December 2014 Monthly Meeting

Surprisingly little research has been done into the effectiveness of different drip edge designs. Drip edges are found at window sills, window head flashing, and the edges of roofs and balconies – all critical areas for managing rainwater. By deflecting rain from the exterior surface of a wall, drip edges can reduce moisture-related issues such as freeze thaw of masonry, staining of the cladding, and potential long term erosion of historical materials. In this session, Jonathan Smegal will describe recent research into effective drip edge design. The study he will discuss used a custom-designed apparatus to compare the effectiveness of different drip edge materials, profiles and overhang distances. The results show a significant range in performance. Based on these results, practical guidelines will be suggested for choosing the best drip edge for your project.

Jonathan Smegal’s work for BSCI includes laboratory research, hygrothermal modelling, field monitoring of wall performance, and forensic analysis of building failures. He worked for Balanced Solutions from 2005-2007, joining BSCI in 2007 after finishing his thesis on Drainage in Small Cavities in Wall Systems as part of the Building Engineering Group at the University of Waterloo. Jonathan’s research has included, among other things, cladding deflection tests, drainage balance testing and specialized water uptake and vapour permeance testing. His experience in the lab is complemented by his experience in the field, where he has been involved with forensic work and numerous new construction site audits for residential and commercial construction. As a speaker, Jonathan has addressed a range of audiences at academic conferences, corporate training events, and online. For example, he presented papers at the 2013 Buildings XII Conference and at the 2014 Canadian Building Science and Technology Conference, and has spoken at workshops and other events on diverse topics including cladding attachment, SPF in cathedral ceilings, and rainwater management in wall systems.