Your roof is the first line of defence against London, Ontario's unpredictable weather. From heavy snowfall and ice storms in winter to severe thunderstorms in summer, your roofing system takes a beating year-round. Regular roof maintenance is the single most effective way to extend the lifespan of your roof, prevent costly emergency repairs, and protect your family and belongings.
At London Roofers, we have seen firsthand how a little preventive care can save homeowners thousands of dollars. Whether you have asphalt shingles, metal roofing, or another material, this comprehensive guide covers everything you need to know about keeping your roof in top condition throughout the year.
Seasonal Roof Maintenance Checklist
London experiences four distinct seasons, each bringing its own challenges for your roof. Following a seasonal maintenance schedule ensures nothing gets overlooked.
Spring Maintenance (March - May)
After the harsh Ontario winter, spring is the ideal time to assess any damage and prepare your roof for warmer months.
- Inspect for winter damage: Look for missing, cracked, or curling shingles caused by freeze-thaw cycles. Pay close attention to areas around chimneys, skylights, and vents where ice may have caused flashing to lift.
- Clean gutters and downspouts: Remove debris that accumulated over winter. Clogged gutters lead to water backing up under your roofing material, which can cause rot and interior leaks. Our gutter services team can handle this for you.
- Check for moss and algae growth: The damp spring conditions in London encourage moss growth, particularly on north-facing slopes. Moss traps moisture against your shingles and accelerates deterioration.
- Inspect the attic: Look for signs of moisture, water stains, or daylight coming through the roof boards. Check insulation for dampness or compression.
- Trim overhanging branches: Cut back any tree branches within two metres of your roof to prevent abrasion damage and reduce debris accumulation.
Summer Maintenance (June - August)
Summer heat and storms present different challenges for London homeowners.
- Inspect after severe storms: London regularly experiences thunderstorms with high winds and hail between June and August. After any significant weather event, do a ground-level visual inspection. If you suspect storm damage, contact a professional immediately.
- Check attic ventilation: Proper ventilation prevents heat buildup that can warp sheathing and prematurely age shingles. Your attic temperature should stay reasonably close to the outdoor temperature.
- Look for UV damage: Prolonged sun exposure can cause shingles to crack, blister, or lose protective granules. Check for bare spots or granule accumulation in your gutters.
- Inspect caulking and sealants: Heat can cause sealant around flashing, vents, and pipe boots to dry out and crack. Reseal any gaps you find.
Fall Maintenance (September - November)
Fall maintenance is critical preparation for London's demanding winter season.
- Thorough gutter cleaning: Leaves from London's many mature trees can quickly clog gutters and downspouts. Clean them at least twice during fall, once after the majority of leaves have fallen.
- Complete a full roof inspection: This is your last chance to address issues before winter. Look for damaged or missing shingles, deteriorating flashing, and any signs of wear. Consider scheduling a professional roof inspection and repair.
- Seal gaps and entry points: Wildlife such as squirrels and raccoons often try to enter attics through roof gaps before winter. Seal any openings around vents, soffits, and fascia boards.
- Check for proper drainage: Ensure water flows freely away from your foundation. Verify downspout extensions direct water at least 1.5 metres from the house.
Winter Maintenance (December - February)
London winters bring freezing temperatures, heavy snow, and ice. Limited maintenance is possible, but staying vigilant is important.
- Monitor snow load: After heavy snowfalls, check your roof from the ground for signs of sagging or stress. If snow accumulation exceeds 30 centimetres, consider having it professionally removed to prevent structural issues.
- Watch for ice dams: Ice dams form when heat escaping from the attic melts snow on the upper roof, which refreezes at the eaves. Look for large icicles hanging from gutters, as this is a telltale sign.
- Keep vents clear: Ensure roof vents and exhaust outlets are not blocked by snow or ice. Blocked vents lead to moisture buildup in the attic.
- Interior monitoring: Regularly check ceilings and walls for water stains, peeling paint, or damp spots that indicate a leak from above.
Ice Dam Prevention for London Winters
Ice dams are one of the most common and damaging roofing problems for homeowners in London and Southwestern Ontario. When warm air from your living space escapes into the attic, it heats the roof deck and melts the snow sitting on top. That meltwater runs down the roof slope until it reaches the colder eaves, where it refreezes into a ridge of ice. As more water backs up behind this ice ridge, it seeps under shingles and into your home.
Prevention starts with three key strategies:
- Proper insulation: Ensure your attic floor has adequate insulation (R-50 or higher is recommended for Ontario) to minimize heat loss from your living space into the attic.
- Adequate ventilation: A well-ventilated attic keeps the roof deck cold, preventing uneven snowmelt. Soffit vents should be clear and unobstructed, and ridge or roof vents should allow warm air to escape.
