a neighbours house has a chimney problem, basically block work cracked internally in attic causing stack to become loose. Builders are rebuilding at the moment. They had a look at the job and the clay pot is touching the side wall of the chimney. It is well up from the fire below as its a two storey house. Is this a problem. I thought chimney should be surrounded by sand and cement mix and not touch block work. They are working in a tight space between roof trusses. Any builders out there concerned abut clay pot touching newly built block wall ?