What is a significant issue regarding chimneys made with a cement wash cap?

Chimneys that have a cement wash cap can be subject to deterioration over time, particularly due to environmental factors such as moisture and freeze-thaw cycles. Cement wash caps are not inherently waterproof, and without proper maintenance, they may absorb water. When water enters the cap and freezes, it can expand, leading to cracks and further damage to the cap. This deterioration can compromise the functionality of the chimney, leading to issues such as leaks or structural failures. Regular inspection and maintenance are thus vital to address any signs of wear.

Options highlighting easy installation, durability, or the need for frequent repainting do not accurately reflect the core concern with cement wash caps, which primarily focuses on their long-term reliability and potential for deterioration.