Solar Panels on Asbestos Cement Roof Roofs — UK Installation Guide
Everything you need to know about installing solar PV on a asbestos cement roof factory roof: fixing method, dead load, structural requirements, warranty implications, and pricing.
Quick reference
- Fixing method: NOT compatible with retrofit PV
- Added dead load: n/a
- Structural survey required: asbestos refurbishment plan required first
- Compatibility: pre-1999 industrial buildings (asbestos use was restricted in 1999)
- Pros: often best opportunity to refurbish to a modern membrane and then install PV in one phase
- Cons: asbestos cannot be retrofitted with rooftop PV. Refurbishment to a modern profiled metal or membrane roof is required first. Cost: £40–£80/sqm depending on system.
Why solar PV cannot be retrofitted onto asbestos cement
Asbestos cement was widely used in UK industrial roofing from the 1950s through the 1990s, with the import and supply of all asbestos products banned in 1999. Pre-1999 industrial buildings frequently retain asbestos cement roofing, particularly in older industrial estates across the Midlands, North West, and Yorkshire.
Asbestos cement is a brittle, low-strength material that deteriorates with age. It cannot safely take the dead load of a solar PV system (8–20 kg/sqm depending on mounting type), nor the localised stress at fixing points. Drilling penetrations into asbestos creates uncontrolled friable asbestos fibre release — a serious health hazard regulated under the Control of Asbestos Regulations 2012.
The only viable route for solar PV on a building with an asbestos cement roof is full roof refurbishment to a modern roofing system (typically profiled steel sheet or single-ply membrane) before any PV installation. This is a notifiable HSE-regulated project, requiring a licensed asbestos contractor and a Plan of Work.
How asbestos roof refurb + solar combined projects work
The good news: combining asbestos refurbishment with solar PV install in a single contract often delivers better economics than either project alone. The PV business case can frequently unlock board approval for a roof refurbishment that has been deferred for years.
Typical combined project structure:
- Phase 1 — Asbestos survey and removal plan by HSE-licensed contractor (typically 4–6 weeks lead time, £2–£5/sqm survey + £15–£30/sqm removal)
- Phase 2 — New roof installation typically profiled metal sheet, sometimes standing seam (£40–£80/sqm fully installed)
- Phase 3 — Solar PV install on the new roof (£700–£900 per kWp)
The whole programme typically runs 16–24 weeks. Capital allowances (AIA + 50% FYA) can be claimed on both the new roof and the PV system.
Asbestos Cement Roof solar — FAQs
Will solar PV void my asbestos cement roof roof warranty?
No, when installed by an MCS-certified contractor using systems that carry roofing-manufacturer acceptance (Kingspan, Tata Steel, Euroclad, SIG). We secure manufacturer sign-off in writing before work starts.
How much extra weight does solar PV add to my asbestos cement roof roof?
For this roof type: n/a. Most post-2000 UK industrial roofs can take 20–30 kg/sqm of additional dead load with no structural intervention. Older roofs may need engineer sign-off — covered in our roof weight load guide.
Can I install solar PV myself on a asbestos cement roof roof?
Above 17 kW per phase, no — G99 grid connection requires an MCS-certified commercial installer. Below that, technically yes but you lose warranty acceptance from major panel and roofing manufacturers, plus face DNO acceptance issues.
How long do solar panels on a asbestos cement roof roof last?
25–30 year manufacturer performance warranty (typically 84–87% output guarantee at year 25). Real-world life 30–40 years with one inverter replacement at year 12–15. Roof and PV warranty timelines align well on most modern UK industrial buildings.
Quote my asbestos cement roof factory solar install
Free desk-based feasibility from your roof drawings and meter data within 7 working days. We’ll confirm structural compatibility before any quote.
Get a Free Quote