The RDH Group of companies are recognized as leaders in the building science consulting field in the Pacific North-West. Through their ongoing involvement with building enclosures, they have recognized the advantages of the use of fiberglass in a variety of building applications. As a result, when the opportunity emerged to develop a west coast fiberglass window manufacturing business with pultrusion technology specialists Inline Fiberglass Ltd., the shareholders of RDH decided to support this new initiative. 

Cascadia Windows is not owned by RDH. Rather, the individual shareholders of RDH along with employees of Cascadia are the owners, and the operations are separate from the RDH Group of companies. RDH provides a variety of support services to Cascadia including advice related to technical aspects of window and door products, installation details, quality standards, and shop drawing production. Cascadia has the same commitment to quality and technical excellence that has been the hallmark of RDH.