UPVC pipe, HDPE pipe construction, useful 360 degrees full package foundation, what does that mean, gravel cap or concrete?.
Fully packed foundations must be concrete, usually at the point of inflection or stress, used to protect pipes. With gravel is not full, but backfill.
360 degrees full package meaning is, tube all buried in the foundation, of course, the foundation is most likely sand or gravel foundation. That is to say, the base layer should be backfilled at least to the same height above the pipe roof
This plastic pipe construction, generally use medium sand as a foundation, pipe installation, the pipe surface to the top of the pipe above the scope of 500mm generally backfill sand
