A layer of green moss on a roof can almost seem quaint, especially on older or rural homes in Surrey. Some might even think it adds a kind of rustic charm.
But don’t be fooled by appearances. While moss may seem harmless, local roofers know that it can cause serious damage over time if left untreated.
In fact, roof moss is one of the most common causes of premature roof deterioration in the UK, and the damp Surrey climate creates the perfect environment for it to thrive. Here’s why moss is more than just a cosmetic issue, and what you should do about it.
What Is Moss and Why Does It Grow on Roofs?
Moss is a plant that absorbs moisture through its leaves rather than roots. It thrives in shady, damp areas, which makes north-facing roofs and those beneath trees ideal spots for it to grow and spread.
Once it takes hold, moss tends to spread quickly, especially on porous surfaces like clay tiles or older slate.
Problems Caused By Moss Growth On Roofs
While it might start as a small patch, moss can soon cover large areas of your roof, holding in moisture and causing a whole host of problems:
1. Trapped Moisture Can Mean Damaged Tiles
Moss acts like a sponge, soaking up rainwater and holding it against your roof tiles. Over time, this trapped moisture can weaken and crack the tiles – especially during winter when water freezes and expands.
Broken or shifted tiles can expose the underlay and timber structure to the elements. And this can cause rot, leaks and ultimately, very expensive repairs for you.
2. Blocked Gutters and Drainage Issues
As moss grows, pieces can break off and wash into your gutters. This debris builds up quickly, clogging the system and causing water to overflow. When gutters back up, water can seep into the fascia boards, walls and even the foundations of the building. This can create far-reaching structural problems that aren’t easy to spot until the damage is done.
3. Increased Weight on the Roof
When moss becomes dense and waterlogged, it adds a surprising amount of weight to your roof. This can put strain on the roof structure, especially in some of the older properties you’ll find around the Surrey area.
Over time, this extra load can cause the support timbers to weaken or sag. This compromises your roof’s overall integrity.
4. Shortened Roof Lifespan
Roofs are built to last decades, but not if they’re constantly under attack by moss. When left unchecked, moss can shrink the lifespan of your roof.
It causes decay, shifting tiles and damp conditions that allow algae and mould to thrive.
What Should You Do About Moss On The Roof?
Moss removal might seem like a DIY task, but it’s actually best left to the professionals. You may be tempted to get the pressure washer out and blast away the moss, but stop before you do this – it can damage tiles and force water underneath them.
Instead, safe chemical treatments and gentle scraping should be used to remove moss without harming your roof.
It’s also important to identify why the moss developed in the first place. Overhanging trees may need trimming, and you might benefit from roof coatings or copper strips that deter regrowth in the future.
Trust the Local Experts
If you’ve noticed moss growing on your roof, don’t wait until it causes major problems. Regular maintenance and timely cleaning could potentially save you thousands in repair costs down the line.
For reliable advice and safe moss removal, it’s best to turn to experienced roofers for homes across Surrey who understand the specific challenges of the local climate and roofing materials.
They can inspect your roof, recommend tailored treatments and carry out any necessary repairs.
