Geowoven textile fabric is it necessary?
I am having a retaining wall built on my property next to my driveway. I was watching them install it today and they are running a perforated corrugated pipe behind the wall, laying a concrete and stone base under the modular block wall, but they did not use a sock on the corrugated pipe or lay any geowoven fabric between the dirt and and stone. The trench between the wall and the dirt is about 12-18inches wide and he is filling it all with large jagged stone. I’m reading some conflicting info about whether the fabric is needed because the trench is large and the wall is not that tall mostly 1-3 ft with a few sections at 4 ft. He laid some weed control fabric under the gravel path that will be next to part of the wall but he also didn’t lay any textile fabric on the piping for the French drain he installed so I’m concerned.
I asked him about it and he said the geotextile fabric is not necessary and he guarantees his work but what’s the verdict. Is he being lazy/cheap? So far he has been pretty easy to work with should I ask him to add the fabric, they are about halfway through building the wall so far.