Roof cleaning & moss removal with a water-repellent treatment
We remove moss and lichen without damaging the tile, then apply a water-repellent treatment that stops water sitting and moss coming back.
BeforeAfter
The problem
Why it matters
In Belgium a north-facing slope takes moss within three to five years. Moss holds water, freezes in winter, lifts the tiles and eventually lets damp into the roof timbers.
- Quote
- Priced after a site visit, free of charge and with no obligation.
- Duration
- 1 to 2 days depending on the area and the access.
- Area
- 17 municipalities: Walloon Brabant, Brussels, Flemish Brabant and the province of Namur
How it runs
How we go about it
Every step exists for a reason. The ones that get skipped are exactly the ones that bring the problem back.
Inspection
Condition of the tiles, the ridge tiles, the flashings and the gutters. We photograph everything and show it to you.
Low-pressure cleaning
No 200-bar lance on a porous tile: low pressure, and a rotary brush where it is needed.
Anti-moss treatment
Fungicide applied over the whole surface, contact time respected.
Rinsing and clearing away
Full rinse, gutters cleared, waste taken away.
Water-repellent treatment
A colourless or coloured impregnation that beads water off and slows recolonisation.
Included in the price
What the job covers
- Tarpaulins over the surroundings and the planting
- Low-pressure cleaning matched to the substrate
- Fungicide and algicide treatment
- Clearing the gutters and downpipes
- Water-repellent treatment with a beading effect
- Before / after photos handed over with the invoice
Frequently asked questions
Your questions
Does the cleaning damage the tiles?
Not at low pressure. The risk comes from high-pressure lances held too close: they strip the engobe and leave the tile even more porous. We work at a distance and with the pressure kept in check.
How long does the water-repellent treatment last?
Between 8 and 10 years on a tile in good condition, less on a tile that is already very porous. We tell you beforehand, not afterwards.
Do you need to be there during the job?
No. Access to an outside tap is enough. You get the photos at the end of the day.
Can a natural slate roof be treated?
Yes, but without a film-forming water-repellent treatment: slate has to stay breathable. We match the product to the material.
And if some tiles are broken?
We replace them before the treatment. That is priced separately, per piece, and you approve it before we fit anything.
Do you work in winter?
Cleaning yes, the water-repellent treatment no below 5 °C. We push the second phase back rather than botch it.
By municipality
Roof moss removal near you
Every municipality has its own building stock and constraints. Here is the detail for yours.
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What to know before you decide
Why moss always comes back on Belgian roofs
Maritime climate, north-facing pitches, nearby trees: the three reasons a roof turns green again, and what really slows it…
Read the guideRoof water repellent: what it does, what it does not do
A water-repellent treatment is not waterproofing. What you can expect from an impregnation, how long it really lasts, and the…
Read the guideA quote for roof moss removal?
On-site visit, detailed costing within 48 h, no obligation.