Edinburgh Stone Repairs & Masonry specialise in the application of various types of lime plaster and lime mortar to historic, heritage and conservation buildings across Edinburgh and Central Scotland. The approach taken by us is both simple and effective. We use traditional methods combined with a knowledge of suitable modern materials. So whether that means matching the lime mortar of the building to replace it ‘like for like’ or ascertaining what the best eco materials available are that can do the building the justice it deserves.
Our lime plastering services include the standard three coat approach of aggregate, lime putty and hair, as well as more modern lime plastering approaches such as hemp plaster (which is a lime putty product) and Glaster (an hydraulic lime and re-cycled glass mix). To protect the exterior of your property we offer a lime rendering service, and lime pointing, both of which can then be finished with a limewash.
Whilst our internal lime plastering products all use lime putty as the binding agent, our external lime render utilises a natural hydraulic lime to offer suitable protection against the elements. Lime render can be finished in a manner of styles, to match the style of the building or the specifications of an architect.
We strive to offer the best lime plastering service available, whether it be sourcing the best quality lime plastering materials, the most suitable products for the buildings requirements, communicating with you throughout the work process, or simply being punctual.
Traditionally stone and brick buildings were built and repointed using lime mortar. The soft and permeable qualities of lime mortar allow for any movement in the structure and ensure moisture in the walls can freely evaporate. As lime mortar is generally softer than stone, occasional repointing is necessary at both low level (due to salt attack) and at higher levels like copings, string and weathering’s (due to water erosion). Lime mortar, especially putty lime mortars can become soft and friable with age but this does not necessarily mean they are not functioning.
Unfortunately, over the last 150 years or more, Portland cement based mortars have commonly been used for repointing joints that were previously filled with lime mortar. Strong cement mortars are invariably too hard for limestone, they can cause damage and being grey are drab and unsightly. Wherever possible they should be removed and replaced with lime mortar which allows the wall to ‘breathe’. The typical cream, buff, pale brown, pink and white lime mortars which reflect the local sand colour, are much more in keeping with the colours and textures of stone and brick.
Questions & Answers
Q: What is better cement or lime?
A: On sandstone and brick it is better to use lime mortar as it allows the masonry to breathe, cement traps moisture in the building and not allowing dampness to escape and causing damage to masonry.
Q: How long does lime pointing last?
A: If done correctly at correct temperatures should last 10-50 years.