Ruthrauff | Sauer is a full service mechanical contractor serving the Western PA region with in-house Plumbing, HVAC Piping, ... Process Piping, Sheet Metal, Engineering and Design. Our company is built on strong ongoing client relationships primarily from the private sector and an extensive resume of successful projects spanning over several decades. Ruthrauff | Sauer is the headquarters for the Pittsburgh operations of Sauer Holdings. The Pittsburgh office has been one of the largest mechanical contractors in the region since 1943 and is an experienced leader in BIM and prefabrication, with state-of-the-art software and fabrication facilities. read more