Town of Okotoks

Okotoks Siding Replacement and Hardie Installation

Okotoks is a separate municipality south of Calgary, with its own building services office and its own line in the building code’s climate tables. For a re-side, that changes two things compared with a job in the city: who we confirm the permit question with, and how the wall is insulated if exterior insulation goes on.

Two-storey homes on a gently rising street in Okotoks with foothills and open sky in the distance.

At a Glance

Permits issued by: Town of Okotoks
From our Evergreen office: About 20-25 minutes south on Highway 2
Postal prefixes: T1S

(587) 324-8484

The Homes and Buildings in Okotoks

Okotoks has been a town since 1904 and counted about 30,000 residents at the 2021 census, so its housing runs from its older core to its newer communities. We do not assume what is on a wall from the street name. Each house is assessed on what it actually carries, whether that is original vinyl, stucco, wood or fibre cement accents, and on what the sheathing and weather barrier look like once a test section comes off. A test section is the simplest way to avoid surprises once the full tear-off starts.

Energy is the angle that sets Okotoks apart. The town is home to the Drake Landing Solar Community, and a full re-side is the one time the outside of the wall is open for improvement. Continuous exterior insulation goes over the sheathing, the cladding is fastened through furring into the framing rather than into the foam, and the building code sets furring at a minimum of 19 × 38 mm lumber at no more than 600 mm on centre. Stone wool board such as ROCKWOOL Comfortboard 80 is vapour-permeable, which gives the wall good drying potential, while foam boards behave as vapour retarders once they are thick enough.

Behind any new cladding the weather barrier decides how the wall performs. Tyvek HomeWrap’s Canadian evaluation calls for a minimum 10 mm air space between the membrane and the cladding unless the cladding is deemed not to need one, and James Hardie’s Canadian evaluation calls for asphalt-impregnated building paper where planks go directly on the wall. So the practical choice is housewrap with a drained, vented furring cavity, or building paper with direct-applied HardiePlank. LP SmartSide, the engineered wood option, needs a weather barrier too, and 200 mm of clearance to grade in Canada.

Weather and Exposure

The building code’s climate table gives Okotoks 4920 heating degree-days, a moisture index of 0.4 and a January design temperature of −31 °C. Those 4920 degree-days put Okotoks in climate zone 6, while Calgary, Airdrie and Cochrane fall in zone 7A. With a moisture index of 0.4, the code does not require a capillary break behind cladding here, though some products and membranes require an air space regardless.

Wind is the documented weather story. In October 2017 local news reported powerful winds in Okotoks causing minor property damage, including siding damage at a local business and shingles lost from homes. Okotoks does not appear by name in the major hail loss reports we rely on, but the Insurance Bureau of Canada notes that Alberta has had at least one major hailstorm every year for two decades, so we specify cladding here with hail in mind as well as wind.

Neighbourhood Notes

Westmount

We assess each Westmount home on what its walls actually carry before recommending a material, and we open a small test section where the condition of the sheathing is in doubt.

Drake Landing

Home of the Drake Landing Solar Community. For owners interested in energy performance, a re-side can add continuous exterior insulation, detailed to the Okotoks climate zone rather than Calgary’s.

Cimarron and Sheep River Ridge

On a full re-side here we look at the weather barrier first, and choose between housewrap over a furred cavity and building paper under direct-applied fibre cement.

D’Arcy and Wedderburn

Where only part of a house needs work, accents such as HardiePlank or LP SmartSide on a front elevation can be upgraded on their own, and damaged panels on wind-exposed side walls repaired.

Crystal Shores and Air Ranch

The more wall area a home has, the bigger the cladding and insulation decision, and we lay out the options by elevation so the whole house does not have to be done at once.

Permits in Okotoks

Authority having jurisdiction: Town of Okotoks

The Town of Okotoks, not the City of Calgary, is the authority here. The Town says a residential building permit is needed for most construction, demolition and renovation projects, including renovating your home, and it lists minor repairs that do not affect structural integrity as not needing one: same-size window or door replacement, re-roofing with no structural work, and minor exterior repairs. Re-siding is not named on that page. Okotoks exempts minor exterior repairs; a full re-side is confirmed with the Town’s permit services first. Provincially, Alberta’s Permit Regulation exempts re-siding with a similar type of siding, for maintenance or appearance and with no structural change, but adding exterior insulation or changing cladding type can take a project outside that exemption, which is another reason we ask the Town before we start.

What Okotoks Homes and Buildings Need Most

Continuous Exterior Rigid Insulation (CI)

Rigid foam or stone wool over the sheathing to stop heat escaping through the studs.

Weather-Resistive Barrier (WRB) & Housewrap

Tyvek, building paper or self-adhered membrane, lapped, taped and flashed.

Rain Screen & Cavity Ventilation Systems

Furring or drainage mat leaving a drained, vented gap behind the cladding.

LP SmartSide Engineered Wood Siding

Engineered wood lap and panel siding, detailed for Canadian clearances.

HardieBoard & HardiePlank Lap Siding

Smooth or wood-grain fibre cement lap planks, laid out course by course

Every service we offer

Close to Okotoks

Southwest Calgary

Evergreen, Shawnessy, Bridlewood, Somerset, Signal Hill, Aspen Woods and the inner SW.

Southeast Calgary

Chaparral, Walden, Legacy, Mahogany, Auburn Bay, Cranston and McKenzie Towne.

Siding in Okotoks: Questions

Do I need a permit from the Town of Okotoks to replace my siding?

The Town’s permit page exempts minor exterior repairs but does not mention re-siding either way. Under the provincial Permit Regulation, replacing siding with a similar type, for maintenance or appearance and with no structural change, is generally exempt, while changing cladding type or adding exterior insulation may not be. Because the page is silent on siding, we confirm a full re-side with the Town’s permit services before work starts.

Is exterior insulation different in Okotoks than in Calgary?

Slightly. Foam boards outside the sheathing act as vapour retarders, so the code sets how much of the wall’s insulating value must sit outside them to keep the sheathing warm and dry. At 4920 degree-days Okotoks uses a minimum ratio of 0.20, where Calgary, at 5000, uses 0.30. We still size the foam to the actual wall, and vapour-permeable mineral wool board avoids the question.

What do you do differently on a wall exposed to strong wind?

We follow the manufacturer’s fastening instructions exactly. James Hardie prefers blind nailing and allows face nailing only where code requires it for high wind areas, never mixed with blind nailing. Vinyl is nailed in the centre of its slots so it can move. House wrap is lapped at least 100 mm, upper over lower, and taped at openings, and kickout flashing goes where a roof edge ends against a wall.

Siding Work in Okotoks?

Call or send the details. Calgary Siding Solutions works from Calgary, and we will tell you what the job needs before we price it.

(587) 324-8484 Send the Details