Professor of Biogeomorphology and Heritage Conservation University of Oxford
This 2-day course has been approved for 8.0 hours HSW.
Lime is rooted in ancient building practices worldwide and has been part of the conservation toolkit since the 1970s “lime revival.” An understanding of this versatile and durable material is essential for practitioners seeking compatible like-for-like repairs in historic structures. This year’s symposium is an exceptional opportunity to examine the physical properties of lime and related materials and their contribution to moisture management and overall building resilience, both historically and in the context of climate change. Two intensive half-days of presentations, demonstrations and virtual site tours with leading researchers, conservators and craftspeople will explore the history and evolving science of lime use, current conservation practices, the rediscovery of craft traditions such as hot-mixing, and lime’s role in sustainable heritage conservation. Question periods and panel discussions at the end of each day are opportunities to share experiences, engage in lively discussion, identity conservation resources, and tap into international expertise at this year’s virtual event.
Thursday, October 1, 2020. All times are Mountain Time (GMT-7) 1000-1010: Welcome and introduction. Alick Leslie (Getty Conservation Institute)
1010-1045: Lime fundamentals. Keith Blades (Willowbank School). An introduction to lime as a material, its geological origins, the lime cycle, lime production, various forms of lime, historic and modern lime and cement, mortar types and additives and their effects on strength, bond and durability.
1045-1115: Lime and cement in Alberta. Rob Alexander (Historian and journalist, Calgary, Alberta). A history of lime and cement production in the Bow Valley with a discussion of the geological setting and the Canadian Pacific Railway in the emergence of large-scale manufacturing today.
1115-1145: Lime mortar demonstration. Shawn Thibault (Ravenstone Masonry and Conservation Inc). Methods and practical tips for preparing, using and storing lime mortars, including safe handling, mortar workability, and considerations for cold climates.
1200-1230: Rediscovering hot-mixed lime. Nigel Copsey (Earth, Stone and Lime Company). Experiences with chronically damp buildings and research into traditional materials and craft practices in the UK, Europe and North America.
1230-1300: How lime works. David Wiggins (Curtins). The role of capillarity and other properties of lime mortars and harlings in moisture management in historic structures.
1300-1330: Compatibility. Nigel Shrive (University of Calgary). Strength, resilience, moisture management and compressive strength: compatibility and performance of lime-based materials in historic structures.
1330-1400: What do I do? Nigel Shrive (University of Calgary). Case studies and guidance for practitioners, from building assessment and the selection of materials to the challenges of specifying traditional materials in the context of modern construction standards.
1400-1500: Q&A / panel discussion and day wrap-up
Describe the preparation and use of lime and other binders in mortars and renders in historic construction.
Explain how the physical properties of building lime such as compressive strength, bond, porosity and capillarity contribute to durability in traditional buildings.
Propose applications for lime in conservation where critical considerations include repair compatibility and authenticity, durability, and resilience in the face of climate change.
Summarize major areas of current inquiry and debate around building lime use in conservation based on international research and case study presentations.