The E-Vent system includes a variety of defining moulding profiles and mitered corners, as well as finishing details, including this joining block. It is precision molded in urethane, a rigid, high-density foam material that performs exceptionally well in exterior applications. Urethane trim components are non-porous and they do not permit the moisture absorption that can lead to cracking, peeling, mildew and decay. The joining block is also pre-primed and immediately ready for finishing. This joining block is designed for use with the Crown Dentil E-Vent moulding profile (EV404). The E-Vent system offers a combination of concealed roof ventilation and incomparable styling.