Today’s blog takes us to Annacis Island situated under the Alex Fraser bridge between Delta, Richmond and New Westminster BC. The worst case scenario leak occurs on a flat roof with external drains. External drains mean that the drains are located outside of the building’s perimeter. So the roof sags, in the middle, over time and the drains remain a high spot on the outside edge of the roof area. Complicate that with an old tar and gravel roof and you have a leak that can fill a bucket faster then you can empty it. Good thing this leak was just in a metal shop and not over some computer warehouse or something like that. A lot of water was getting in. We shoveled. We swept. We blew water. We found the problem and dropped some clay on it. Now we just need the roof to dry so we can upgrade the temp patches to a more permanent torch on status.