The honest summary of ice dam risk in Scugog is that the work is simple and the diagnosis is not.
Air-sealing and window upgrades have made Scugog homes far tighter than they were designed to be, and a tight house starves a natural-draft appliance of the make-up air it needs.
Infill and renovation work in Scugog frequently reroutes venting without re-sizing it, and undersized or over-long runs are the single most common cause of poor draft we see.
Across Caesarea, Nestleton, Port Perry, Blackstock and Greenbank, 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 ice dam 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.