Blocked sewer pipe under new extension
Hi, I have a couple of questions about a friend's new extension:
1: If a foundation for a 1-floor (aprox 12 square meters) extension was incorrectly laid, using only sand and cement would it be possible to correct the problem by later digging down (after the extension has been built) and laying concrete and iron mesh reinforcement in overlapping sections?
2. Is it normal to lay the foundation on top of an existing sewer pipe? In this particular house there is a blockage in the sewer which is almost certainly under the extension. Thank you.