What aspect of a masonry structure can commonly lead to long-term issues?

Mortar joint durability is a critical aspect of masonry structures that can lead to long-term issues if not properly maintained. The mortar joints between bricks or blocks serve as both a bonding agent and a barrier against moisture intrusion. Over time, exposure to environmental conditions such as freeze-thaw cycles, rain, and temperature fluctuations can cause the mortar to deteriorate. This deterioration can lead to cracks and gaps in the joints, filling them with water and allowing for moisture penetration, which can ultimately compromise the integrity of the entire structure. If the joints fail, it can also lead to structural instability, increased repair costs, and may facilitate the growth of mold or mildew within the walls.

In contrast, while water resistance is important for masonry structures, it is typically the durability of the mortar joints that determines how well the structure can withstand water-related issues over time. Weight distribution is also a key factor in masonry construction; however, it is less about the long-term health of the structure itself. Material availability can influence the construction process but does not directly relate to the long-term issues that arise in established structures. Proper attention to mortar joint durability is essential for ensuring the longevity and stability of masonry constructions.