BLOGS
Why Are My Fascias Going Green (and What to Do About It)?
You probably didn't notice it happening. One day you look up and your white uPVC fascias have turned a patchy shade of green or grey. It's not a great look — and it can make an otherwise well-kept property look neglected. But the good news is it's not permanent damage and it doesn't mean your fascias need replacing.
What's Causing the Green?
That green discolouration is almost always algae. It thrives in damp conditions and loves the slightly textured surface of uPVC. In Kent, where we get plenty of rain and humidity, algae growth on fascias is extremely common — especially on north-facing elevations or sections of roofline that are shaded by trees.
You'll often see it alongside a few other culprits. Mould tends to appear as darker grey or black patches, particularly in spots where moisture sits for long periods. Lichen — the crusty, greenish-white growth — is less common on uPVC but can appear on older or rougher surfaces. And cobwebs, general dirt, and road grime all add to the overall dinginess.
The growth tends to be worse on the parts of your roofline that get the least direct sunlight. That's why you might notice one side of the house looking far worse than the other.
Does It Cause Damage?
Algae and mould on fascias are mostly a cosmetic issue, but they're worth addressing. Over time, biological growth can start to break down the surface of uPVC, making it rougher and more porous — which in turn makes it easier for more growth to take hold. It becomes a cycle where the longer you leave it, the harder it is to clean and the worse it gets.
In extreme cases, long-term neglect can lead to staining that's difficult to fully remove, even with a professional clean. Catching it early — or better yet, cleaning your roofline regularly — avoids this entirely.
Can I Clean It Myself?
You can try, but there are a few problems with DIY fascia cleaning. First, your fascias are up high, which means working from a ladder for an extended period — not the safest job, especially on uneven ground. Second, the wrong cleaning products or too much pressure can scratch or damage uPVC. And third, it's surprisingly hard to get an even finish when you're reaching above your head from a ladder.
We've seen plenty of DIY attempts that leave the fascias looking patchy — cleaner in some spots than others — which almost looks worse than the original dirt.
What's the Best Way to Clean Green Fascias?
Professional cleaning with a water-fed pole system is the safest and most effective method. The pole reaches your roofline from the ground, so there's no ladder risk. Purified water and soft-bristled brushes lift the algae, mould, and grime without scratching the uPVC, and the ultra-pure water dries without leaving streaks or residue.
A professional clean can make discoloured fascias look like new again — and most people are genuinely surprised by how much of a difference it makes. It's a fraction of the cost of replacing your fascias and takes a few hours rather than a few days.
How Do I Stop It Coming Back?
You can't stop it entirely — Kent's climate is just too damp for that. But regular cleaning slows the cycle significantly. We recommend having your fascias and soffits cleaned once or twice a year. An annual clean prevents the build-up from getting out of hand, and your roofline stays looking fresh with minimal effort on your part.
What About the Grey Streaks on My Gutters?
Those dark streaks running down the front of your gutters are caused by the same thing — a mix of algae, oxidisation, and dirty water run-off from the roof. They're cleaned as part of our fascia and soffit cleaning service, so the whole roofline gets treated together.
If you're also noticing debris or plant growth inside your gutters, that's a different issue — check out our gutter cleaning service to get those cleared.
The Bottom Line
Green fascias aren't a sign that anything is seriously wrong — they just need a clean. It's one of the most cost-effective ways to improve the look of your property, and the results are immediate.
If your roofline is looking tired, get in touch for a free quote. We clean fascias, soffits, and gutters across Canterbury, Sturry, Whitstable, Herne Bay, and the wider Kent area.
Alpine Cleaning provides professional fascia and soffit cleaning in Canterbury and across Kent. Contact us for a free quote.
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