Lime Mortars

Premixed lime mortars, renders & plasters supplied ready to use or in powdered form, including Premixed Putty Mortars and Cornerstone Mortars.

Lime Mortars are convenient to use, coming premixed with a range of sands for specific applications. The Cornerstone range includes regular lime mortars for restoration and conservation work, such as the Drymix and Promix range, but also a range of carbon neutral newbuild mortars and a comprehensive range of performance mortars for specific situations.

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Lime mortar is a versatile material that is used in a wide range of applications. For historic to early 20th-century buildings with solid walls and no cavity, lime mortar is strongly advised to assist with managing moisture within the building fabric. Lime mortar can also be used in new build applications with a cavity. However, these are typically stronger limes with hydraulic properties. We stock the Cornerstone New Build Range, explicitly designed for new build construction.

Lime and cement are both excellent materials; one is not ‘better’ than the other. Rather, they are two binders used in different applications and building methods. Lime mortar is more appropriate for heritage and conservation projects than its cement counterpart and has long played an essential role in repairing and restoring solid-walled buildings.

There is no ‘best’ or ‘one size fits all’ mix for lime mortar. We always advise that each project is unique, and the mix should be application specific. Another option instead of mixing on-site is to use a premixed lime mortar. When choosing a premixed lime mortar, review the features and application guidance, as these materials are often specially designed for performance in particular applications.

Lime mortar can help better manage moisture problems, but to claim it stops damp is an overstatement. Lime mortars allow moisture to move in and out of solid wall construction, helping to reduce moisture build-up within the building fabric by better managing internal condensation and reducing moisture penetration from the external environment. Remember that there are many causes of damp, so while using a lime mortar might be beneficial, determining the cause of the damp and considering the options to correct it is the best first step.

Using a breathable lime mortar supports moisture to travel and escape from the masonry joints instead of the masonry itself, acting as a sacrificial element to help preserve the stone or brickwork. When stone or brick walls are paired with a rigid non-breathable mortar, the wall’s ability to diffuse moisture becomes compromised. Since this moisture can’t escape through the mortar in the joints, it forces its way through the porous stone or brickwork, which can cause masonry degradation or decay.

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