Those are exactly the conditions where an exposed-fastener roof fails. Screw-down metal relies on a neoprene washer at every fastener, and every one of those washers is a hinge that works loose through a Muskoka freeze-thaw winter. A mechanically seamed panel is fastened by concealed clips that let the metal expand and contract without dragging on the fastener at all.
We work the full Muskoka Lakes area — Lake Muskoka, Lake Rosseau and Lake Joseph, plus Bracebridge, Gravenhurst, Huntsville, Port Carling, Bala and the Lake of Bays townships. Water access properties are workable; tell us early so we can plan barge logistics and material staging into the quote.