Serving Kanata, Stittsville & the rural west end of Ottawa

Free written estimates · +1 (343) 301-5498

Attic air sealing plugs the holes in your top-floor ceiling where heated indoor air sneaks up under the roof. Loose fill slows heat soaking through drywall, yet air pours through an open hole as if the fill were not there.

That is why the sealing is done first and the insulation second. Every house has these gaps. Pot lights, plumbing stacks, wires, bathroom fans, chimney chases and the tops of interior walls all leave openings in the attic floor. Attic air sealing closes them with caulk, foam, gaskets and fire-safe materials where heat is present.

Attic Air Sealing details

Attic Air Sealing Prevents Frost And Attic Rain

Ottawa can sit below minus fifteen for days on end. In that stretch, any indoor air slipping into the attic leaves its moisture behind as frost on nails and sheathing. A thaw sends it dripping onto the fill and the drywall, so a February stain on an upstairs ceiling is often an air leak and not a bad shingle.

Attic air sealing removes the source. With the ceiling sealed, far less warm, damp air reaches the roof, so far less frost can form. Good ventilation then carries off what is left. Our attic ventilation and baffles page covers that half.

Where We Seal In A Kanata Attic

The biggest holes are tackled first: the plumbing stack, chimney or flue chases, and the open soffit boxed in over kitchen cabinets or a tub. Smaller ones follow, such as pot light cans, cable holes and the long gap where each inside wall meets the ceiling. Near anything hot, sheet metal and fire-rated caulk do the job, and loose fill is held back the required distance.

The hatch gets its own treatment. Our attic hatch insulation page explains how we weatherstrip and insulate it.

Attic Air Sealing Is Easiest Before A Top-Up

After seventeen inches of fresh fill land on the ceiling, nobody will reach those holes again without digging. So attic air sealing is always booked into the same visit as the top-up or the clear-out. An emptied attic is the easiest place of all for attic air sealing.

Attic Air Sealing Price

Attic air sealing is quoted as a lump sum, commonly $500 to $1,500 for a Kanata home. The count of holes and the headroom in the attic set where it falls, and it appears as a separate line.

Ask For A Free Attic Check

Call (343) 301-5498 and we will find the leaks, photograph them and price the attic air sealing in writing. All of our services are on the Kanata attic insulation home page.

Attic services

Work That Often Goes With This Job

Most Kanata attics get two or three of these done in the same visit, which saves a second trip.

Deep white blown-in fiberglass under the truss webs, with soffit vents along the eaves

Blown-In Fiberglass Insulation

Blown-in fiberglass insulation is loose glass fibre blown through a hose into the attic, where it builds a light, even layer over the ceiling. It does not absorb water and it does not settle much, which makes it a steady choice for an attic that will be left alone for decades.

View Blown-In Fiberglass Insulation
Worker in coveralls vacuuming old cellulose insulation out of an attic

Attic Insulation Replacement

Attic insulation replacement is a clear-out and a refill: the old layer is vacuumed away, the attic is cleaned, and new loose fill goes in to R-60. It is the answer when the existing material is soaked, mouldy, fouled by animals or crushed flat.

View Attic Insulation Replacement
Yellow batt insulation between attic joists, with vent baffles along the eaves

Attic Ventilation And Baffles

Attic ventilation lets outside air enter at the soffits and leave near the peak, which keeps the attic close to the outdoor temperature and carries moisture away. A cold, dry attic means snow melts less from below, the roof boards stay sound and the insulation stays dry.

View Attic Ventilation And Baffles
Installer laying pink batt insulation between sloped attic rafters

Bonus Room Insulation

Bonus room insulation fixes the room that sits over an attached garage and never feels like the rest of the house. That room has a cold garage under its floor, short knee walls with attic space behind them and a sloped ceiling under the roof.

View Bonus Room Insulation

Book Your Free Attic Check

Name the job and the year the house was built, and the office will phone to pick a day.

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Tell Us About Your Attic

Two or three lines about the house and its cold rooms make the photo check go faster. Calls go to +1 (343) 301-5498.

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