DIYbanter - View Single Post - Blocked Drain

On 15 Jan 2006 16:40:39 GMT, (Andrew
Gabriel) wrote:

A tree root is not the slightest
bit interested in a sewer pipe, unless it's already broken.

A thick root beneath a sewer may lift the pipe and break it, just like a
tarmac drive.

Many old sewer joints also leak slightly, even if this is far too little
to count as "a leak". In dryish ground this can be enough of a source of
moisture to be attractive to small roots.