Why downspout extensions & drainage works differently in Erin
Erin sits in a freeze-thaw belt, and freeze-thaw is what quietly takes apart masonry, flashing and venting.
Salt spray and road grit carried by winter wind accelerate corrosion on exterior metal components far faster in Peel than the manufacturer's rating assumes.
Wind loading off Lake Ontario pushes driving rain against the south and west faces of a house, which is why water entry so often shows up on one side of a Erin home and nowhere else.
Across Erin Village, Crewson's Corners, Hillsburgh, Ospringe and Cedar Valley, 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 downspout extensions & drainage 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.