What makes roof moss & algae treatment in Ajax its own problem
There is a rhythm to roof moss & algae treatment work in Ajax: a quiet summer, a frantic October, and a winter of emergencies that were visible in September.
The swing between a January cold snap and a February thaw can move a masonry assembly enough to open joints that looked sound in the fall.
Many Ajax properties were re-roofed at least once without the flashing being re-detailed, leaving a cosmetic seal doing structural work.
Across Riverside Ajax, Northwest Ajax, Pickering Village, South Ajax and Ajax Waterfront, the housing stock changes street by street, and the correct method changes with it. A century home with a soft-brick stack does not get the same treatment as a 2010 build with a factory-built vent — using one method on both is how systems get damaged.
the practical takeaway is that a roof moss & algae treatment visit should start with an assessment, not a tool. Any crew that begins work before telling you what they found is guessing on your behalf.

