating replacement costs associated with fiberglass or cellulose options.
London’s temperature extremes (-20°C to +30°C) make thermal bridging control critical for comfort and efficiency. Spray foam eliminates thermal bridges while providing moisture vapor control, preventing condensation issues that damage roof structures and reduce indoor air quality.
What Types of Spray Foam Work Best for Ontario Attics?
Closed-cell spray foam performs optimally in Ontario attics, providing R-6 to R-7 per inch with superior moisture resistance and structural strength. This high-density foam (2 pounds per cubic foot) creates an impermeable barrier preventing warm, humid air from reaching cold roof surfaces where condensation occurs.
Open-cell spray foam offers cost-effective insulation at R-3.5 to R-3.7 per inch, requiring greater thickness to achieve target R-values but providing excellent air sealing at lower cost. Open-cell versus closed-cell comparisons show application-specific advantages for different attic configurations.
Professional contractors assess attic conditions, ventilation requirements, and building code compliance to recommend optimal foam types. Factors include roof slope, ventilation strategy, and existing moisture issues that influence foam selection and application methods.
Can You Apply Spray Foam Over Existing Attic Insulation?
Spray foam can be applied over existing fiberglass or cellulose insulation in most London attics, provided the existing material is dry, mold-free, and properly assessed by qualified contractors. This approach reduces removal costs while improving overall thermal performance through enhanced air sealing.
Existing insulation must be evaluated for moisture damage, pest contamination, or settlement issues before spray foam application. Applying spray foam over existing insulation requires careful preparation and may involve partial removal in problem areas.
Combined systems using existing insulation plus spray foam can achieve superior R-values cost-effectively, with spray foam providing critical air sealing while existing insulation contributes bulk thermal resistance. Professional assessment ensures optimal performance and prevents moisture-related issues.
Frequently Asked Questions
How long does attic spray foam insulation installation take in London?
Typical attic spray foam installation requires 4-8 hours for 1,200 square foot coverage, depending on attic configuration and preparation requirements. Complex installations with multiple penetrations or irregular spaces may require additional time for proper coverage and curing.
What rebates are available for attic spray foam insulation in Ontario?
Ontario homeowners can access Enbridge rebates up to $5,000 for insulation upgrades meeting program requirements. Spray foam insulation qualifies for Ontario Enbridge rebates when installed by certified contractors and meeting minimum R-value requirements.
Does spray foam insulation require attic ventilation changes?
Closed-cell spray foam applied to roof decking eliminates need for attic ventilation, creating a conditioned attic space. Open-cell applications may require vapor barriers and maintained ventilation depending on building code requirements and contractor recommendations.
What safety considerations apply to attic spray foam installation?
Professional spray foam installation requires proper ventilation, respiratory protection, and evacuation during application and initial curing. Certified contractors use appropriate safety equipment and follow manufacturer protocols to ensure safe installation and indoor air quality.
Contact Spray Foam Kings for a free quote — serving London and all of Ontario.