Short Stacked Masonry Chimneys
In order for a masonry chimney to be safe for use, it should be fully lined with terra cotta flue tiles that run continuously from the smoke chamber all the way up to the top of the chimney and penetrate the top of the crown by at least 2”. Each terra cotta flue tile should be mortared tightly together with no gaps, holes or spaces between the flue tiles. Each mortar joint should be completely sealed.
A “Short Stacked Chimney” is a chimney that doesn’t have enough terra cotta flue tiles to fulfill the above requirements.
“Short Stacked” chimneys occur when the mason building the fireplace and chimney doesn’t have enough terra cotta flue tiles to complete the job properly. Rather than making a second trip back to the brick yard in order to procure the need terra cotta flue tiles, the masons sometimes “cheat”, and the homeowner is left to deal with a potentially dangerous situation.
When faced with the fact that he doesn’t have enough flue tiles to complete the job, a mason will sometimes cheat by doing one of two things:
1. Fool the building inspector with spacers: Some unscrupulous masons may fool the building inspector by using some sort of spacers (usually red brick) in order to prop the uppermost one or two flue tiles up from the underside, making it appear from the outside of the chimney that the flue tiles are lining the entire length of the chimney from top to bottom.
This is a dangerous deception because the gap that is consequently created between the flue tiles leaves dangerous voids or gaps through which carbon monoxide, creosote, hot flue gases, and sometimes even open flames can escape and cause a structural fire!
If your chimney has this situation, it must be relined with stainless steel liner in order to render it safe for use.
2. Not penetrate the crown by at least 2 inches: If the mason decides not to use spacers between flue tiles, he may simply decide to not penetrate the crown on top of the chimney by 2” and come up short. Rainwater is one of the most destructive elements a masonry chimney faces, and keeping water out of the chimney is of utmost importance. A flue tile that is even with or below the chimney’s crown will likely funnel water directly down the flue each time it rains.
This rainwater infiltration can erode the mortar joints between the flue tiles and your fireplace’s back brick wall, causing extensive damage. If your chimney’s terra cotta liners are coming up short, A to Z can remedy the situation by removing the chimney’s crown and installing the required last bit of required terra cotta flue tile on top of the chimney.
Overstacking flue tiles makes your chimney system less stable and more dangerous over time. Call on the pros at A to Z to restore your masonry chimney to safety.
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Dear A to Z Chimney
I just wanted to thank you from the bottom of my heart for the great service you have done for me. I am an avid wood burner and love to burn my fires just about every evening. There’s nothing like the simple pleasure of curling up next to a warm and cozy fire during those cold winter nights.
Unfortunately, I had a chimney fire which did extensive damage to my chimney and it had to be re-lined with a new Stainless Steel Liner.
Last year, I hired a different company to come out and sweep my chimney. The sweep from that company tried to use high pressure sales tactics to get me to do the repairs. His poor attitude and high pressure turned me off so badly that I decided not to have them do the work.
This year, I hired your company and Chris Donovan was such a gentleman! He gave me the same bad news, but this time I could see it with my own eyes on the screen as he video scanned my flue. He was also much more knowledgeable and informative and really took the time to help me understand. He did not talk condescendingly, and there was no pressure whatsoever.
Consequently, I did hire your company to come back and complete the needed repairs, and was absolutely delighted!! Not only did Chris come back, but Aaron, the owner came, as well. I was delighted to know that the owner was personally seeing to the work. In the process of repairing my chimney, some other minor problems were detected, and they fixed them at no additional charge!
In addition, when everything was done, they did a spectacular job cleaning up every bit of their mess, and I couldn’t even tell they had been here.
Thanks again for the great service you provide! I will use you again and again, and refer you to my friends.
~ Beverly Bland, Carmichael, CA
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