Final answer:
Most masonry chimneys are built with inadequate caps constructed from common materials such as wood, brick, stone, or mud bricks. A more stable construction method is the post and lintel system.
Step-by-step explanation:
Most masonry chimneys are built with an inadequate cap constructed from common materials such as wood, brick, stone, or mud bricks. These materials were stacked and piled to reach the desired height, and a lightweight roof made from wood was added. However, wood is not as durable as stone and rots away over time, leaving the chimney cap inadequate.
A better construction method for large structures like chimneys is the post and lintel system. This system involves using two pillars of stone with a third stone laid across them. It creates a more stable structure compared to the stacked materials method.
When constructing masonry chimneys, it is important to use durable, weather-resistant materials and ensure that the chimney cap is built properly to prevent issues like leaking or inadequate protection.