What is the standard depth at which a building sewer should be installed?

The standard depth at which a building sewer should be installed is typically related to local building codes and environmental factors. While various jurisdictions may have specific requirements, the most commonly accepted depth is that a building sewer should be installed to protect it from frost, ground movement, and surface loads.

A depth of 0.65 m (the correct answer) is often recommended as it provides adequate protection while allowing for stability and proper function of the sewer system. This depth helps ensure that the sewer line is below any potential frost line in colder climates, thus preventing freezing and potential ruptures in the pipe.

The other depths mentioned can vary but are generally either too shallow or not consistent with best practices for sanitation and plumbing standards in many areas. For instance, a depth of 1 meter or more would be suitable in some locations to ensure protection from frost, while depths like 0.3 m may leave the sewer vulnerable to freezing and shifting soil conditions. Thus, knowing and adhering to the recommended depth is crucial for the longevity and functionality of building sewer systems.