Chimney repointing is the process of reinforcing cracked or missing mortar (typically from the roofline up) due to the mortar becoming degraded over time. The most common reason that mortar becomes damaged is due to rainwater penetrating the masonry of the chimney. This water undergoes many freeze thaw cycles throughout the year and expands and contracts, thereby expanding the mortar itself. Due to this expansion mortar will eventually start to crumble, compromising the integrity of the entire chimney. As chimney mortar degrades further the rate of chimney deterioration will often increase as the crumbling mortar is no longer acting as an effective support for the bricks. It is for this reason that degraded or missing mortar must be reinforced with new mortar thereby avoiding complete failure of the structure of the chimney and avoiding an expensive tear down and rebuild.
The Dangers Of A Leaking Chimney
Chimney leaks can be caused by a number of things which often makes them difficult to pinpoint. Not knowing the source of the leak or how to address and solve the problem can be incredibly frustrating and makes repairs impossible. At Chimney cleaning Charlotte our Technicians have years of experience and knowledge to help in troubleshooting. We know where to look first and what to do when we find the cause of the leaks.
The Most Common Causes of Chimney Leaks Are
Deteriorating or Improperly-Sealed Crowns
The crown is the cement layer that sits on top of the chimney stack. If it is deteriorating, too thin, or improperly sealed or cracked it can allow water into the top of the chimney.
Damaged, Deteriorating, or Missing Flashing
Flashing consists of several layers of metal that overlap where the roof meets the chimney. These layers travel up the sides of the chimney a ways, and protect this sensitive area from water invasion. If the flashing is damaged or missing, leaks are inevitable. For more information on flashing, check out our Chimey Flashing page.
Missing or Damaged Chimney Caps
A chimney cap works in conjunction with the crown to keep out water, debris, and animals. When the cap is missing, rusted or damaged, it can leave the chimney vulnerable to leaks and water damage.