R904.2

Section R904.2 is titled 'Compatibility of materials' and covers the requirements for roof assembly material compatibility. A requirement for roof assembly materials and the building materials to be compatible is established. The purpose of this section is to protect the structure from weather and prevent premature degradation of roof assemblies and other building elements.

The model shows a partial roof assembly using a steel roof covering panel and a copper flashing at a wall intersection. Are the steel roof covering panel and copper flashing compatible? Is galvanic corrosion a concern?