On Sunday, 4 November 2018 15:09:21 UTC, George Miles wrote:

Making and Lining a 6 foot deep manhole pit:

There are tree roots in the main drain from the house,
the drain engineer suggested inserting a new access point
to clear the roots, and maybe insert a plastic liner.

I guess the hole needs to be about 6 feet deep,
and have a possible loan of a digger and driver.

it will be the depth of the pipe. Around 2' is more common.

But how big to make the hole,

the size of a manhole cover set. Note that not all are suitable for cars or trucks.

and how to line it?

either nothing or with cement/sand render

Blocks or concrete how thick?

single leaf of stretcher bond brickwork, so 4"

or newfangled plastic ?

george

You can dig under the pipe, pour concrete in & smooth the bottom to give it a slope each side of the pipe. Once cured, break the pipe. Yes, there are other ways.


NT