replace or cover leaky cap on prefab chimney?

Old 01-21-05, 12:19 PM
Visiting Guest
Posts: n/a
replace or cover leaky cap on prefab chimney?

I've got a leaky cap on my prefab chimney. I'm talking about the 3' X 6' galvanized flat cap that covers the entire top of the prefab chimney stack. The stack is framing covered by siding. This is the typical cheap, no-brick chimney that you see everywhere nowadays.

I have two quotes from two companies who are proposing very different approaches to the problem. The first proposes to remove and replace the entire cap with a new sheet metal cap, new collars, and new rain collars. The stainless steel version of the job would cost about $700. The second contractor proposes leaving the old galvanized sheet in place and covering it with a rubber material that has a 15 year guarantee. This job also includes rubber gaskets around the stacks and metal rain collars for the stacks. This job is about $350.

I like thinks done right, and I'm planning on staying in the house for a long time. Which way should I go? Cover what I have with this rubber product? Or put a new cover on top of the chimney stack? With the latter approach I still have to check/replace silicone caulking on the stacks every couple years.

Any advice?
Old 02-06-05, 12:01 PM
Join Date: Feb 2005
Location: Colorado
Posts: 255
Upvotes: 0
Received 0 Upvotes on 0 Posts
Unless the company that proposes a complete new cap is going to solder every single seam/joint together , thereby creating a completely waterproof system, forget that one.
Most all steel caps seen these days are flimsy, rivited, caulked affairs posing the same potential problems you're describing.

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: