You might also desire to consider using breathable underlayment, including the Deck Armor by GAF, in excess of the new roof sheathing to be sure that no dampness gets trapped between the plywood as well as the humidity barrier beneath the shingles. You might want to find trusted roofers in https://rafaeldbpix.spintheblog.com/32125969/getting-my-ottawa-roofing-contractors-to-work