New roofs in a growing city
Airdrie keeps growing, and not only in new subdivisions. Homeowners across the city are adding bedrooms over garages, building rear additions and sunrooms, putting up detached garages and workshops, and replacing older houses in the established core with new infills. Around the city, acreages near Airdrie, Crossfield and Balzac add shops, barns and new homes of their own.
Every one of those projects needs a roof. And every one of them has to stand up to the same conditions as the rest of the city: hail along the QEII corridor, northwest wind across open prairie, heavy snow and repeated freeze-thaw.
This page is about roofs on new structures. If you’re replacing the roof on an existing house — including a builder-grade roof that has worn out early — see roof replacement.
Projects we install new roofs on
Additions. Rear additions, bump-outs, sunrooms and second storeys over garages, tied into the existing roof.
Detached garages and workshops. Pitched shingle or metal roofs, or low-slope EPDM on lower garages.
Custom homes and infills. Full roof systems on new houses, including the infills replacing older homes in Old Town Airdrie.
Covered porches, decks and carports. Often low-slope, tied into the house wall.
Acreage buildings. Shops, barns and outbuildings around the city, often in metal. See metal roofing.
Where new meets old: tie-ins
On an addition, the most important part of the new roof is where it joins the existing one. That’s where water from two roofs meets, where two sets of framing move differently through the seasons, and where most addition leaks begin.
A proper tie-in means:
- Opening the existing roof far enough back to weave new underlayment and shingles into the old, rather than butting them together
- Ice-and-water shield across the whole junction and in any new valleys
- Step flashing and counter-flashing where the new roof meets an existing wall, with kick-out flashing at the bottom so water is sent back onto the roof
- Crickets behind any wall or chimney that would otherwise trap water and snow
- Ventilation planned for both roofs, so the new attic space doesn’t cut off airflow to the old one
Designing a new roof for Airdrie’s weather
When you’re building from scratch, you get to make choices that are expensive to change later.
Specify Class 4 from the start. Builder-grade shingles are the reason so many Airdrie roofs need work within a decade. Class 4 impact-resistant shingles cost more per square foot, but far less on a new build than as a later upgrade, and they may qualify for an insurance credit.
Plan the pitch. Steeper roofs shed snow and water faster. Very low pitches need a membrane rather than shingles — see rubber roofing.
Keep the roof simple where you can. Every valley, dormer and wall junction is a detail that has to be flashed perfectly. Simple roof lines are cheaper to build and easier to keep watertight.
Design ventilation properly. Balanced intake and exhaust keep the attic cool in summer and dry in winter, and help prevent the ice dams and attic frost that cause so many winter leaks in Airdrie.
Detail for wind. Starter strip on eaves and rakes, the high-wind nailing pattern and wind-rated ridge caps — especially on exposed lots on the edges of the city like Reunion.
Detached garages in Airdrie
Detached garages are one of the most common new roofs we see, especially on laned lots and on older properties where a new garage replaces a tired one. A few things are worth getting right:
- Pitch and material. A garage roof with enough slope can take the same shingles as the house, so the property looks consistent. A low-pitched garage roof needs a membrane such as EPDM.
- Match the house — or upgrade both. If the house roof is due soon, it may make sense to plan both roofs together.
- Ventilation. Even an unheated garage needs air moving through the roof space to keep moisture from building up on the underside of the deck.
- Snow sliding. On metal garage roofs, plan where snow will land, especially over doors and walkways.
- Hail. Garage roofs take hail just like houses. Specifying Class 4 shingles on the garage as well as the house keeps a storm from damaging one while sparing the other.
Working with builders and designers
On custom homes, infills and larger additions, we work as the roofing trade within your builder’s schedule. That means reviewing the plans for roofing details early, fitting into the framing and dry-in sequence, and coordinating the flashing with the window, siding and stone installers so each layer laps the one below it in the right order. Most roof leaks on new construction happen where trades meet, so those handoffs get as much attention as the roof itself.
How a new roof installation works
- Plans review or site visit. We look at the drawings or the framing and confirm materials, pitch and details.
- Written quote. Every component — underlayment, ice-and-water shield, flashing, ventilation, shingles or membrane — on its own line.
- Scheduling with your build. We coordinate with your builder or framer so the roof goes on as soon as the deck is ready, getting the structure dried in quickly.
- Deck check. New sheathing is inspected for damage, gaps and fastening before anything covers it.
- Installation. Membranes, underlayment, drip edge, starter, flashing, roofing and ventilation installed to the manufacturer’s high-wind specification.
- Tie-in and flashing. Where the new roof meets the old house, walls, windows, siding or stone, we coordinate with the other trades so each layer laps correctly.
- Cleanup and walkthrough.
Materials for new roofs
- Asphalt shingles — the most common choice, ideally Class 4
- Metal roofing — long life, sheds snow, popular on garages and shops
- Rubber roofing (EPDM) — for low-slope sections, porches and garages
- Cedar shakes — for the right architecture, with fire rating and maintenance in mind
What a new roof costs in Airdrie
| Material | Typical cost | Notes |
|---|---|---|
| Architectural shingles on new framing | $4.50–$6 / sq ft | Per sq ft — no tear-off. |
| Class 4 from day one | $6–$8 / sq ft | Per sq ft — no tear-off. |
| Low-slope rear addition in EPDM | $2,500–$5,000 | About 250–400 sq ft. |
| Metal on a detached garage | From $10 / sq ft | Per sq ft. |
Get an exact quote for your roof
Roof area, pitch, complexity and tie-ins to existing roofs drive the final price. For every factor, see the Airdrie roofing cost guide; low-slope garage and addition roofs are priced in the flat roof cost guide.
New roofs across Airdrie
We install new roofs on additions, garages and new builds across the city — infills in Old Town, additions and garages in King’s Heights, Cooper’s Crossing and Hillcrest, and exposed builds in Reunion — plus acreages around Crossfield and Balzac.