Through slab
It is best to avoid running plumbing pipes through the slab. However, this may occur when the pipe discharge level is critical and there is no other means to maintain sufficient height.
Section showing pipe laid through slab
Hot water heating pipes may be embedded in the slab. However, the slab thickness must be increased by 25 mm and the mesh increased to the next size up.
Electrical conduit and waste pipe in a concrete slab
Note: Electric heating cables may be embedded in the slab without any increase in thickness or reinforcement.