What is a lime plaster?

It is a type of plaster composed of sand, water and lime, usually non-hydraulic hydrated lime. Lime rendering is perfectly suited for old buildings and is essential to use lime for restoring a building that was originally constructed with lime render. Lime renders are porous and flexible, allowing water to escape the building. Any fine cracks which develop will self heal, as opposite to cement, which cracks and lets water in. There are two types of lime plasters:

  • Natural hydraulic lime
  • Aerial lime  

Why use Parexlanko Lime plasters?

Illustration of hand trowel applying renovation repair mortar to historic heritage building wall

Respect of the old building

  • Low mechanical resistance
  • Flexibility and deformability
  • Water impermeability but porousity and vapour permeability
  • Reversibility of coatings

Qualities of implementation

  • Smoothness
  • Plasticity
  • Attaches to supports

Aesthetics and healthy building

  • Brightness
  • Respect for regional colours
  • Limitations of the appearance of mould, fungi, and micro-organisms
On what support can a lime plaster be applied?

The application of a lime plaster can be done on various supports, such as old masonry of rubble stones, bricks, natural stones including soft stones (chalk, tufa) mounted with low resistance mortar (DTU 26.1) , constructions of rammed earth, adobe, clinker, cob, cob, hemp... For each of our products, you will find all the admissible supports on the technical sheets.  

Posted on: 20/01/2022
Why make lime joints?

The use of a lime mortar is possible to repoint old masonry. It allows adhesion by molding to preserve the integrity of bricks or stones and dosages in accordance with traditional recipes on site.  

Posted on: 20/01/2022
Why use lime plaster?

Lime brings enormous benefits, which is why it is honoured during renovations of old buildings. Lime plasters and mortars are used for:

  • Their respect for old buildings

The microporosity of the lime allows the manufacture of a mortar permeable to water vapour. Lime thus makes it possible to avoid condensation, to reject humidity and thus allows the building to breathe. It also significantly improves interior comfort. 

Moreover, thanks to its bacterid properties, it limits the appearance of moulds, fungi and micro-organisms. 

Lime is also impermeable to runoff water and thus protects the building from external bad weather.

  • Their quality of implementation 

Lime makes it possible to produce creamy products that are easy to apply and work with and have good adhesion to substrates.

  • Their aesthetics 

Due to its luminosity and its characteristics adapted to the specificities of old buildings, lime gives an unequaled decorative cachet to a facade for a lasting restoration faithful to tradition.Finally, associated with other biosourced materials such as hemp, lime has insulating properties, both acoustic and thermal.  

Posted on: 20/01/2022