Christiaan,
your clients, oderers, partners or consultant are requesting a standard? which one?
we are working with any standard requested by our clients ISO, DIN, ELOT or Designhandbook.
the last ten years we did workshopdrawings for projects in europe (6.5 billion budget) - we did the designhandbook and QC the rest with our partners.
i can tell you that you can buy the complet set of ISO 128 and on monday morning you are looking for hard insoulation and ISO 128 says nothing about it.
in ISO 128 you will find the smallest common denominator which is sometimes far away from drafting and design reality.
kalinixta from greece
peter