Why are pieces of clay tile falling into my fireplace?
Pieces of clay tile in your fireplace almost always mean the clay flue liner inside the chimney is cracking and breaking apart. The tiles are coming loose from the inside of the flue and dropping down. Stop using the fireplace until a chimney technician has looked at the liner with a camera.
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One thing changes the picture: what the pieces look like. Curved or flat fragments, reddish or buff and smooth on one side, are liner tile. Crumbly brick, mortar or soft black flakes can mean something different, such as deteriorating masonry or creosote. A technician can tell you which it is.
Why clay tile breaks up
A clay liner is a row of tile sections stacked inside the chimney. Its job is to contain heat and smoke and keep them away from the brick and the framing of the house. Over time the tile goes through many cycles of heating up and cooling down. Each cycle stresses it, and eventually it cracks.
Moisture speeds this up. Water getting in through a damaged crown, missing cap or failed flashing soaks the tile and the mortar joints between sections. Combustion byproducts can also attack the clay and the joints. Once a crack opens, pieces can spall off and fall.
A past chimney fire is another common cause. The heat of a chimney fire can crack tile sharply, sometimes without the homeowner ever knowing it happened. Whatever the cause, a liner that is shedding pieces is no longer doing its job. A damaged liner can let heat and carbon monoxide reach the structure of the house, so the appliance should not be used until the flue is verified.
What you can check yourself
Look at the fragments
From outside the firebox, note their colour, thickness and shape. Take a photo with something beside them for scale, so the technician can see what you saw.
Note when they fall
Pieces that show up after rain point toward water getting in. Pieces that appear after a fire point toward heat stress. Write down what you notice.
Check the damper handle
Make sure the handle moves normally and that the damper is not jammed by debris. Don't reach up into the flue to clear anything.
Look and smell around the fireplace
Check for staining on the wall above or beside the opening, a damp or smoky smell, or a gap between the firebox and the wall.
Check your alarms
Test the carbon monoxide and smoke alarms near the fireplace and on each level. If anyone has a headache or dizziness while the fireplace has been in use, get outside and call 911.
When to call a technician
Call as soon as tile pieces appear. Looking and listening cannot tell you how much of the liner is damaged or whether the cracks run the full height of the flue. Only a camera inspection shows that. Until then, keep the fireplace or stove unused.
One Call Chimney is a referral and scheduling service. One call to (866) 576-7943 arranges a visit from an independent sweep or mason. The estimate is free, the technician inspects the chimney and gives the price before any work starts, and you approve it first. Whether a permit applies to relining varies by city and county, so check with your local building department.
What the technician will do
- Camera inspection firstA camera is run through the flue to show where the tile is cracked, missing or displaced. Ask to see the footage and to have the findings explained in writing.
- Match the liner to the applianceIf relining is needed, the flue and appliance are matched for size, material and termination. A stainless steel liner is sized to the appliance and insulated where required.
- Cast-in-place lining where it suitsIn some chimneys, a cast-in-place lining is the appropriate choice. The technician explains why they recommend one option over the other.
- Cap and crown addressed tooBecause water often causes the damage, the cap and crown are looked at during the same visit, so the new liner is not exposed to the same problem.
Related questions
- Can I keep using the fireplace if only a few pieces fell?
- No. A few pieces can mean a larger area of damage you can't see. Wait until a technician has inspected the flue with a camera and confirmed it is safe to use.
- Does a cracked clay liner always need relining?
- Not always. The camera shows how extensive the damage is, and that decides the repair. If the liner is broken in several places, relining is the usual answer. Ask the technician to show you the footage and explain the reasoning.
- How is the price decided?
- It depends on factors such as how easy the chimney is to reach, its height, what the camera finds, the materials needed, and whether the crown or flashing also needs work. The technician gives the price after inspecting, before any work starts, and the estimate is free.
- Does One Call Chimney do the work?
- No. One Call Chimney arranges the visit with an independent sweep or mason, who does the inspection and the work. You approve the price before they begin.
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One Call Chimney arranges the visit; the technician does the work and gives you the price.