If you see gray, orange or yellowish spots on your roof in Prévost, they are probably lichens. This fungus-algae symbiosis is the most destructive of the organisms that colonize roofs. Lichens resist simple washing much better than moss — their rhizines physically anchor in the shingle.
Why choose Toit Propre in Prévost?
Pricing in Prévost
Minimum $399 before taxes (GST 5% + QST 9.975%). Adjustments for moss, lichens or difficult access. Deposit by Interac: paiements@aqua-net.ca
Frequently asked questions about Roof Lichen Removal in Prévost
Yes, lichens are the most destructive. Their rhizines extract minerals from your shingles and create microcracks that promote infiltration. In Prévost, orange and gray lichens are the most common.
Sodium hypochlorite (SH) at an adapted concentration is the only effective method. Mechanical scraping damages shingles. Simple washing is ineffective. In Prévost, our protocol includes extended contact time for established lichens.
Slightly, yes. Severe lichen presence results in an adjustment of $0.05 to $0.10/sq.ft depending on the affected area in Prévost. Our online calculator accounts for this factor.