Old 11-07-09, 07:08 PM
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I have a chimney with gas logs. The flue is metal and goes up approximately 20ft to the top of the chimney.

My original cap was the type that went around of the edge of the brick and covered the entire top of the chimney. It was made out of steel and rusted and I ultimately had to get rid of it.

My chimney is framed with 2X4's and has brick on the outside. It is approximately 42" by 42" and a 10" metal flue that runs from the bottom of the chimney to the top. The inside of the chimney is empty.

I want to do the following.

Put 2X4"s on the front and the back of the chimney frame 18" from the top of the chimney. Attach 2x4's on top of the boards that I just installed on the left and right side of the metal flue.

I want to then purchase a 13x13 Clay flue that is 24" long. I will sit the Clay flue over top of the metal flue and it will rest on the 2X4's.

Then I want to cut out a 42" x 42" 1/2" plywood and cutout a hole for the Clay Flue. I will attach the plywood to the top of the Chimney Frame and it will be level with the Brick.

I will then concrete the flue with the proper grade so water can run off. I will top with Clay Flue with a Chimney Cap.

Am I going about this the right way? Should I tackle this in a different manner?

My only concern are the 2x4's that I attached to the chimney frame. The 2x4" are almost touching the metal Flue and I wanted to know if this is a problem.

If it is, what should I use to hold up the Clay Flue?

Thanks for you help.
Old 11-08-09, 05:31 PM
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Welcome to the forums! Why not replace the cap with an aluminum cap. No rusting, cheaper and quicker than the project you have outlined.

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