Home buying is a nerve racking experience. Thrills and surprises await you around every corner. One big one is the home inspection. On something as big as a house there are always items that crop up. You have to decide if they are deal breakers, or if you can take the risk of them being worse than the inspection indicated.
One thing that came up on ours was that the chase cover on the chimney was rusted. It was a surface rust, no emergency, but something to not ignore. A winter break gave me the time, and cooler weather, to get up there and do something about it while not dying of heat stroke. Close inspection revealed that it wasn’t bad and some cleanup plus paint would add many more years of life.
The big square chimney cover bridges the gap between the chimney pipe (might not be the right term) and the wooden structure sicking out of the house. My plan was to take it off, bring it to ground level and do all the paint work. The trick was I couldn’t figure out how to get that top little set of square covers off. I tried rotating the assembly but was worried something in the wall would come apart. 10 minutes of googling while on the roof didn’t give me a good answer.
Chimneys are completely new to me, so I am just feeling my way through all this. The section of roof is pretty tame so I took a grinder up there and did everything on the roof.
Sure enough, the rust wasn’t that deep. I knocked it, and as much other crud off as a I could with a wire wheel and came back with a coarse sander pad. There is still a lot of zinc left, but I had read a self etching primer would bond well with it. A few coats of that, and It was way too hot to keep working.
I came back the next day, sanded the primer and used a full can of high temperature white enamel. Even early in the morning the metal was getting hot and the paint dried too quickly. It isn’t a great paint job, but looks fine from down below. The original plan was to do this all on the ground in the shade. If I had known from the get go I was going to be working on the roof I might have opted to brush on something instead.
I replaced the rusted screw hardware with epoxy coated torx head screws. There is a thin band of metal that covers the gap between the pipe and the newly painted cover. The old one was pretty rusted, but a local fireplace store had new ones, so I replaced it. Not my finest repair overall, but it won’t be rusting through any time soon. When this needs work again I might be calling a fireplace expert of some sort.