High all
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.
Thanks!
Dean