Guides and advice for maintaining your roof

The questions we are asked most often, with checked answers: first the short answer, then the detail and the sources. Every guide is dated.

Before you decide

When should you remove moss from your roof?
Which season to remove moss, how often, and the telltale signs: answers from the Toiture Wash team, backed by figures.
Moss on the roof: what are the risks?
Moss, lichens, algae: what they do to tiles and slates, what they do not do, and when you need to act.
Does my roof contain asbestos?
Fibre-cement slates, corrugated sheets, date of installation: how to tell if your roof contains asbestos, and why such a roof is never cleaned.
Moss removal on a slate roof
Natural or artificial slates, with or without asbestos: how moss is removed from a slate roof, the precautions to take, and our jobs.

Which moss removal method for your roof?
High pressure, brush, treatment alone, hot water, low pressure, drone: the advantages and limits of each roof moss removal method, by roof type.
Water repellent or paint: which to choose?
Colourless water repellent or roof paint: what each does and which suits your roof. The treatment included in every moss removal is explained too.
Removing roof moss yourself?
Shop-bought moss killers, pressure washer, bleach: what you can do yourself on a roof, and the risks for the roof and for you.
How do you choose a roof moss removal company?
Door-to-door sellers, deposits, rogue traders: the signs of a scam, eight checks before signing, and your rights if the contract is signed at home.

Worked example: a 100 m² roof
Worked example for a 100 m² roof: moss removal, treatment and gutters included, travel costs, VAT, and what pushes the total up.
How to calculate your roof surface area
Ground area, pitch, overhangs: how to calculate your roof's surface area in m², with the pitch coefficient table and three worked examples.
Grants for the roof in 2026: what is left?
Grants for moss removal, insulation or a new roof covering: what is still available in 2026 in each Region, and what has ended.
Roof moss removal: tenant or landlord?
Roof, gutters, roof domes: who pays for the maintenance of a rented home in Brussels, Wallonia and Flanders, according to the official lists of repairs.

Blocked gutter or box gutter: what to do?
Overflow, leaks, blocked downpipe: what to do when a gutter or box gutter overflows, what you can do yourself and when to call a professional.
Your rainwater tank during the moss removal
How to protect your rainwater tank during a roof moss removal and treatment, step by step, and what you can prepare.

Call us on 0484 50 28 32 or message us on WhatsApp: if a question comes up often, we turn it into a guide.