Why Winter Is a Critical Time for Cedar Roofs

Ontario’s harsh winters – think heavy snow, freeze-thaw cycles, ice dams and wind-driven storms – pose special risks for cedar roofs. What might be a small issue in fall can turn into a major leak or structural damage by spring. Replacing or repairing your cedar roof before or early in winter can save thousands in repair costs and give you peace of mind through the cold months.

How Winter Weather Impacts Cedar Roofs

• Freeze-thaw stress: Moisture seeps into cracks or between shakes/shingles and freezes, expanding and causing splits or warping.

• Ice dam formation: As snow melts on a warm roof and refreezes at the eaves, water can back up under cedar shakes and damage the deck. (More info here)

• Reduced drying time: Shorter days and colder temperatures mean the roof stays wet longer; a damp cedar roof is more prone to rot or moss growth.

• Installation & repair complications: Cold temperatures affect materials and installation quality. For example, one guide notes that installing shingles below ~4 °C leads to brittle materials and poor sealing. Learn more here!

Should You Repair or Replace Your Cedar Roof Before Winter?

Repair may be sufficient if:

• The roof is under ~20 years old and issues are limited to a few shakes or shingles.

• Ventilation and underlayment are in good condition but minor fixes (flashing, moss removal) are needed.

Replace is often the better option if:

• The roof is 20+ years old, shows widespread curl/cup of shakes, significant moss/rot, or multiple leaks.

• The underlayment or structure has been compromised by previous damage.

• You want to “winter-proof” against major storm damage or ice-related failures.

According to roofing industry guidance, winter replacement is indeed feasible and sometimes even advisable — “contrary to some preconceptions… roof replacement work can be done during the cold wind and temperatures of a Toronto winter. (More info.)

Replacing a Cedar Roof in Winter: What You Should Know

• A qualified contractor will ensure the roof deck is clean and dry before laying new cedar; cold and wet decks are one of the biggest risks.

• Some modern underlayments and fasteners are rated for cold-weather installs; as one article notes, “while replacing your roof in winter might not be something you initially consider, there are many advantages…mitigating structural risks… enhanced adhesion.” (Source)

• Safety is key: slippery roofs, ice, and changing daylight make winter installs more challenging – ensure your contractor uses proper gear, safe practices and is experienced in winter conditions.

Essential Winter-Proofing Maintenance Tips

1. Clear gutters and downspouts in the autumn so melting snow and ice have a clear exit path.

2. Inspect attic ventilation and insulation – warm attics cause snow to melt unevenly, increasing ice-dam risk. (Poor ventilation is a major cause of ice dams.) Dominion Roofing

3. Look for moss, algae or curling shakes before snow flies. These issues trap moisture and increase risk of damage over winter. (One Ontario cedar-roof specialist recommends a fall inspection to avoid “freeze-thaw-cycle” damage.) jdwoodrevival.com

4. Remove heavy snow safely after major storms, especially from valleys or eaves. Avoid using high-pressure methods that can damage cedar.

5. Schedule an inspection early in winter. If you see warning signs—large icicles, water stains, sagging areas—act quickly to prevent interior damage.

Why JD Wood Revival Is Your Winter Cedar Roof Specialist

• We specialise solely in cedar roofing and siding, with deep experience in Ontario’s climate.

• We use materials and installation techniques that account for freeze-thaw cycles, ice dam threats and other winter stresses.

• We provide detailed inspections and honest recommendations: when a repair will suffice, and when a full replacement is the smarter investment.

• We offer winter scheduling flexibility—so you don’t have to wait until spring while your home remains vulnerable.

 

Ready to protect your home this winter?
Book your pre-winter cedar roof inspection with JD Wood Revival today and find out whether you need a repair or full replacement. Don’t wait until leaks appear under the snow.

Contact us to get started.