The most common reason for tuck pointing is to prevent water penetration through de-bonded, cracked or deteriorated mortar joints. The average mortar joint can last up to 20 years. Brick, on the other hand, can last for over 100 years, resulting in the necessary occasional repair of the mortar joints.
Conditions such as freezing and thawing, wind, and rain can erode mortar joints, and depending on a structure’s exposure to weather and other exterior elements, it may require more or less frequent repairs.