Is It Safe to Install Solar Panels on an Asbestos Roof: A Factual Guide!

There are three kinds of roofs commonly found in residences and commercial buildings: an RCC roof, a metallic roof, and an asbestos roof. While solar can be installed on RCC and metallic roofs, it is not advisable to install solar on an asbestos roof.

To install solar panels on an asbestos roof, installers drill mounting brackets straight into the cement sheets. But most professionals won’t recommend this. Drilling into asbestos releases harmful fibres into the air. The material also isn’t strong enough to carry the weight of panels and mounting structures for decades. If your roof gives out before your solar system does, you’re stuck replacing a hazardous roof with live solar equipment sitting on top of it.

You must replace the asbestos roof with something stronger, like metal or RCC, before you install solar. In this guide, we will walk you through whether it is safe to install solar panels on an asbestos roof, how people try to do it, and what you should do instead if your roof is made of asbestos cement sheets.

Can Solar Panels be Installed on an Asbestos Roof?

Between the 1980s and 1990s, asbestos cement sheets became very popular for roofing. They were cheap, fireproof, and gave decent insulation from heat and rain. That is why so many garages, farm sheds, factories, and even homes across India still have them today.

It did not take long for the world to learn that these sheets were a serious health hazard. India also banned asbestos mining in the year 1993; however, the country is one of the world’s largest importers of chrysotile asbestos.

Source: Elchemy

Asbestos fibres are carcinogenic (can cause cancer). Research has linked asbestos fibres to serious lung diseases, including cancer, when the material is cut, drilled, or broken. This is exactly what happens when someone tries to mount solar panels directly onto it.

So, can solar panels be installed on an asbestos roof? Technically, yes, some installers will do it. But at SolarSquare, we do not recommend it, and we will explain exactly why in the next section.

Solar Panels on Cement Sheet Roof: What Is the Real Risk?

An asbestos roof is really a cement sheet mixed with asbestos fibres to make it hard and weatherproof. This is why people also search for solar panels on a cement sheet roof, even though they mean the same thing.

The cement gives the sheet its shape, but the asbestos fibres are what make it brittle over time and dangerous to cut, drill, or walk on repeatedly. That combination is exactly what makes solar panel installation on an asbestos roof a risky idea.

Solar Panel Installation on Asbestos Roof: Top 3 Reasons to Avoid It

Here are the three biggest reasons why solar on an asbestos roof is not a good idea, explained simply.

#1. Asbestos Sheets Cannot Handle the Load

A rooftop solar system creates two kinds of load on a roof. Static load comes from the weight of the panels and the mounting structure itself. Dynamic load comes from the weight of installation and maintenance workers moving on the roof.

A 1 kW solar system on a mounting structure of 6-9 feet on an RCC roof weighs about 25-30 kg per square metre, and every 1 kW system needs roughly 10 square metres of space. Asbestos sheets simply do not have this kind of load-bearing capacity.

Asbestos sheets just don’t have this kind of load-bearing capacity.

• Under constant static and dynamic load, asbestos sheets can collapse.
• Under pressure, they start developing cracks, giving way to water.
• Water seeping inside the cracks causes humidity. It compromises the structural strength of the building.
• Moisture and humidity can easily rust or corrode the mounting structures, especially if those structures aren’t properly galvanised with zinc.
• Moisture is a major concern when there’s electrical work going on under the shed. It’s a health concern in general too since it harbors germs and all sorts of organic growth.

So, no matter the angle you choose to look at, asbestos sheets aren’t ideal candidates for the installation of solar panels.

#2. Asbestos Sheets Do Not Have a Long Life

You expect them to last for a lifetime, but they don’t. Asbestos sheets have a pretty short life since they start losing their strength as soon as you start walking on them.

Imagine how drastically their life will deteriorate when a solar system is installed on them. Besides, experts will have to frequently walk on those sheets for maintenance of the solar panels post-installation.

When somebody installs a solar system, it’s with the hope that the system will last for a minimum of 25 years. When the roof on which the system has been installed won’t have a long life, how would the system last?

#3. It Is a Safety Risk for Installation and Maintenance Workers

As mentioned, asbestos sheets tend to give in very easily when subjected to load. There’s a very high possibility that the roof might entirely come down during installation and maintenance.

These are major safety concerns.

Workers can get injured while working on an asbestos roof. That’s one major reason why a legacy solar installation company will never offer services for the installation of solar panels on asbestos sheet roofing and risk the safety of workers.

Roof Type Comparison: RCC vs Metal Roof vs Asbestos

*Disclaimer: Please note that the lifespan of the RCC, metal, and asbestos roof is commonly observed market estimates and may vary based on several factors. The lifespan of these materials depends on factors including material quality, installation, and workmanship, environmental and climatic conditions, moisture and chemicals, maintenance, structural loading, coating, and more.

