My chimney is glazed . I had it cleaned but they did not remove the glazed part. Is ok to reline with stainless or should it be removed before relining.
chimney glazed
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It has to be removed. A glazed creosote coated chimney is a recipe for disaster with a hot flue liner in it because of the high potential that the heat from the liner will ignite the creosote.
I would get a third opinion
my opinion is that the glaze is a very thin coating that is in every chimney that has been used(do we expect them to look like new construction after cleaning?)
anything thicker than this thin hard coating should be gone with cleaning.
my opinion is that the glaze is a very thin coating that is in every chimney that has been used(do we expect them to look like new construction after cleaning?)
anything thicker than this thin hard coating should be gone with cleaning.
![[Hearth.com] chimney glazed](/talk/data/attachments/17/17875-e74ea392970fd2b3792d34ef5e4422ec.jpg?hash=DCNmJaIY3p)
Are you saying that the instructions for liners is to completely remove the glaze. What are you recommendation's. I've talk to 4 different chimney sweeps and they all had different methods and tools for striping glaze.
It must be removed before installing the liner. Left in there, it's a just asking for disaster. Pick a sweep and let them take care of it however they choose to do so, it's there problem at that point... as long as they get the job done.
Tom has written it all, so I will just post a link to his web site page on the subject.
(broken link removed to http://www.chimneysweeponline.com/hoglaze.htm)
(broken link removed to http://www.chimneysweeponline.com/hoglaze.htm)
Not to contradict the experts but-
When I brushed my flue for 28 years before the liner was installed ( with the new stove), there was always a hard shiny glaze left.
Never had a hint of a chimney fire.
When I brushed my flue for 28 years before the liner was installed ( with the new stove), there was always a hard shiny glaze left.
Never had a hint of a chimney fire.
My confusion is , why shouldn't the hard glaze inside a chimney not be a hazard but when it's separated from the exhaust by a liner it is?
gerry100 said:
Because the heat from the liner can ignite the creosote. Which is, at that point, confined by the top plate. Therefore, the blast has nowhere to go but down into the living space. I don't know where to find it but a lady that owns a stove dealership was for a while a member of the forum and related an instance of a lined chimney lighting off with glaze in it and blowing the bricks apart.
Do what you are/wanna do. Just don't expect the liner manufacturer, the National Fire Protection Association, your local building inspector, your insurance company, your fire department or any reputable chimney professional to bless it.
As to "why shouldn't the hard glaze inside a chimney not be a hazard", it is a hazard. I don't know any sane chimney sweep that would say it isn't. That picture of a glazed flue in my post above is MY own flue. And I have had chimney fires in that flue. They are not entertaining.
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