While the Ohio Installation Standard permits installations in any of 3 ways:
  1. The manufacturer’s installation manual
  2. The State of Ohio Installation Standard (very similar to an installation manual)
  3. By an Ohio Engineer or Architect’s Design
There are also some items which must be included in every installation. One example is that a vapor barrier is required for every installation (4781-6-02.2(D). Some other possible differences are included in this document: Heads Up to Installers: Items in the New Ohio Standard which may be Different.