Replacing your roof is a major home improvement project, but understanding the process can make it much less stressful. If you’re planning a roof replacement in London Ontario, knowing what happens at each stage will help you prepare your home and feel confident throughout the project.
A professional roofing company follows a structured process to ensure your new roof is installed safely, efficiently, and built to last through Ontario’s changing weather conditions.
Below is a simple breakdown of what homeowners can expect during the roof replacement process.
Step 1: Roof Inspection
The first step in any roof replacement project is a professional roof inspection. A qualified roofing contractor in London ON will examine the current condition of your roof to determine whether repairs are possible or if a full replacement is necessary.
During the inspection, contractors typically look for:
Damaged, cracked, or missing shingles
Signs of leaks or water damage inside the attic
Issues with flashing around chimneys, vents, or skylights
Sagging areas or structural concerns
Poor ventilation that may shorten roof lifespan
After the inspection, the contractor will explain the condition of your roof and provide recommendations based on their findings. They will also provide an estimate and timeline for the project.
Step 2: Choosing Roofing Materials
Once you decide to move forward with a roof replacement in London Ontario, the next step is choosing the right roofing materials.
Your roofing contractor will guide you through the available options and help you choose materials that match your home’s style, budget, and durability needs.
Some of the most common roofing materials include:
- Asphalt Shingles – The most popular roofing material for homes in Canada. Asphalt shingles are affordable, reliable, and typically last 20–25 years.
- Architectural Shingles – A thicker and more durable version of traditional asphalt shingles. They offer better wind resistance and improved curb appeal.
- Metal Roofing – Metal roofs are extremely durable, energy efficient, and can last 40–70 years with proper installation.
Your contractor may also help you select shingle colours and styles that complement your home’s exterior.
Step 3: Preparing for the Project
Before the roofing work begins, it’s helpful to prepare your home and yard for the project. Roof replacement can be noisy and involves heavy materials, so a little preparation can help the process go smoothly.
Homeowners may want to:
Move vehicles away from the driveway or garage
Remove outdoor furniture or decorations near the house
Cover or store items in the attic to protect them from dust
Secure fragile wall hangings or decorations inside your home
Most roofing companies in London Ontario will also take steps to protect your property, including covering landscaping, windows, and other surrounding areas.
Step 4: Removing the Old Roof
Once the project begins, the roofing team will start by removing the old shingles and roofing materials. This process is known as the tear-off.
Removing the existing roof allows contractors to inspect the structure underneath and ensure there are no hidden issues.
During this stage:
Old shingles and underlayment are removed
Nails and damaged materials are cleared away
Debris is collected and disposed of properly
Professional roofing companies use tarps and dumpsters to keep the work area organized and safe.
Step 5: Repairing the Roof Deck
After the old roof is removed, contractors will inspect the roof deck, which is the wooden base that supports the roofing materials.
If any sections of the roof deck are damaged, rotting, or weakened by moisture, they will be repaired or replaced before the new roof is installed.
This step is extremely important because a strong roof deck ensures the new roofing system will last for many years.
Step 6: Installing Protective Layers
Before installing the new shingles or roofing material, contractors install several protective layers designed to prevent leaks and improve durability.
These layers typically include:
- Ice and Water Shield – A waterproof barrier placed in vulnerable areas such as roof edges and valleys to prevent leaks caused by ice dams.
- Roofing Underlayment – A protective layer installed between the roof deck and shingles that adds another level of moisture protection.
- Drip Edges – Metal strips placed along the edges of the roof to guide water away from the structure and into the gutters.
These materials are especially important in London Ontario’s climate, where snow, ice, and heavy rain can put extra stress on roofing systems.
Step 7: Installing the New Roof
Once the protective layers are installed, the roofing team begins installing the new roofing materials.
This stage includes several important steps:
Installing starter shingles along roof edges
Laying shingles or metal panels across the roof surface
Installing flashing around chimneys, vents, and skylights
Ensuring proper roof ventilation for attic airflow
Proper installation is critical for the longevity of your roof. A professional roofing contractor in London Ontario will follow manufacturer guidelines and local building standards to ensure everything is installed correctly.
Step 8: Final Inspection and Cleanup
After the new roof has been installed, the roofing team will conduct a final inspection to ensure the project was completed properly.
They will check for:
Correct shingle alignment
Proper flashing installation
Secure ventilation components
Overall roof appearance and functionality
The team will also clean the work area thoroughly. This typically includes removing leftover materials and using magnets to collect stray nails around your property.
A reputable roofing company in London Ontario will always leave your home clean, safe, and ready to enjoy your new roof.
How Long Does a Roof Replacement Take?
Most residential roof replacements are completed within one to three days, depending on several factors.
These may include:
The size and complexity of the roof
Weather conditions
The type of roofing materials used
Whether structural repairs are required
Before starting the project, your roofing contractor will provide an estimated timeline so you know what to expect.
Work With a Trusted Roofing Contractor in London Ontario
Replacing your roof is a significant investment, but with the right roofing professionals, the process can be smooth and stress-free. Experienced contractors ensure your new roof is installed correctly and designed to withstand the changing weather conditions in Ontario.
If you’re planning a roof replacement in London Ontario, working with a trusted local roofing company ensures quality workmanship, durable materials, and long-lasting protection for your home.