How to Repair a Cracked Chimney Flue Tile

Your chimney’s flue system is used to vent the products of combustion. This fact alone makes it prone to cracks.

Your chimney’s clay flue tiles will crack if the flue system becomes too hot. This would occur if a chimney fire occurred. A chimney fire occurs when the fire in your fireplace is no longer contained strictly in your fireplace.

MVC-009S (2) 2

If the fire is able to move up the chimney into the flue system the extreme heat will most certainly crack your chimney flue tiles.

This vertical cracked flue liner should be repaired using HeatShield or a stainless steel liner.


In some cases if only one flue tile is broken near the top of the chimney and it is accessible enough for replacement, then it can be removed and replaced.scan0024Using a masonry hammer you would remove the ENTIRE flue tile.


  Strike it only a few times to crack it further and remove the pieces by hand for best results.


HeatShield Chimney Liner Repair System
HeatShield Chimney Liner Repair System is another method for repairing chimney flue tiles is to use a HeatShield chimney liner repair system. HeatShield involves winching a foam piece up through the flue system, smoothing heat resistant mortar through all the cracks and open mortar joints.

Stainless steel liners are the most expensive repair for the flue system. These are insulated and dropped into the flue, creating a whole new flue system for  the fireplace to vent through. This method is a surefire way to repair your cracked chimney flue tile. Always consult with a professional about what repair is most appropriate for your chimney flue liner. Follow any manufacturer instructions and follow all fire and building codes in your area. Consulting with a professional before and after you complete the repair will ensure that the work you’ve done is up to code and safe for use


Clay Lamb
Latest posts by Clay Lamb (see all)

5 thoughts on “How to Repair a Cracked Chimney Flue Tile

  1. Recently purchased a new home. Had the chimney inspected and discovered there was a cracked flue tile (2nd from the bottom). It was recommended that our chimney be relined. What is a reasonable price range estimate for a stainless steel flue reline?

  2. There are a variety of factors that play into how much a chimney reline with installation costs, including your area of the country, but on average the cost to have your chimney professionally relined runs anywhere from $2,500 to $5,000.

  3. Are there any products I can fix the cracks in my tile flue myself? Similar to the heat shield product you mention above?

  4. @Eddie Buckner – I have not seen any do it yourself products other than Stainless Steel liners. There are a number of great chimney flue liner repair and sealent alternative products. I would recomend contacting a number of Chimney repair contractors in your area. See what products are being offered, check their references, investigate the repair product, then make your selection.
    Burn Safe and warm
    – Clay

  5. Hi. I had a metal liner installed into my existing clay liner last year. They simply inserted the metal liner into the clay liner. I recently noticed that the top clay liner (part that is sticking out from the chimney) had a piece cracked off on the top. Is this something I need to worry about? I know that the metal liner is doing the venting now and not the clay liner. But afraid that when it rains, water going through the crack into the area between the metal and clay liner. Thanks.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.