When should Hydraulic Lime Mortar be used?

Hydraulic lime mortar can be used for many applications. However, it is critical that the decision is decided in the early stages of the design and planning process. This will help all design and construction make the necessary adjustments to the work being carried out.

New Build

Hydraulic lime mortars can be used in every aspect of new build construction and has additional structural benefits over modern cements. Lime mortar has gained a wider acceptance in the construction of masonry walls.


Generally, when refurbishment is undertaken it is usually considered as conservation, e.g. the repair and matching of mortars to the original joints of the building. They can also be used for construction of the extension or rebuilding of structures as a part of the refurbishment.


Hydraulic lime mortar is commonly used in construction but can be used in conservation and the restoration of historic buildings. When using lime mortar for this, it is important to establish the composition of the original mortar. With regards to the binder and the aggregate previously used and to match the new mortar as closely as possible, so that there is no evidence that the original mortar has been detrimental to the masonry.


Hydraulic limes are not only used for construction of masonry walls, for example in the construction of walls using compacted hempcrete, limecrete floor slabs and external render and internal plastering.

Speed of Construction

There is a common misconception that the build rate when using lime mortar is slow compared to using cement mortars. Limetec hydraulic lime mortar can achieve a build rate of 1.5 metre lift per day which is comparable to working with cement mortars.

Gain of Strength

The compressive strength develops more slowly in lime mortars than in cement mortars. As a result, the compressive strengths of lime-based mortars are generally quoted at 91 days rather than 28 days.

Cold Weather Working

All masonry walls are susceptible to frost damage to whatever type of mortar used. This usually occurs after construction. Our web page Winter working conditions provide guidance on working in winter conditions. The development of the strength and durability of lime-based mortars is highly dependent on temperature, with little

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