The impact of temperature drop on the chimney can impact the structure and functionality of the chimney. As we have been experiencing in Chicago winters, temperatures have gone from 50 degrees down to 21 degrees during the day, with temperatures falling even further at night. What can you do as a homeowner to watch for, and when to bring in a certified technician from Superior Chimney.
External: Impact of Temperature Drop on the Chimney
Anytime there is a rapid temperature change, it causes the bricks, stones and mortar to expand and contract. These durable materials are still susceptible to thermal shock, especially when it gets wet from ice, rain or melting snow. Because of the drastic change in temperatures, this can cause hairline cracks to begin, and if it goes unnoticed, larger cracks in the masonry will form.
External: Freeze-Thaw Damage
Mortar, bricks and stones are porous materials, meaning that air and water enter the materials. Sometimes, it leaves or dries out, and other times it stays longer. When the temperatures drop below 32 degrees, any of the trapped water freezes and then expands. This can cause small cracks to start, deterioration of the mortar or spalling which is the flaking of the bricks to occur.
External: Ice Build Up on the Chimney Cap or Chimney Crown
When temperatures are 50 degrees and it rains, water accumulates everywhere, including the highest point on your house, the chimney. The chimney cap and chimney crown are always exposed to the harshest elements. When it rains and temperatures drop during the day or night, freezing occurs and can create ice buildup. This can cause the chimney crown to crack or the chimney cap to loosen.
Internal: Chimney Flue Lining
The temperature swing also affects the chimney flue liner. Some chimney flue liners are made from clay. These are especially susceptible to crack forming from the swing in temperatures. But what also happens whether you have a gas or wood burning fireplace is the formation of condensation which can occur when there is fast cooling after the fire in the fireplace is put out or turned off.
Bring out the Sun!
Well, yes, the sunshine melts the ice and snow, but when temperatures go down at night, what remains wet, will refreeze again. The repeated process places stress on the masonry, bricks and stone.
Chimney Inspections Work
A chimney inspection can help with both safety and preserving the structure of the chimney. When a chimney technician conducts an inspection, they will search for cracks in the bricks and mortar, any spalling or deterioration from the thermal shock and freeze thaw cycle. These areas will be marked for repairs if it gets any worse and before it becomes too expensive to repair.
We can’t forget the biggest intruder in the home: water. The chimney technician will also be checking for water leaks from the chimney flashing, the chimney crown, chimney cap or the efflorescence which is the white material that shows up on the chimney or fireplace.
These are just a couple of key areas that a chimney inspection completes. There are numerous other areas, and this can be found on Superior Chimney’s 14-point inspection guide.
Contact us today, and we’ll set you up for a chimney inspection with photo evidence so you have peace of mind with the safety and security of your home.