Same-week winter response

Snow & Ice Damage Repair in Canmore & the Bow Valley

Bow Valley-specific structural repair for snow-load sag, broken stair stringers, post heave, and ice-dam ledger damage. 48-hour on-site assessment, same-day shoring for safety-critical issues, written insurance documentation on every job.

What snow and ice damage repair covers

Snow damage is one of the few deck issues we treat as an emergency. A deck pulling away from the house, a collapsed stair stringer, or a mid-span sag past code-allowed deflection limits are all conditions that can fail catastrophically and need to be addressed within days, not months. Our snow damage repair service covers structural shoring (temporary or permanent), joist sistering and replacement, stair stringer rebuild, post and pier remediation after heave, ledger flashing replacement after ice-dam back-up, rim joist rot repair, and any rebuild work needed to restore the deck to current Alberta Building Code load standards (2.5 kPa ground snow load for the Town of Canmore).

Every job includes a written condition report and photographs suitable for insurance submission, and we'll work directly with your adjuster if you authorize it.

Signs you need this immediately

Visible mid-span sag in the deck surface - sight along the boards from the corner
Audible cracking, popping, or groaning under foot traffic or snow load
A gap opening between the deck and the house wall (ledger pulling out)
Cracked or split stair stringers, especially at the bottom riser
A post that's visibly tilted, lifted, or pulled off its base hardware
Water staining or rot showing on the rim joist below the deck after winter
Second-storey doors that suddenly won't close above living space

Our process - emergency timeline

Initial call and triage. Phone or web request. We assess severity over the phone and schedule on-site within 48 hours (same-day for collapse or imminent failure).
On-site assessment. Structural inspection, photographic documentation, written report with severity rating. Free if we do the repair, $285 standalone.
Temporary shoring (if needed). Same-day shoring with adjustable steel posts to take load off failing members until permanent repair.
Insurance liaison. Report and photos submitted to your insurer; we'll wait on adjuster sign-off before doing non-emergency work if you prefer.
Permanent repair. Sister or replace failed members, rebuild stringers, re-flash ledger, replace heaved piers with helical piles below the 1.2 m frost line.
Re-inspection and warranty. Final walk-through, photo documentation of completed work, lifetime workmanship guarantee on everything we installed.

Common damage types and repair scope

Damage type	Typical cause	Repair scope	Cost range
Joist sag past L/360	Snow load on pre-2010 deck (1.9 kPa spec)	Sister joists, add mid-span beam	$2,500–5,500
Broken stair stringer	Ice loading, freeze-thaw cycling	Replace stringer, re-secure treads	$1,200–1,800
Ledger flashing failure	Ice-dam back-up under metal roof	Pull boards, re-flash, replace rim if rotted	$3,500–8,000
Post heave / tilt	Sonotube above 1.2 m frost line	Helical pile retrofit below frost	$1,800–3,500/post
Catastrophic structural failure	Severe overload, multiple failure points	Partial or full rebuild	$15,000+

What drives the cost

Extent of structural damage - single joist vs. full re-engineering of the deck load path.
Access and shoring complexity - second-storey decks and steep-slope yards add labour for shoring and material handling.
Permit requirement - major structural repair triggers a Building Permit ($350–950 fee plus engineering letter if > 0.6 m off grade).
Materials replaced - sister joists are cheap; re-flashing a ledger with cedar siding pull-back is labour-intensive.
Insurance documentation depth - basic report included; formal engineered letter for adjuster +$650–1,200.

Bow Valley local context - why we see this so often

The Town of Canmore design ground snow load is 2.5 kPa (≈52 psf), but real-world events have pushed past that. The 2022–23 winter delivered roughly 3.1 kPa peak loads in parts of the Bow Valley - close to the 1-in-50-year event - and we ran our highest-ever snow-damage call volume that spring. Decks built before the 2010 NBCC code update were typically sized to 1.9 kPa snow load, which is functionally inadequate for any heavy winter; those decks are the bulk of our snow-damage work.

