Serving Newmarket, Aurora and East Gwillimbury

Free written estimates · +1 (289) 210-8352

Attic air sealing shuts the small openings where heated house air pours up into the attic, with spray foam, caulk and fitted covers. We do it before any new attic insulation goes down, since insulation slows heat yet lets moving air straight through.

A typical ceiling hides dozens of small openings at pot lights, plumbing stacks, wiring, bath fans, chimneys and the tops of inside walls. Added up they can leak like an open window, and attic air sealing is the cheapest way to shut them.

Attic Air Sealing details

What Attic Air Sealing Prevents

House air drifting upward carries water vapour. On a Newmarket January night that vapour freezes onto the roof sheathing, then thaws and rains down on the fill when a mild day arrives. The same leaking heat warms the upper roof and starts ice building at the eaves.

Attic air sealing cuts both problems off where they begin. It also takes the draft out of the rooms below, because cold outside air is no longer pulled in to replace the warm air that left.

Where We Seal In A Typical Attic

Attic air sealing covers plumbing vents and wires where they pass through the top plates of walls. Pot lights get covers made for the fixture, the bath fan housing is sealed to the drywall, the chimney chase gets metal flashing and fire-rated sealant, and the hatch gets a gasket.

Each opening we close is listed on the quote, so you can see exactly what was done.

Attic Air Sealing Fits Best Before A Top-Up

Sealing is easiest while the attic floor is in view. Once a deep layer of fresh fill is down, the openings are buried and out of reach. That is why every attic insulation top-up and every refill after attic insulation removal begins with attic air sealing.

Attic Air Sealing Price

As a stand-alone job, attic air sealing lands around $400 to $1,500, depending on the count of openings and the crawl involved. Combine it with new fill and the whole visit is about $2.00 to $3.50 for every square foot of attic floor.

Book A Leak Hunt In Your Ceiling

Phone (289) 210-8352, and we will hunt down the leaks in your ceiling and put an attic air sealing price in writing. See how sealing fits our other work on the Newmarket attic insulation home page.

Jobs That Often Share The Same Visit

Sealing, the hatch and a top-up tend to share one install day, which spares you a second visit.

  1. Deep grey blown-in insulation reaching the rafters along the eaves of an attic

    Attic Insulation Top-Up

    An attic insulation top-up keeps your existing fill and blows a fresh layer over it until the attic reads R-60. Our two depth readings record exactly how many inches went on.

  2. Grey blown cellulose spread across an attic floor, with light coming through the soffit vents

    Cellulose Insulation

    Cellulose insulation starts life as newsprint and cardboard, shredded and treated so it resists fire and pests, and we blow it across the attic floor as loose fill. Because it tucks in around wiring, nails and truss webs, cellulose insulation is the material we pick most often for older attics.

  3. Thick white blown-in fiberglass across an attic, lit by a gable window

    Blown-In Fiberglass Attic Insulation

    Blown-in fiberglass insulation arrives as fluffy spun glass that the hose lays down in a soft, even blanket. It will not soak up water, puts very little weight on the ceiling and holds its depth for years.

  4. Vacuum hose nozzle lifting old cellulose insulation out of a joist bay

    Attic Insulation Removal And Replacement

    Attic insulation removal clears out fill that is damp, mouldy, fouled by mice or squirrels, or crushed past saving. With the joists bare and the ceiling sealed, new attic insulation is blown back in to full depth.

  5. Attic hatch opening framed by a raised wooden dam in deep white loose-fill insulation

    Attic Hatch Insulation

    Attic hatch insulation turns a thin, drafty access lid into part of the insulated ceiling. We gasket the frame and glue a thick stack of foam board onto the lid, so the hatch holds heat like the attic around it.

  6. Dark water stain on attic roof boards above damp, matted cellulose insulation

    Ice Dam Prevention

    Ice dam prevention aims to hold the roof deck at outdoor temperature, so high snow stays frozen instead of melting and refreezing at the eaves. In practice that means sealing the ceiling, keeping soffit air moving and bringing the attic insulation to full depth.

  7. Old, thin cellulose insulation lying on an attic floor under bare roof framing

    Attic Insulation Rebate

    A Newmarket owner whose thin attic is brought up to R-50 may qualify for an attic insulation rebate under Home Renovation Savings, the province-wide program run jointly by Save on Energy and Enbridge Gas. The thinner the attic was, the larger the attic insulation rebate.

  8. Pink fiberglass batts laid between joists across a wide, lit attic

    Attic Insulation Cost

    Four things drive attic insulation cost in Newmarket: how big the attic is, which material you pick, how many inches are already up there, and whether a clear-out comes first. Most homes pay between $1,500 and $3,500.

Ask For A Free Attic Check

Name the job and the decade your house was built, then expect a call back with a time.

Request Your Free Attic Check

Two or three lines on the house and the cold spots upstairs let us bring the right gear.

You can also call us at +1 (289) 210-8352

Thanks — your request has been received. Our office phones you back, normally by the next business day, to schedule the attic check. For anything urgent, call +1 (289) 210-8352.

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