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Old 11-19-2010, 05:00 PM   #1
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Chimney exterior problems


I would like to re-side the chimney, but am not quite sure how to start. I don't want to damage the roof or get myself into something I can't handle. I plan to use Hardie board to replace this Masonite junk.

Here are a couple of pictures of it. I stopped the leak a couple of years ago with tar and caulk, but the tar has become brittle and separated between the two surfaces.
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Chimney exterior problems-chimney_leak1.jpg   Chimney exterior problems-chimney_1.jpg  

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Old 11-19-2010, 05:29 PM   #2
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Chimney exterior problems


Use step-flashing when you re-side.

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Old 11-19-2010, 07:32 PM   #3
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Chimney exterior problems


Quote:
Originally Posted by masonitesucks View Post
I would like to re-side the chimney, but am not quite sure how to start. I don't want to damage the roof or get myself into something I can't handle. I plan to use Hardie board to replace this Masonite junk.
If you don't know where to start the you're probably going to [not be so successful with it].

For starters the trim boards going on top of the siding is bass ackwards. Look how water can get right in behind the corner boards.

More subtle but just as bad IMO is that front vertical trim board. It looks nice and clean with the whole width of the board showing, but how does the step flashing run out past the corner without a kerf in that board (which coincidentally NEVER gets cut so the step is always just kind of an abortion at the bottom junction).

It's second nature to me, but that will be a big repair for you to figure out on the fly.
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Old 11-19-2010, 07:59 PM   #4
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Chimney exterior problems


It might be more helpful if I post the steps:

1. Remove existing siding, flashing, and surrounding shingles.
2. Shingle and properly step flash chimney.
3. Install weather barrier to chimney sheathing that laps over roof flashings.
4. Install new corner trim boards that allow flashing to run past corners.
5. Install new fiber cement siding and caulk all gaps.
6. Paint or not.
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