Firstly, what is lime?
We believe in preserving the past for the future. Explore the unique properties of lime, its natural formation, and why it's the unparalleled choice for the care and conservation of period and listed buildings. Join us to uncover the secrets of this remarkable material.
What makes lime so special for traditional buildings?
Lime is a natural, moisture vapour permeable material which is essential for the conservation and restoration of traditional buildings. Unlike modern cement, lime allows buildings to manage moisture effectively, preventing damp-related issues. This natural capillarity is crucial for the longevity of historic structures, protecting original fabric and accommodating natural movements without cracking.
How and where is lime formed?
Lime originates from limestone, a sedimentary rock composed primarily of calcium carbonate, often formed from the shells and skeletons of marine organisms over millions of years. This limestone is then heated at temperatures exceeding 900degC in rotary kilns to drive out any moisture and CO², leaving "quicklime", which is subsequently 'slaked' with water to create calcium hydroxide, the basis for the various forms of lime used in building. This ancient process, known as the lime cycle, is fundamental to its unique properties.
Who can benefit from understanding lime?
Whether you're a homeowner caring for a listed property, a student embarking on a career in conservation, a skilled tradesperson, or a specifier involved in heritage projects, understanding lime is invaluable. This page is designed to provide foundational knowledge for all, helping you make informed decisions and appreciate the historical significance and practical benefits of using lime in traditional construction.
Your next steps in exploring lime
We hope this introduction has illuminated the importance of lime. The key takeaways are its unparalleled natural capillarity and its crucial role in preserving the integrity of historic buildings. To deepen your understanding, we encourage you to explore the huge number of specific topics on our website, such as Money! - Cement vs lime, Lime Cycle, or Insulating lime plaster? And many others we've written. Should you have any further questions or require further help or advice, please do