- Air sealing: Seal gaps around light fixtures, plumbing stacks, electrical wires, and the attic hatch to prevent warm air from leaking into the attic space.
Warning: Never attempt to remove ice dams with a hammer, chisel, or pressure washer. These methods can severely damage shingles and flashing. If you have an active ice dam causing leaks, call London Roofers at (226) 212-7268 for safe, professional removal.
Gutter Cleaning and Maintenance
Gutters play a vital role in your roofing system by directing rainwater and snowmelt away from your home. When gutters become clogged with leaves, twigs, and granules shed from aging shingles, water overflows and can damage your fascia, soffits, siding, and foundation.
London homeowners should clean their gutters at least twice per year: once in late spring and again in late fall after leaves have dropped. Homes surrounded by mature trees may need more frequent cleaning. During each cleaning, check for the following:
- Sagging gutter sections that need reattachment or bracket replacement
- Rust spots or holes in metal gutters
- Separated joints or leaking seams
- Downspout clogs, which you can test by running water through them
- Proper slope ensuring water flows toward downspouts
If your gutters are old or frequently clogging, it may be time to upgrade. Our gutter services include seamless gutter installation, which eliminates most joint leaks and reduces maintenance needs significantly.
Shingle Inspection: What to Look For
Whether your roof is covered in asphalt shingles or another material, regular visual inspections help you catch problems early. From the ground with binoculars, or safely from a ladder at the roofline, watch for these warning signs:
- Curling or buckling: Shingles that curl at the edges or buckle upward have lost adhesion and are vulnerable to wind lift and water infiltration.
- Missing shingles: Even one missing shingle exposes the underlayment and decking to moisture. Replace them promptly.
- Granule loss: Check your gutters for an excessive accumulation of dark granules. Some loss is normal on new roofs, but heavy shedding on older roofs indicates the shingles are nearing the end of their useful life.
- Cracking: Thermal cycling through London's wide temperature swings (from -25C to +35C over the course of a year) causes shingles to expand and contract, eventually leading to cracks.
- Dark streaks or staining: Black streaks are usually caused by algae. While not immediately damaging, algae can shorten shingle life over time if left untreated.
Professional Tip: If more than 20% of your shingles show signs of significant wear, patching individual shingles may not be cost-effective. A full roof replacement often makes better financial sense and comes with a new warranty.
DIY Maintenance vs. Professional Service
There are certain roof maintenance tasks that a handy homeowner can safely handle, and others that should always be left to licensed professionals.
Tasks You Can Do Yourself
- Visual inspections from the ground using binoculars
- Cleaning gutters from a stable ladder (with a spotter)
- Trimming tree branches that overhang the roof
- Checking the attic for signs of leaks, mould, or inadequate insulation
- Removing debris such as leaves and branches from valleys and low-slope areas
Tasks That Require a Professional
- Walking on the roof for close-up inspections (dangerous for homeowners and can void warranties)
- Replacing damaged or missing shingles and flashing
- Repairing structural damage to decking or rafters
- Addressing active leaks or water intrusion
- Ice dam removal and prevention installation
- Full roof repair or replacement projects
How to Extend Your Roof's Lifespan
A well-maintained asphalt shingle roof in London can last 20 to 30 years, while a properly cared-for metal roof can exceed 50 years. The following practices help you get the maximum life from your investment:
- Schedule annual professional inspections: Having a qualified roofer examine your roof once a year catches small problems before they escalate. Many issues that cost a few hundred dollars to fix can cause thousands in damage if ignored.
- Address repairs immediately: A small leak today becomes a rotted deck, damaged insulation, and mould problem tomorrow. Never postpone roof repairs.
- Maintain proper attic conditions: Balanced insulation and ventilation prevent premature aging from both heat buildup in summer and ice dam formation in winter.
- Keep the roof clean: Remove debris, moss, and algae before they cause material degradation.
- Document everything: Keep records of inspections, repairs, and maintenance. This is valuable for warranty claims and when you eventually sell your home.
When to Call a Professional Roofer
While routine maintenance can prevent many problems, some situations call for immediate professional attention. Contact London Roofers right away if you notice:
- Active water leaking into your home
- Visible daylight through roof boards in the attic
- A sudden spike in your heating or cooling bills (could indicate insulation failure from a roof leak)
- Sagging areas on your roof surface
- Storm damage including missing shingles, dented metal, or fallen debris
- Mould or mildew growth in your attic
Our team serves London and surrounding communities including St. Thomas, Dorchester, Komoka, Byron, Lambeth, Masonville, White Oaks, Westmount, and Old North. We offer free roof inspections and honest assessments of your roof's condition.