What is the maximum allowed slope for the top surface of a footing?

Footings are crucial structural components that help distribute the load of a building evenly to prevent settling and provide stability. The maximum allowed slope for the top surface of a footing is designated as none or zero slope. This is essential because any slope could potentially lead to uneven load distribution, causing structural issues over time.

Having no slope ensures that the weight of the structure is evenly transferred to the ground beneath. This uniformity helps maintain the integrity of the footing and the overall building. When footings are constructed with a level top surface, it allows for better placement of walls, ensuring they are vertically aligned and stable.

In this context, the other options suggest slopes that are not permissible. A slope of 1:12, 2:12, or 3:12 could lead to complications in load transfer, potentially resulting in structural failure. Therefore, maintaining a flat surface on the footing is critical for safety and structural integrity in construction practices.