Excessive roofing granules loss
I had a new Iko Cambridge roof installed in May 2018 and have found granules on my deck and patio lounger since then. I'm located in Edmonton so had a snow covered roof from November to March. I initially thought it was new shingle granule shed but it's been over a year now and it's still all over my deck, especially after it rains. There is also a fair amount of granules in my gutter as well. I don't understand why it's ending up on my deck and not just staying in the gutter. My roof has good ventilation according to my roofer so I'm wondering if I got a defective batch installed. My roofer has been by and we agreed to keep an eye on it and can start a claim if it continues. He hasn't heard from his other customers with the same problem. He also has a good reputation and does roofing for other renovation companies. My question is if this granule amount of loss is acceptable.