Lime Mortar

Lime mortars are used as an effective natural building product in the traditional construction of masonry.

Typically consisting of lime and aggregates mixed with water, lime mortar is moisture permeable and flexible lending itself well to a diverse range of applications within the built heritage sector.

There are two main types of lime – hydraulic and non-hydraulic lime. Hydraulic lime is more frequently used, as it has the ability to reach a relatively quick initial set under hydration, which means it can set under water or in extremely moist environments.  Non-hydraulic lime (also known as lime putty) requires carbonation to set, by which in form of mortar, it absorbs carbon dioxide from the air.

London Stone Conservation use natural lime mortars in various applications within the conservation of buildings and structures consisting of stone or brick. We can slake our own lime, enabling us to gauge the exact strength and mixing ratio for a specific application. We have also been working with natural cement, which is based on a similar principle of that of hydraulic lime. Natural cement is made from lime and clay nodules, and – not to be confused with ordinary cement – has similar hydration properties to hydraulic limes.

In addition to the more traditional approaches, we are currently exploring the diverse use of Nano limes for the consolidation of friable and failing masonry, suited to larger scale projects within the listed building sector.

  • Hydraulic and non-hydraulic lime mortars
  • External lime renders
  • Internal lime plasters including traditional lath
  • Plastic repairs
  • Lime washes
  • Shelter coats
  • Lime waters
  • Roman cement mortars and casts
  • Nano lime applications
  • Hot limes
  • Lime slaking
  • Lime mortar analysis
  • Colour matching original mortars
  • Archive of mortars and aggregates