Toronto Roofing

This is clearly inappropriate as water will run down the shingles and underneath the flashing.  To prevent the water from entering underneath, the installer put caulking all around the flashing where it meets the shingles as you can see in the photo.  It is only common sense that this is a poor installation as the caulking will eventually crack and water will run underneath the flashing as was evident by the wet stains on the boards upon stripping the flashing and shingles in the area.  Further, the chimney flashing lacks a collar over the tall cone and is simply caulked.

To repair the problem we ordered a new tall cone chimney flashing for a sloped roof with collar and installed it appropriately.  First we installed ice and water shield around the entire chimney area, then installed the chimney flashing and shingles over the flashing.  The water will now run down the shingles onto the flashing and further from the flashing onto the shingles below.  The appropriate overlap of items is installed in a common sense way consistent with the flow of water given gravity.  The collar is installed and prevents an wter hitting the chimney to run down the collar and onto the shingles.  The collar area is then caulked only where there is potential for the collar to leak.  The tall cone is caulked only where the two parts are welded.  This is an appropriate installation of a chimney flashing.  If you are having a chimney like this installed be sure to consult a roofing professional as it is possible that  the person installing the chimney is unaware of proper installation.