High calcium quicklime (Calcium Oxide) has many uses, including for making limewash and hot mortar mixes. Building lime has been used as a binder in mortars and plasters for thousands of years.
The introduction of industrial cement in the middle of the 19th century led to the decline in the use of lime, and it virtually disappeared by the mid 20th century. Later evidence emerged that cement mortars, modern plasters, and modern paints can damage the historic building fabric. This led to a revival in the use of lime in recent years, not only for conservation but also for new builds.
Lime used as as finish
Functional and beautiful, limewash is a breathable, weather-resistant finish used on external and internal plaster and masonry surfaces. It is easily maintainable, stable, and long-lasting. It is also ideal for use in cellars and barns, where lime's high pH makes it inhospitable to microbial growth. Oxide pigments can be added for colour.
Care must be taken when adding water to quicklime (slaking). An intense heat reaction occurs that can burn skin, eyes, etc. Wear appropriate protective clothing and mix in a steel bucket as the mixture can get very hot.
Mix to a thin cream consistency. There are many recipes and much advice in historic conservation and natural building literature. Find a recipe and a method for application that suits your project needs.
Our granulated lime is a specifically-sized quicklime in 1/8-inch to 1/4-inch pebbles that is mostly dust-free.