b'Drainage Full tapered insulation to perimeter scuppers. Photo courtesy of W. Allen Partners. Debris clogging drains. Photo courtesy of W. Allen Partners.Modified bitumen roof drainage improved with asphalt and gravel application. Rooftop cooling towers, like the one pictured, are typically found on top of large buildings and could be the source of a Photo courtesy of W. Allen Partners. 2022 Legionnaires disease outbreak in Orillia, Ont. Photo courtesy of CTV News.16ONTARIO ROOFING NEWSISSUE 4 2023/24 THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ORN'