Canmore's 1.2 m frost depth drives the post-heave pattern: any concrete pier set shallow lifts each spring and over 5–8 years pulls the entire deck out of square. Ice-dam ledger failure is concentrated in the Three Sisters, Silvertip, and parts of Cougar Creek where steep metal roofs shed snow that re-freezes into ice dams above attached decks - the back-up forces water behind the ledger flashing and rots the rim joist. We carry shoring posts and helical pile heads on every truck from November through April specifically for this work.

For Banff, ice-dam patterns are nearly identical and the same response timeline applies; Parks Canada permits are generally waived for emergency structural repair but we file post-repair documentation.

Why choose Canmore Deck Builders for snow damage repair

We staff for winter response

From November through April we keep one crew permanently in winter-response mode - meaning a 48-hour on-site assessment window for every snow damage call. Most general contractors won't even quote winter structural work; we treat it as a core service.

48-hour on-site assessment guarantee · same-day shoring for collapse risk

Insurance-ready documentation on every job

Every assessment includes a written report with photographs, code references, and a clear cause-of-damage statement. We've had zero claims rejected on the basis of our documentation in 8 years of working with Bow Valley insurers.

Repair to current code, not original spec

When we sister joists or rebuild a section, we bring it up to the current 2.5 kPa snow load standard - not back to the 1.9 kPa spec it was originally built to. Same lifetime workmanship guarantee as new construction on everything we install.

Available across the Bow Valley

We deliver this service in Canmore, Banff, Exshaw, Dead Man's Flats, and Kananaskis.

Related services

Common Questions

Snow & ice damage repair - FAQ

How fast can you respond to snow damage?

Same-week for safety-critical issues - collapsed stair stringers, deck pulling away from the house, visible joist failure. We carry an emergency slot in the schedule from December through April for exactly this. On-site assessment within 48 hours of your call, temporary shoring same day if needed.

What does snow damage repair typically cost?

$1,200–8,000 for most jobs. A single stair stringer replacement runs $1,200–1,800; sister-joist work for snow-load sag $2,500–5,500; full ledger flashing rebuild after ice-dam damage $3,500–8,000. Major structural rebuilds after collapse can exceed $15,000 and we handle the insurance documentation.

Will my insurance cover snow damage to my deck?

Usually yes if the damage is from a single event (record snow load, ice-dam back-up). Gradual wear, frost heave over years, and deferred maintenance are typically excluded. We provide a written report with photos and code references - accepted by every Bow Valley insurer we've worked with. Submit before doing the repair if possible.

What kind of snow damage do you see most often in Canmore?

Three patterns dominate. First, mid-span joist sag past L/360 deflection limit after a heavy winter - common on decks sized to the old 1.9 kPa code rather than current 2.5 kPa. Second, broken stair stringers from compacted ice loading the bottom rise. Third, ledger flashing failure from ice-dam back-up under a metal roof valley, leading to rim joist rot the next spring.

Can you repair in winter or do I have to wait until spring?

Most snow damage work can be done immediately. Joist sistering, stringer replacement, temporary shoring, and ledger flashing repair all work at winter temperatures. Concrete and helical pile work for post heave can also be done year-round (helical piles install in frozen ground with cold-rated drive heads). The only work we delay is staining or membrane re-flashing, which need above-freezing temps.

How do I know if my deck is overloaded right now?

Visible mid-span sag, doors that suddenly won't close on a second-storey deck above living space, audible cracking under load, or visible gaps opening between the deck and the house wall. If you see any of these after a snow event, clear the deck (people first, then snow if safe to do so) and call us. We treat these as same-day calls.

Snow or ice damage to your deck? Call now.

48-hour on-site assessment, same-day shoring for safety-critical issues, insurance-ready documentation on every job.

Request emergency response Call 403-678-2345