Lime mortar is made up of lime & aggregate and is used in the restoration conservation of old buildings. Lime mortars date back thousands of years, there’s evidence that lime was used to build the pyramids at Giza. Portland cement was introduced in the 19 century and is commonly used in new construction, it is not recommended in masonry restoration works.
There are different types of lime mortar but when we talk traditional lime mortars we are talking about lime being the binder and the only other component to be added is the aggregate and sometimes a reactive silica, when cement or other additives are used it is no longer classed as a traditional lime mortar and then becomes a modern cement mortar.
The different types of limes and mortars.
Older buildings in Melbourne were built using traditional lime mortars and when it comes to restoration work the first rule is ‘like for like’ this means whatever is taken out needs to be put back, traditional mortars need to flex move breathe, and that’s the beauty of the lime.