My chimney is a masonry chimney made of good quality white bricks
thoughout. At the top is a cement cap, maybe 6 inches think,where its
rounded over into the flue rain guards. That cement top is cracked on
one side, with a gap of maybe 1-2mm for about 1 foot. I was considering
just filling it with either silicone or regular caulking. And tips?
Metal strap required? Ignore it? It doesn't look like its about to
crumble or anything.
Yeah ok. Chimney guys told me to use something today that I don't
remember what it was. I said silicone and they frowned at that, but
that's probably still what I'll use.
(ps that part is called the crown, as I found out today!)
I'd be inclined to use polyurethane caulk...it sticks better to mortar
and the good stuff is rated for 50 years. I used it to caulk the
joint between some stone stair treads and the brick risers. After a
couple of days I tried to remove a little section to redo it neater
and I could *not* get it out; it just would not separate from either
the stone or the brick, no matter how I pulled it or pried it. The
stuff I bought was colored to match concrete (not that it really
matters on a chimmeny cap).
They've started carrying it at the big box stores round here (OH).
I had my chimney crowns fixed a number of years ago.
The mason used a cement or mortar mix to fill the cracks and top off the
existing mortar. He alsoput in a fiberglass fibers additive to strengthen it
against cracking. I would also use a latex additive to your mix.
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