Signs Your Asbestos Roof Is Already Too Weak for Solar

Even if you are still considering installing solar on asbestos sheets, you must be aware of some warning signs that you should not ignore.

• Visible cracks, chips, or holes anywhere on the sheets
• Sagging or uneven sections across the roof
• Sheets older than 10-15 years, even if they look fine from a distance
• Water stains or damp patches on the ceiling below
• Rusted or missing fasteners holding the sheets in place

If any of these apply to your roof, a solar installer should not be climbing onto it at all or installing a mounting structure on it.

Is It Safe to Install Solar Panels on a Roof in General?

Installing solar panels on a roof depends entirely on the roof, not on the solar panels themselves. What matters is whether the surface under them can carry the load safely for ~25 years.

• RCC roofs: They’re strong, stable, and the most common choice for solar in India
• Metal roofs: These are also safe when the sheet gauge and mounting are matched correctly
• Asbestos roofs: Comparatively weak, brittle, and not recommended for solar installation

So when people ask if it is safe to install solar panels on roof structures in general, the real question to ask is what the roof is made of, not whether solar itself is safe.

How to Install Solar Panels on an Asbestos Roof (And Why We Say Don’t)

If you search for how to install solar panels on an asbestos roof, you will find installers online who claim safe, non-penetrative mounts that avoid drilling into the sheet. In theory, this reduces the risk of cracking the roof.

In practice, this only works if the asbestos sheet is fairly new, undamaged, and properly supported. Most asbestos roofs in Indian homes and commercial buildings are old, already weathered, and were never designed to carry 25 years of extra weight and foot traffic.

Even with careful mounting, you are still relying on a material that is brittle, short-lived, and classified as a health hazard. At SolarSquare, we choose not to install on asbestos roofs, even when a workaround is technically possible, because the long-term risk to your roof and your solar investment is simply too high.

What to Do If You Still Want to Go Solar

The straightforward solution is to remove the asbestos sheets and replace them with a metal roof before installing solar. Metal sheets are the more affordable of the two solid roofing options, which is why they are so popular.

Metal sheets come in different thicknesses. The thicker sheets cost more but suit spaces with heavy heat or electrical work, such as garages and factory sheds. Thicker sheets also allow a higher overlap, which reduces the chance of water seeping through gaps.

Galvalume steel sheets are a popular, more affordable option that many homeowners choose when replacing an old asbestos roof.

Is Replacing an Asbestos Roof with a Metal Roof Worth the Investment?

Yes, it is worth it. You still get every benefit of going solar: lower electricity bills, free solar power for 25 years, and a much smaller carbon footprint.

Replacing the roof does raise your upfront cost. But it usually adds only 6 to 8 months to your payback period compared to installing straight on an existing roof.

A good installer will help you decide the right solar system size for your power needs and the right metal sheet thickness to safely carry that system.

Not sure if your roof is ready for solar? Whether you have an asbestos shed, a metal roof, or an RCC terrace, SolarSquare can inspect your rooftop, tell you honestly if it needs any changes, and design a safe, high-efficiency solar system for your home that lasts 25 years. Book a free solar consultation and get a clear, no-pressure plan for your home or business.

Conclusion

Installing solar panels on an asbestos roof is a major safety risk for everyone involved: you, the installation team, and future maintenance workers.

Nothing about switching to solar is worth risking someone’s safety. If your roof is made of asbestos sheets, replacing it with a metal roof before installing solar is the responsible, long-term choice.

Frequently Asked Questions

Is it safe to install solar panels on an asbestos roof?

No, you should avoid installing solar panels on an asbestos roof. Asbestos sheets cannot reliably carry the static and dynamic load of a solar system for ~25 years. Also, they pose a health risk when disturbed.

Can solar panels be installed on an asbestos roof at all?

Some installers use non-penetrative mounts to do it, but this only reduces the risk of breakage. The roof’s brittleness, short life, and health hazard remain, so you must avoid it.

What is the safest way to do solar panel installation on an asbestos roof?

The safest approach is not to install directly on it. Replace the asbestos sheets with a metal roof first, then install the solar system on the new, stronger surface.

How long does a solar system last compared to an asbestos roof?

A well-installed solar system runs efficiently for 25 years or more. An asbestos roof typically lasts 10-15 years, and even less once it carries extra load, which makes the mismatch a real problem.

Can I install solar on part of my roof and leave the asbestos section untouched?

Yes, if your building has a mix of roof types, you can install solar only on the RCC or metal sections and leave the asbestos part alone. This is often a practical middle path when a full roof replacement is not possible right away.