A conservatory should be one of the brightest, most enjoyable rooms in your home. But over time, a dirty roof turns it into something quite different — a dim, uninviting space that feels cold even on sunny days. If your conservatory isn't the room it used to be, the roof is almost certainly the reason.
Why Do Conservatory Roofs Get So Dirty?
Conservatory roofs sit at a low pitch compared to your main roof, which means water pools more easily and debris accumulates faster. The main culprits are:
- Algae and green growth — Somerset's damp, mild climate is ideal for algae. It starts as a faint green tinge and gradually thickens into a dense layer that blocks significant light. North-facing panels and shaded areas are worst affected.
- Moss — Moss takes hold in the gaps between panels, around frame joints, and anywhere moisture lingers. Left unchecked, it can work its way under seals and cause leaks.
- Bird droppings — Birds love to perch on conservatory ridges and finials. Their droppings are acidic and, if left, can etch into both glass and polycarbonate surfaces permanently.
- Tree sap and fallen leaves — Overhanging trees deposit sticky sap that bonds with dust and pollen, creating a stubborn layer that rain won't shift. Fallen leaves block drainage channels and cause water to pool.
- General atmospheric grime — Exhaust fumes, dust, and airborne pollution settle gradually and build up over months into a dull, opaque film.
Glass vs Polycarbonate: Different Materials, Different Care
The two most common conservatory roof materials require quite different approaches:
Glass Roofs
Glass is more durable and scratch-resistant, but it's heavier and shows water spots more readily. It can be cleaned effectively with purified water and appropriate tools. Glass roofs generally stay cleaner for longer because their smoother surface gives algae and moss less to grip onto.
Polycarbonate Roofs
Polycarbonate panels are lighter and cheaper, but they scratch easily and have a textured surface that traps dirt. Over time, they yellow and become opaque — a process accelerated by UV exposure and embedded grime. Crucially, polycarbonate must never be cleaned with a pressure washer. The high-pressure water can crack the panels, force water into the internal fluting (the hollow channels inside the panel), and cause irreversible clouding. Once water gets inside polycarbonate fluting, it can't be removed and the panel will need replacing.
Professional cleaning of polycarbonate uses low-pressure purified water and soft brushes only — no pressure washers, no harsh chemicals, no abrasives.
What's Included in a Professional Conservatory Roof Clean
A thorough conservatory roof clean covers more than just the panels themselves:
- All roof panels — cleaned with purified water and soft brushes to remove algae, moss, bird droppings, and grime
- Frames and glazing bars — the aluminium or uPVC framework between panels collects dirt and algae in every crevice
- Seals and gaskets — cleaned carefully to remove moss and debris that can compromise waterproofing
- Gutters and drainage channels — cleared of leaves, moss, and silt to ensure proper water flow
- Ridge and finial — the top ridge and any decorative finials are cleaned and checked
How Often Should You Clean Your Conservatory Roof?
We recommend at least once a year for most conservatories in Somerset. The best time is spring — clearing the winter's worth of algae and grime just before the warmer months when you'll actually want to use the room. Properties surrounded by trees or in particularly shaded, damp locations may benefit from twice-yearly cleaning.
Regular annual cleaning also lets you spot potential issues early — cracked seals, blocked drainage, or loose panels — before they turn into expensive repairs.
Signs Your Conservatory Roof Needs Cleaning
If you're unsure whether it's time, look for these tell-tale signs:
- Green tinge — Even a faint green haze means algae has taken hold and is blocking light
- Reduced light levels — If the room feels darker than it used to, the roof is the likely cause
- Visible moss or debris — Moss in the joints or leaves sitting on the panels
- Dripping or damp patches — Water finding its way past blocked drainage or compromised seals
- The room feels cold and unwelcoming — A dirty conservatory roof blocks solar heat gain as well as light, making the space feel colder than it should
The Difference a Clean Roof Makes
The transformation after a professional conservatory roof clean is remarkable. Homeowners are often surprised by just how much light was being blocked — the room goes from feeling like an afterthought to being the brightest space in the house. A clean roof lets solar warmth through properly too, meaning the conservatory is actually comfortable to sit in for more of the year.
A dirty conservatory roof can make the whole room feel dark, cold, and neglected. It drags down the feel of your entire home. Cleaning it is one of the most cost-effective ways to transform a room you'd stopped using into one you actually enjoy again.