Quebec · Energy · checked September 28, 2026

Attic insulation inspections in Longueuil

The attic is usually the cheapest big energy fix in a house, and the inspection decides how to do it: how much insulation is there, where air leaks through the ceiling, and whether anything up there must not be disturbed.

Get matched in Longueuil → What an attic inspection checks
Loose-fill insulation between attic joists, a yellow ruler showing its depth and frost on the roofing nails above

Cost

Included in an evaluation

Houses built before 1991

76%

Heating degree-days

4,275

Common finding

R-10–20 vs R-50–60 target

How Longueuil is built

Longueuil's houses by when they were built Ten house shapes, one for each tenth of Longueuil's 52,710 houses. Before 1961: 21%, 1961–1990: 55%, 1991–2000: 9%, 2001 or later: 16%. Older houses glow hotter.
  • Before 1961 21%
  • 1961–1990 55%
  • 1991–2000 9%
  • 2001 or later 16%
Each house stands for one in ten of Longueuil's 52,710 houses (single-detached, semi-detached, row and duplex), drawn by when it was built. The glow shows the usual pattern: older houses tend to be leakier and less insulated. Snowfall scales with heating degree-days. Sources: Statistics Canada 2021 Census (table 98-10-0233-01), NRCan HOT2000 climate data.

What inspections find in Longueuil attics

Of Longueuil's 52,710 houses (single-detached, semi-detached, row houses and duplexes), 21% were built before 1961 and 76% before 1991, according to the 2021 Census. Attics in older houses commonly have a fraction of today's recommended insulation, and top-ups done over the years often buried air leaks instead of sealing them first.

Longueuil gets about 4,275 heating degree-days a year and has a winter design temperature of −23.2°C, according to NRCan's HOT2000 climate data for Montréal-St-Hubert. That's about 9% more heating demand than the middle of the 70 cities we cover. The colder the climate, the faster added attic insulation pays for itself.

Vermiculite. Loose, pebbly, grey-brown or silver-gold insulation may contain asbestos. Health Canada's advice is not to disturb it; have it sampled before any attic work. Asbestos and vermiculite testing in Longueuil

The right order for the work

  • Seal the air leaks first: top plates, pot lights, plumbing stacks, the hatch.
  • Fix ventilation baffles so new insulation doesn't block soffit vents.
  • Then top up the insulation. Burying unsealed leaks under new insulation wastes much of the benefit.

What an attic inspection checks.

NRCan-licensed service organizations serving Longueuil

In Quebec, EnerGuide evaluations for existing homes run through the provincial Rénoclimat program; the organizations below are the ones NRCan lists for Longueuil postal codes.

Every EnerGuide evaluation includes an attic inspection: insulation depth, air leaks and red flags such as vermiculite or knob-and-tube wiring.

Source: NRCan list of licensed service organizations, checked September 28, 2026. Call to confirm your street is covered and ask about wait times.

Insulation programs in Longueuil

Provincial · needs an evaluation Rénoclimat (Quebec) Quebec's audit-linked path: an assigned evaluator for $150 + tax (refunded except the tax when you receive assistance), then rebates for insulation, air sealing, doors and windows Open Provincial Hydro-Québec LogisVert Heat pump grants scaled to capacity — $50–$120 per 1,000 BTU/h — plus appliances and solar, no audit needed Open Federal CMHC Eco Improvement premium refund 25% back on your CMHC mortgage insurance premium after $20,000 of energy renovations Open Federal Canada Greener Homes Affordability Program Free retrofits for low-to-median-income households in BC, Manitoba, Nova Scotia, PEI and Quebec — not available in Ontario Open · deadline

Attic insulation inspection in Longueuil: common questions

How much attic insulation should a Longueuil house have?

Advisors commonly target around R-50 to R-60 in attics. Your EnerGuide report gives the recommendation for your house.

Can I top up the insulation myself?

Only after the air leaks are sealed and you've confirmed there is no vermiculite. The inspection tells you both.

Will more insulation stop ice dams?

Insulation helps, but ice dams are mostly caused by warm air leaking into the attic. Air sealing is the bigger fix.

Attic insulation inspection near Longueuil

Attic insulation inspection in Montréal14 kmAttic insulation inspection in Laval23 kmAttic insulation inspection in Saint-Jean-sur-Richelieu26 kmAttic insulation inspection in Terrebonne28 kmAttic insulation inspection in Trois-Rivières115 km All 70 cities →

Sources

Checked September 28, 2026. Census figures are for the municipality (Quebec); climate data is NRCan's HOT2000 station Montréal-St-Hubert (3 km away).

Get matched with a registered advisor in Longueuil

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