The honest summary of dryer vent risk in Guelph is that the work is simple and the diagnosis is not.
Infill and renovation work in Guelph frequently reroutes venting without re-sizing it, and undersized or over-long runs are the single most common cause of poor draft we see.
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 Guelph home and nowhere else.
Across Riverside Park, Grange Hill, Onward Willow, The Ward and Kortright Hills, 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.
If you live anywhere near the University of Guelph, the practical takeaway is that a dryer vent risk 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.