I have been on a bit of a rant lately about work being done shoddily or incompetently by professionals. It is my job to look for problems and it can begin to seem that everything built is a piece of junk. This of course is not true.
The other day I came upon a piece of work, a repair that really impressed me. I was checking the roof of a condo and knowing it had a metal chimney I wanted to get a look at the crown.
Metal chimneys have metal crowns that are usually made from galvanized steel or aluminum. The galvanized coating is only a rust inhibitor and eventually the steel will rust. This process is usually helped along because quite often water will puddle on top of the crown.
The puddles, which can cause leaks, are often the result of the crown metal being thin. Creasing the metal adds strength and gives a slight pitch to the crown. Even with creases the metal can pop in the opposite direction (snow is often the cause) and form a divot.
The hole where the chimney comes through the crown is the most problematic area. As I said it's a hole and needs to be sealed. The seal is frequently silicone caulk or roofing tar. Neither of which lasts very long.
Looking at the first photo this crown has all those bad things just discussed happening. There is a puddle because this crown was never creased so there is no pitch to shed the water. It is however made from aluminum consequently rust won't be a concern. But the opening has been gobbed up with roofing tar (a band aid) meaning it has leaked.
Now look at the next crown. It is also made from aluminum, but has been creased (it may be hard to see). Also the metal was actually fairly thick which of course means strength from popping. Lastly the opening was welded! No goop any where to be seen.
All in all a pretty impressive job. It's nice to see good workmanship once in a while. It restores my faith in humanity, at least for a little time.
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