Non-Hydraulic Lime Rendering

Why Choose Non-Hydraulic Lime?

Non-hydraulic lime rendering is particularly suited for use on Grade I and II listed buildings, where matching existing materials is essential. This traditional building material is primarily composed of lime, sand, and water.

Unlike hydraulic lime, which hardens through a chemical reaction with water, non-hydraulic lime gains its strength through a natural process called carbonation.  This occurs when lime interacts with atmospheric moisture and carbon dioxide, gradually hardening and becoming more durable over time creating a harden robust finish but also vapour permeable.

Non-Hydraulic Lime Rendering Survey, Mortar Analysis & Documentation

Reputable Rendering conduct comprehensive on-site surveys to assess your project and recommend the most suitable lime types tailored to your specific requirements.

Our commitment to matching new lime with the original mortar’s vapour permeability and strength includes utilising different coloured sands and special dyes for customised colour matching.  Reputable Rendering offer a wide variety of rendering finishing types, allowing you to choose one that complements the existing appearance or suits prevailing weather conditions.

Our expertise focuses on Grade I and II listed buildings, ensuring the preservation of the original structure’s authenticity. With extensive experience in managing Listed Building Consent and collaborating closely with conservation officers, we are well-equipped to assist you throughout the entire process, providing guidance at every stage and handling the submission of any necessary documentation on your behalf.

Breathable & Flexible Non-Hydraulic Lime Render

One of the most notable features of non-hydraulic lime render is its breathability.  This property allows moisture to escape from the substrate, preventing potential structural damage such as mould growth or decay.

It is particularly suited for the careful preservation of historic buildings, as its inherent flexibility enables it to accommodate substrate movements without cracking.

Aesthetics & Improved Environment

The application process involves multiple layers of render, resulting in a smooth or textured finish that is aesthetically pleasing and offers substantial weather resistance. Additionally, its natural properties enhance energy efficiency within buildings by helping to maintain comfortable indoor climates.

Non-Hydraulic Lime Render Strength & Texture

Reputable Rendering can select suitable aggregates to achieve the desired texture while ensuring the strength of the original substrate is matched, all while maintaining the structure’s breathability.

Flexibility & Vapour Permeability

Non-hydraulic lime can be applied below the damp-proof course (DPC) level, where increased vapour permeability is beneficial.  Its flexibility makes it particularly suitable for timber-frame buildings, Tudor properties, wattle and daub, as well as lath ceilings and partitions.

Synthetic fibres & courser aggregate can also be incorporated into the first coat to enhance this flexibility & strength.

Self-Healing

The self-healing property of lime render significantly enhances its durability by allowing it to repair minor cracks and imperfections caused by environmental factors or structural movements.  This process occurs when moisture and carbon dioxide interact with calcium hydroxide in the render, resulting in a chemical reaction that reformulates calcium carbonate, effectively filling cracks.

This capability not only maintains the aesthetic appeal through a smooth or textured finish but also protects the underlying structure by minimising moisture ingress and preventing further damage.  Additionally, this self-healing feature aligns with sustainable building practices, extending the material’s lifespan and reducing the need for extensive repairs, making lime render an ideal choice for conservation projects and historic buildings where preserving original materials is crucial.

Non-Hydraulic Lime Rendering Summary

The self-healing capability of lime render is a significant benefit, ensuring resilience and effectiveness in protecting structures while supporting sustainable building practices.

Ultimately, non-hydraulic lime render is a sustainable and versatile option for construction and restoration, valued for its historic authenticity, aesthetic charm, and environmental benefits.

Chalk Down Lime Ltd

For further details about one of our selected materials manufacturers, please click here: www.chalkdownlime.com