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Lime render is a popular choice for exterior walls due to its durability and aesthetic appeal. However, one question that often arises is whether lime render absorbs water. In this post, we will delve into this topic and provide you with the answers you need.

Firstly, it is important to understand that lime render is a porous material. This means that it has the ability to absorb water, but to what extent depends on various factors such as the type of lime used, the thickness of the render, and the environmental conditions.

Hydraulic lime render, which is made by burning limestone containing clay or silica, is less porous than non-hydraulic lime render. This is because it sets through a chemical reaction with water, resulting in a harder and less permeable material. On the other hand, non-hydraulic lime render, which is made by burning pure limestone, is more porous and can absorb more water.

The thickness of the render also plays a role in its water absorption properties. Thicker renders are generally more resistant to water penetration than thinner ones. This is because the thicker the render, the longer it takes for water to penetrate through to the substrate.

Environmental conditions such as rainfall, humidity, and wind can also affect the water absorption properties of lime render. In areas with high rainfall or humidity, lime render is more likely to absorb water. However, in areas with low rainfall or humidity, the risk of water absorption is lower.

In conclusion, lime render does have the ability to absorb water, but to what extent depends on various factors. It is important to choose the right type of lime render and ensure that it is applied at the correct thickness to minimize water absorption. Additionally, regular maintenance and repairs can help to prevent water damage to lime render.

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