Question 1

How much does insulation cost in the GTA?

Accepted Answer

Closed-cell spray foam typically runs $2.50–$4.50 per board foot installed, open-cell $1.50–$2.50 per board foot, and blown-in attic top-ups $1.80–$3.20 per sq ft. A typical 1,500 sq ft basement spray foam project in the GTA lands between $5,500 and $9,500. Every Northstar quote is free, written, and all-in — no surprise charges.

Question 2

What R-value do I need in Ontario?

Accepted Answer

Ontario Building Code climate zone 5 calls for R-60 in attics, R-22 effective in above-grade walls, and R-20 continuous (or R-12ci + R-13 batt) in basements. Closed-cell spray foam delivers ~R-6 to R-7 per inch, open-cell ~R-3.7, blown-in cellulose ~R-3.7, and fiberglass batts R-3.1 to R-3.8 per inch.

Question 3

How long does the installation take in the GTA?

Accepted Answer

Most residential spray foam jobs are completed in a single day. A basement or rim joist project typically takes 4–8 hours; a full attic conversion 1–2 days; a blown-in attic top-up 3–5 hours; an insulation removal adds about half a day. We protect the site, mask floors and windows, and clean up before we leave.

Question 4

What insulation rebates are available in Ontario?

Accepted Answer

Ontario homeowners can access the Canada Greener Homes Loan (interest-free up to $40,000), Enbridge Home Efficiency Rebate Plus (up to $10,000 for attic, basement and wall insulation upgrades), and the Oil to Heat Pump Affordability program when paired with insulation. All rebates require a pre- and post-retrofit EnerGuide evaluation — we help coordinate the energy advisor and paperwork.

Question 5

Open-cell vs closed-cell spray foam — what's the difference?

Accepted Answer

Closed-cell foam is rigid, water-resistant, vapour-impermeable, and delivers R-6 to R-7 per inch — ideal for basements, rim joists, crawl spaces, and exterior assemblies. Open-cell foam is softer, vapour-permeable, and delivers R-3.6 to R-3.9 per inch — best for interior walls and attics where sound dampening matters and a vapour retarder is installed separately. We help you choose the right product for each cavity.

Question 6

What warranty do you provide on insulation work?

Accepted Answer

All Northstar workmanship is backed by a 2-year written guarantee. Spray foam carries the manufacturer's lifetime material warranty (BASF v.5 and Elastochem Insulthane Extreme) and is registered through CUFCA's Quality Assurance Program — which requires the installer to be CUFCA-certified, like Northstar.

Question 7

How long does spray foam and other insulation last?

Accepted Answer

Properly installed closed-cell and open-cell spray foam last the lifetime of the building — 80+ years — without sagging, settling, or losing R-value. Blown-in cellulose lasts 20–30 years before a top-up may be needed. Fiberglass batts last 15–25 years if they stay dry and uncompressed. Northstar's installs are documented with daily CUFCA reports so your warranty stays valid.

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