Roof cleaning in Auderghem
We handle roof cleaning and demossing in Auderghem and the surrounding communes. It's the kind of work owners often forget. Until the day the moss has worked its way between the tiles and the damage begins. A proper clean done in time can save you a complete renovation a few years down the line.
What does roof cleaning involve
Roof cleaning covers several things. First the demossing: removing the moss, lichens and algae colonising the surface of the tiles and slates, especially on north-facing or shaded slopes. Then, depending on the state of your roof, we can apply a preventive anti-moss treatment and, if the covering allows it, a water-repellent to seal porous materials.
With us, everything starts with an assessment. If your roof needs something else (a few tiles to reposition, a valley to check, a damaged flashing), we tell you while we're up there. No need to book a second visit.
When should you clean your roof
Here are the concrete signs that it's time to act:
Green or black patches are visible from the street. Moss forms thick cushions that lift the tiles. Your gutters keep blocking with plant debris. After rain, water sits on certain areas instead of draining normally.
An important point: moss alone doesn't destroy a roof overnight. If your roof is recent and you see a few green patches, it isn't necessarily urgent. But if the covering is more than 20 years old and moss has settled everywhere, a clean followed by a treatment can add several years to your roof's life.
24h call-out available if a leak appears during or after a frost spell: frost under mossy tiles accelerates their degradation.
Why it happens
The roofs of Auderghem are often exposed to moisture, especially the houses close to the Sonian Forest. The shade of the trees, the frequent rain of the Brussels region and the winter temperature swings create ideal conditions for moss and lichens to settle.
Natural slates and terracotta tiles (very common on the villas and townhouses of Auderghem) are porous surfaces. They hold moisture more easily than zinc or EPDM. That's completely normal, and it doesn't mean your roof is bad. It means it needs regular maintenance.
What makes the price vary
The price of a roof clean depends on several things. The total surface to treat is the first factor: a small terraced house doesn't have the same volume as a villa with several slopes. Accessibility counts too: a flat or gently sloped roof is quicker to treat than a very steep one requiring a harness and scaffolding.
The state of the moss plays a role. Light colonisation is treated faster than a thick layer built up over years. If the roof hasn't been cleaned in 15 years, expect more time than for regular maintenance.
Finally, if we spot problems during the clean (a broken tile, a loose zinc junction), we offer to fix them within the same intervention rather than making two separate visits. It costs less and it's more practical for you.
Repair or clean: what you really need to know
A roof clean doesn't fix everything. If the tiles are porous or crumbly, or the structure shows signs of moisture, a simple demossing won't be enough. In that case we tell you clearly rather than charging you for a treatment that won't have a lasting effect.
We regularly work on roofs in Auderghem and the neighbouring communes (Watermael-Boitsfort, Woluwe-Saint-Pierre, Ixelles, Etterbeek), and we often see owners who had a roof cleaned when it actually needed a partial redo. It's not their fault, but you'd rather have that information before spending the money.
If your roof needs a more complete renovation, we can take care of that too.
See also: Roof renovation · Roof repair · Gutters & cornices
Frequently asked questions
Is roof cleaning really necessary, or is it just cosmetic?
Both at once. A clean roof protects better. Moss holds water, which accelerates the degradation of the materials, especially under frost. But if your roof is in good condition and there's little moss, a clean every 5 to 7 years is enough. We won't tell you it's urgent if it isn't.
What's the difference between cleaning, demossing and a water-repellent treatment?
Cleaning is removing surface deposits. Demossing specifically treats the moss and lichens. The water-repellent treatment comes afterwards to seal porous materials and slow the moss's return. They're three complementary steps, but we don't necessarily do all three at every intervention.
Does the roof need cleaning before applying a water-repellent?
Yes, always. Applying a water-repellent to a dirty or mossy roof is pointless: the product doesn't bond properly. Cleaning comes first.
How long does it take to clean a roof in Auderghem?
For an ordinary house, between half a day and a full day depending on the state and the surface. You get a clear estimate before we start.
Is your work guaranteed?
Yes. We work with a 10-year workmanship guarantee. For materials and treatments, the duration depends on the product applied: we explain everything before starting.