Unveiling the Fascinating Aspect of Lime Plaster: Its Exceptional Ability for Moisture Absorption

Unveiling the Fascinating Aspect of Lime Plaster: Its Exceptional Ability for Moisture Absorption

Posted on 18-Aug-2023

In the process of constructing or renovating homes, we often focus on aesthetics and structure, overlooking the significance of materials that contribute to a healthy indoor environment. Lime plaster, with its unique ability to absorb moisture, deserves recognition. This blog post explores the benefits of lime plaster and how it can enhance the comfort and sustainability of living spaces.

Lime plasters, like many other lime-based construction materials, showcase remarkable attributes that extend beyond preserving the durability of structures and their wall. They excel in efficiently managing water flow within buildings. One frequently asked question concerning lime mortars is: "Can they absorb water?"

Lime Plasters are known for their notable porosity and permeability, which grants them the impressive capability to adeptly manage moisture movements within structures without retaining water. This distinctive attribute, often referred to as 'breathability,' empowers lime plaster to absorb and release moisture as required by the circumstances. The inclusion of lime plaster in construction plays a vital role in upholding structurally dry surroundings, safeguarding stonework from corrosive salts, and preventing issues related to condensation, especially in areas such as bathrooms and kitchens.


What are the advantages of the moisture-absorbing properties of lime plaster?


Using construction materials that can absorb and then release moisture without causing harm, like lime plaster, offers several significant benefits. The seemingly counterintuitive idea that a substance capable of absorbing water can be advantageous in construction holds for structures of different periods. Let's delve into the numerous advantages of the exceptional water-absorbing ability of lime plasters.


  • They Prevent Water Trapping Within the Building's Structure


Waterproof mortars and plasters are widely used in modern construction techniques. Although these methods are generally successful due to the incorporation of water-resistant approaches in newly built houses, even minor leaks or cracks can escalate into significant issues. In situations where all building components effectively prevent water penetration, any accumulated water may struggle to escape, potentially leading to the risk of trapped water.

Over time, trapped water has the potential to degrade building materials, including sturdy walls. This issue can be exacerbated in colder regions. Continuous cycles of freezing and thawing can lead to the gradual expansion of cracks. Ultimately, this process can lead to the complete deterioration of stone, cement, render, and other highly durable materials. So, how does the use of lime plasters address these challenges?

Due to their water-absorbing nature, lime plasters can act as a sort of wick. They can absorb trapped water from within the wall. Once absorbed, the water will gradually move to the surface of the lime plasters, where it can evaporate naturally without causing harm.


  • Lime Plasters: Balancing Building Humidity


Lime mortars and plasters play a crucial role in regulating humidity, thanks to their inherent water-absorbing capability. These materials come to the aid during periods of elevated humidity, like after showers or cooking in the kitchen, effectively absorbing excess moisture. Conversely, in situations of excessively dry indoor environments, lime plasters aid in the evaporation of water after absorbing it.

This process of absorbing and subsequently evaporating excess water significantly contributes to humidity control within a building. Maintaining a consistent humidity level without excess condensation reduces the growth of mold and minimizes issues related to dampness. Consequently, lime mortars and plasters enhance the comfort of indoor spaces. Moreover, your home's appearance will improve without the presence of dampness!


  • Lime plasters can absorb salt and water, preventing salt damage to the wall


Salts can cause significant damage to walls. The accumulation of salts on the surface of the wall can lead to fractures and deterioration over time. This occurs due to the crystallization of salts within the pores of the wall. The salt attack can result in the buildup of crystallized salt on the stonework's surface over time. This not only degrades the stonework but also diminishes its visual appeal.

Lime plasters play a dual role in safeguarding walls: they absorb both water and salt. As moisture evaporates from the lime plaster's surface, salts crystallize within its composition. This strategic process is particularly advantageous, as it safeguards the integrity of the lime plaster rather than the wall itself, thereby eliminating the need for extensive replacement. In contrast, repointing using fresh lime is a much simpler task compared to the extensive reconstruction of an entire wall.

Moreover, lime plasters possess a unique capability for "self-healing." Water dissolves the salt and 'free lime' within the plaster. When this mixture is applied after water evaporation, the free lime can mend small cracks caused by salt crystallization, effectively engaging in self-repair. This indicates that lime can endure salt-related challenges far longer than walls and surpass cement, which would retain water and salt, accelerating the deterioration of the wall.




Lime plaster serves as a testament to the wisdom of age-old construction methods and their continued significance in today's context. Its capacity to absorb moisture and control indoor humidity levels not only enhances the quality of living spaces but also aligns with sustainability principles and aesthetic values. So, when embarking on a construction or renovation project, take a moment to consider the remarkable role of humble lime plaster in crafting spaces that are not only functional but also visually appealing, both on the inside and outside.

Prioritize the well-being of your home. Opt for Limocoat lime plaster and enjoy its enduring protective qualities. Initiate the journey towards securing your walls by reaching out to us for additional details or to arrange a consultation with our experienced professionals.