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-   -   Installing a new chimney crown (http://www.diychatroom.com/f19/installing-new-chimney-crown-81038/)

ikessky 09-10-2010 08:26 AM

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.

st_browndc 09-10-2010 09:27 AM

I would use the high temp silicon just to be sure. Doesn't concrete tend to crack in high temps?

ikessky 09-12-2010 09:32 PM

Decided to tackle the job this afternoon. Here is the old crown that I managed to pull off.
http://img.photobucket.com/albums/v6...y/100_2454.jpg

Here is the chimney minus the crown.
http://img.photobucket.com/albums/v6...y/100_2456.jpg

Here is the new crown mortared in place.
http://img.photobucket.com/albums/v6...y/100_2457.jpg

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?

littlecleo 09-12-2010 10:54 PM

Good job!


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