The main reason we choose the stick built method for single family and multi-family residential construction is that with the use of steel roof and wall panels, condensation WILL occur on the backside of the panels if a continuous thermal break (OSB sheathing) is not installed.  This condensation or dripping phenomenon occurs when the cold steel is warmed up in a short amount of time for example when the sun comes up in the morning and hits the cold steel roof.  Due to fact that we do not want your wall and ceiling cavities to hold water and cause rot and mold growth, we have made it our policy to only use this method for residential construction.  Other reasons, include that most local inspectors are not familiar with “post frame” construction and it is not recognized in the UDC manual for inspection approval.  This requires additional engineered documentation on each project that the post frame method performs to the same level as stick built.  This is adds time and extra cost to each project.