On your Fin Drains page, there is an illustation showing the Terram composite feeding directly into a non-perforated pipe. The composite appears to penetrate inside the pipe.
How is this achieved? Does the pipe have to be cut along its length and the composite inserted? Or is there a special pipe for this?
Fin drains such as this example are manufactured and supplied as complete units, that is, the 'fin' is pre-attached to the 'drain'. They ain't cheap, and there are 'workarounds' that can be cheaper for small projects.
