Which Lime to Use? Part 2 – Plasters & Renders for Older Buildings

Lime Plaster & Render Uses Explained — How to choose the right mix for old buildingsIn this episode of Talking Conservation, Stephen and Rich continue their deep dive into lime applications; this time focusing on internal plasters and external renders for traditional and historic buildings.We discuss the different types of lime used in plaster and render work; including air lime, NHL 2, NHL 3.5, hot lime, and pozzolanic mixes and how to choose the right one based on the substrate, exposure, and performance needs.We cover:Why flexibility and vapour movement matter in internal plaster systemsWhen to avoid overly hard or dense mixes on older wallsHow to approach external render repairs or replacementsWhat to do when cement-based render is already presentModern vs. traditional techniques — and where specialist mixes like insulating plasters might helpThis practical discussion is rooted in conservation knowledge, with decades of experience in what works, and what doesn’t, when applying lime-based systems in heritage settings.Whether you're working on your own older property or advising clients as a professional, this episode will help you make informed choices on plaster and render mixes.👉 Missed Part 1? Watch it here: “Which Lime to Use? Part 1 – Mortars for Building & Pointing Older Buildings”👉 New to the series? Start here:• Ep.1: The Lime Cycle Explained — where lime comes from, how it's made, and how it behaves chemically in use• Ep.2: Lime Mortar Types Explained — covering air lime, hydraulic lime, hot lime and hybrid mixes👉 Subscribe for more on building conservation, restoration, and heritage homes👉 Homeowner? Book a 1-1 consultation at www.expertible.com👉 Professional? Learn more about mentoring or training with Stephen at www.beconservation.com