If a building code and a standard conflict which one prevail

Solution

Contrary to popular belief“follow the most restrictive requirement.”

There are two general rules:

1. Codes trump standards, and
2. Within a single code, specific trumps general.
These two rules are specifically spelled out in all model code documents, which are typically adopted as the basis of regulating facility design and construction by state and local jurisdictions

As an example of text that specifies how to deal with conflicts, the 2012 International Fire Code states in Section 102.7.1:
“Where conflicts occur between provisions of this code and referenced codes and standards, the provisions of this code shall apply.\"
This text makes it clear that it is the intent of the code that any requirement in code text supersedes whatever may be required by a referenced standard, even if you believe that the referenced standard is “right” and the code is “wrong.”