Adding solar panels to your home sounds simple—but your roof might tell a different story. If it’s too old, damaged, or poorly built, it can cause problems later. Expensive ones. Before you go solar, your roof needs to be in the right shape to handle the job.
This guide will help you spot the early signs, avoid costly mistakes, and know what steps to take next.
Why Your Roof Comes First
Solar panels are built to last 25 years or more. That means your roof needs to last just as long—or you’ll be removing and reinstalling those panels down the line. That’s no small task. It’s also not cheap.
Across Ontario, solar energy is picking up speed. In fact, over half of the country’s solar capacity is already here. And with government goals pushing for more clean energy by 2030, now’s a smart time to consider it.
But no matter how good the panels are, a bad roof underneath will cut the benefits short. It’s like building on sand. Let’s start with the basics.
How to Know If Your Roof is Ready for Solar
Your roof doesn’t need to be perfect, but it does need to be strong enough for solar panels. Here’s how to tell if it’s up to the task—or if it needs a little work first.
Asphalt Shingle Roofs
Asphalt shingles are popular and easy to install, but they don’t last forever. In Ottawa’s tough climate, expect them to last around 20 years.
Here’s what to watch for:
- Curled edges: This can mean the shingles are aging and losing their strength.
- Bare spots: If you see areas where the granules are missing, it’s a sign of wear.
- Cracks or soft spots: Walk around the roof. If it feels weak or cracked, it’s a red flag.
- Age: Shingles older than 5–7 years are more likely to be worn down.
If you spot any of these, it might be best to replace the roof before installing panels. It’s better to fix it now than to deal with problems later.
Steel Roofs
Steel roofs handle Ottawa’s weather conditions much better. They can last between 40 to 70 years, especially with how the metal handles freezing and thawing.
If your roof is under 20 years old and in good shape, it’s likely good to go. Just check for any signs of wear, but overall, steel tends to last a long time.
What Roofers Look For Before Installing Solar Panels
Before your solar panels are installed, it’s crucial to check your roof. A good roofer will do more than just give it a quick once-over. They’ll look closely at both the outside and inside of your roof to make sure everything is in solid shape.
Exterior Checks: What’s Visible Matters Too
The roofer’s first step is checking the obvious stuff on the outside:
- Missing or curling shingles – If shingles are curling or missing, it usually means the roof has aged or been damaged by weather.
- Granules in the gutters – Asphalt shingles shed small granules over time. If you see a lot of them in your gutters, it’s a sign the shingles are wearing out.
- Nail pops or soft decking – If you press on your roof and it feels soft or you notice nails sticking out, that could signal a deeper problem with the structure.
- Leaks near vents, chimneys, or skylights – Old leaks can be tricky to find, but if water has seeped in once, it could cause issues later. Especially under solar panels, where it’s harder to spot.
Attic Checks: What’s Hidden Inside
Next, the roofer will head into your attic to check what’s happening under the roof:
- Wet or clumpy insulation – If your insulation is damp or looks clumped together, that means there’s moisture. Left unchecked, it can lead to mold and weaken the roof’s structure.
- Mold spots – Mold on the underside of the roof decking is a clear sign that moisture has been lingering. That can lead to damage that gets worse over time.
- Poor airflow – If your attic isn’t well-ventilated, moisture builds up. It’s essential to have good airflow to keep your roof healthy and prevent long-term damage.
Roofing Problems That Need to Be Fixed Before Solar Panels Go Up
Solar panels are meant to last for a long time. But for them to reach their full potential, they need to be installed on a roof that’s in good shape. If there are existing issues like leaks, poor airflow, or damaged shingles, those should be dealt with before adding solar panels.
What to Fix Before Installing Solar Panels:
- Leaks or water damage – If water is getting into your roof, that’s a big problem. You can’t install solar panels on a roof that’s leaking. Get those leaks sealed up before anything else.
- Mold or mildew in the attic – Mold is a sign that moisture is building up inside your roof. It often means the insulation or ventilation isn’t working properly. Fix this problem before it spreads and affects the whole roof.
- Damaged shingles or plywood – If the underlying wood or shingles are in bad shape, it can cause major problems later. The panels add weight, and a weak roof might not be able to handle it. It’s best to replace damaged parts now rather than after the panels are installed.
Why Fixing These Problems First Is Important:
- Long-Term Strength – Solar panels are heavy. If your roof isn’t strong enough to hold them, it could bend or crack over time. You want your roof to last as long as the panels do.
- Avoid Extra Costs – If you wait until after the panels are installed to fix a problem, you’ll end up paying twice: once to fix the roof, and again to remove and reinstall the solar panels. It’s much cheaper to take care of the roof first.
