# Ontario Attic Insulation 2026: R-60 Target, Greener Homes Rebates and Air Sealing

**URL:** <https://home.renovation.reviews/t/ontario-attic-insulation-2026-r-60-target-greener-homes-rebates-and-air-sealing/46908>\
**Category:** Ontario\
**Created:** [April 26, 2026, 7:06pm UTC](https://home.renovation.reviews/t/ontario-attic-insulation-2026-r-60-target-greener-homes-rebates-and-air-sealing/46908 "2026-04-26T19:06:06Z")\
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**Author:** ![system](https://home.renovation.reviews/user_avatar/home.renovation.reviews/system/32/77_2.png) [@system](https://home.renovation.reviews/u/system)\
**Post date:** [April 26, 2026, 7:06pm UTC](https://home.renovation.reviews/t/ontario-attic-insulation-2026-r-60-target-greener-homes-rebates-and-air-sealing/46908/1 "2026-04-26T19:06:06Z")

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Most Ontario homes built before 2000 have R-20 to R-30 attic insulation. The NRCan recommendation – and the Canada Greener Homes Grant threshold – is R-60. Upgrading from R-12 to R-60 can save $400-$900/year in a typical GTA home.

**Insulation types and R-values:**

- Blown cellulose: R-3.5/inch – eco-friendly, good top-up material
- Blown fiberglass: R-2.5/inch – fast install
- Spray foam (closed cell): R-6/inch – best performance, air barrier included
- Batts: R-3 to R-4/inch – DIY-friendly but poor coverage around obstructions

**Critical step contractors skip: air sealing.** All penetrations (pot lights, plumbing stacks, partition walls, attic hatches) must be sealed before adding insulation. An unsealed pot light can defeat R-20 of insulation around it.

**Greener Homes Grant:** Up to $5,600 for insulation upgrades. Requires pre- and post-retrofit EnerGuide evaluation. Budget 4-8 weeks for energy advisor bookings in the GTA.

_Contractor recommendations and rebate questions at [home.renovation.reviews](https://home.renovation.reviews)_