Installing a new chimney crown
My apologies if this isn't the right place for this question.
The crown on my chimney is crumbling away to nothing. Last night, I stopped at my local concrete place and picked up a precast crown. My plan is to install the new crown, tuck point the rest of the chimney (only about 3-4 feet sticks above my roof line), and then give the whole thing a good coating or two of a chimney waterproofer. My question regarding the install of the chimney crown is this. Should I lay a bed of mortar on the top run of bricks and set the crown on that or should I use some type of high temp silicon to fasten it to the top run of bricks? I currently have a 6" liner installed inside my clay flue and will also be using a pourable insulation around the liner at the same time I fix the crown.
I would use the high temp silicon just to be sure. Doesn't concrete tend to crack in high temps?
Decided to tackle the job this afternoon. Here is the old crown that I managed to pull off.
Here is the chimney minus the crown.
Here is the new crown mortared in place.
I also filled a couple small cracks in the mortar of the chimney, but it was in pretty good shape, so I didn't push it. Now I'll wait about two weeks and give it a few coats of a chimney water sealant. My perlite should be here in a few days, so I can get my liner insulated also.
The job is far from perfect, but it looks OK from the ground and will keep water out. What more do I really need?
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