How Solar Panels Attach to Different Roof Types
Not all roofs are the same. And the way solar panels are installed can change depending on the type of roof you have. Here’s how it works for the most common materials:
Asphalt Shingle Roofs
Solar panels on asphalt shingles are usually mounted with bolts that go into the roof. This means:
- Drilling holes into the shingles (flashing is added to seal the holes properly)
- Sealants are used to keep water from leaking in
- The panels need to be spaced right to prevent water, snow, or debris from collecting under them
If this is done properly, your roof stays safe, and your warranty won’t be affected. But if corners are cut—like using cheap sealants or skipping the flashing—water can seep in and cause leaks. That’s when your warranty could be at risk.
Standing Seam Metal Roofs
Standing seam roofs are ideal for panels. Why? Because these roofs don’t need any drilling. Instead, clamps attach directly to the seams. Here’s why this is great:
- No holes = no leaks
- The roof’s structure stays intact, and your warranty stays protected
It’s a cleaner and safer method for your roof.
Other Metal Roofs
If you have a different type of metal roof, like corrugated steel, the installation process is a bit different. These roofs often need drilling to install the panels. In these cases, it’s even more important to make sure the flashing and sealant are done properly to prevent leaks and damage.
How the Installation Affects Your Warranty
Roof warranties can be tricky. Most roofing companies have rules about modifications, like drilling holes or adding mounts. If you don’t follow the proper steps, your warranty could be voided.
To avoid losing your roof warranty:
- Always use a certified installer like True Beacon, who follows the right steps.
- Talk to your roofer if your roof is under warranty and make sure the installation meets their requirements.
- Document everything — take before and after photos, and keep records of your inspections.
Your Pre-Solar Roof Checklist
Before you put up solar panels, check this list:
- Look at your roof—check the inside and outside.
- Find out how old your roof is and how much longer it can last.
- Change it if you have to—especially older roofs than 10–15 years.
- Don’t put panels over vents, skylights, or chimneys.
- Hire a certified installer.
- Get all the papers—keep a record of the inspection and the installation.
- Make attic ventilation better if you need to.
Why Choose True Beacon for a Smooth Installation Process
- Experienced and Certified Team
- Roof-First Approach
- Quality Work
- Clear Communication
- Warranty Protection
- Local Expertise
- Honest Advice
Ready to Go Solar the Right Way?
At True Beacon, we don’t just install panels. We make sure your roof is ready first. We take the time to inspect your roof, assess any problems, and work with trusted roofers if needed. With our expert team, your solar installation will go smoothly, and your roof will stay safe.
Visit truebeacon.ca to book your free roof and solar readiness check-up.
Frequently Asked Questions
What is the ideal condition of your roof for installing PV panels?
The best roof for solar panels is a strong and undamaged existing roof. It should have at least 10 to 15 years of life left. There must also be enough space for placing the panels. The structural integrity of the roof is important too, as it needs to support the additional weight of the panels and the mounting systems well.
How often should the roof be inspected post solar panel installation?
After you install panels, you should have your roof checked at least two times a year. These regular inspections help you keep track of the roof’s condition and solar system. This way, any possible problems can be found early. It helps keep everything working safely and efficiently.
Are there different roofing materials that work best with PV panels in Ottawa?
In Ottawa, the good roofing materials for solar panels are asphalt shingles and metal roofs. They are strong and work well with most mounting systems. These types of roofs can handle the weather in the area. They provide a steady base for your solar system installation.
What are the first steps a homeowner should take to prepare their roof for solar panels?
The first steps a homeowner should take to get the roof ready for solar panels include booking a professional inspection, fixing any repairs, and talking about the project with a trusted solar panel contractor. This helps make sure your roof is strong and meets the safety standards for a good installation.
How does the age of your roof affect solar power installation?
The age of your roof matters because older roofs may not be able to handle the weight of solar panels or the mounting system. If your roof is near the end of its life, it’s best to replace it before installing.
Can missing shingles affect my installation?
Yes, missing shingles can be a sign that your roof is not in the best shape. Before installing solar panels, these issues should be fixed to make sure the roof’s structure is solid enough for the panels.
What should I check before allowing a solar installer to start?
Before the solar installer begins, make sure your roof is in good shape. Schedule an inspection and take care of any necessary repairs. A well-maintained roof ensures a safer and more effective solar power system.
How does the roof’s material affect panel setup?
The roof material matters because some materials, like asphalt shingles or metal, are easier to work with for successful installations. The right roofing material ensures a smoother, more secure installation.
What roofing issues should I look out for before installing the panels?
Check for signs of damage like leaks, cracks, or missing shingles. Any roofing issues should be addressed before installing solar panels to make sure your roof can support the system.
How does the roof’s area influence solar panel placement?
The roof’s area needs to be large enough to hold all the PV panels and allow for proper spacing. This gives the panels enough room to collect maximum energy production without obstructing airflow or causing heat buildup.
Is my flat roof suitable for solar panels?
Yes, a flat roof can be a great option for PV panels, as long as it has a solid foundation and is in good condition. The roof’s suitability for installation depends on factors like the roof’s age and structural strength. A professional inspection will help ensure the roof can support the panels properly.