Lime render has been used for centuries in the UK to protect and beautify external walls. This traditional material is making a comeback in modern home renovation, thanks to its natural properties and aesthetic appeal. In this guide, we'll explore how to mix and apply lime render for external walls.
Lime render is made from a mix of lime, sand, and water. Unlike cement, lime is breathable and flexible, making it ideal for older buildings and those needing to manage moisture effectively.
A common ratio for lime render is 1 part lime to 3 parts sand. This can be adjusted for specific requirements and weather conditions.
Lime render is an excellent choice for external walls, particularly for those looking for a breathable, flexible, and environmentally friendly option. By following the right mix ratios and application techniques, UK homeowners can achieve a durable and visually pleasing finish.
A common mixing ratio for lime render is 1 part lime to 3 parts sand. This can be adjusted based on the specific requirements of your project and the prevailing weather conditions.
Lime render takes longer to dry and cure compared to cement render. It can take several days to dry and up to several months to fully cure, depending on the thickness of the application and the weather conditions.
Lime render is particularly suitable for older, historic buildings and those built with materials that need to 'breathe'. It's not recommended for non-porous or damp-proofed surfaces without proper preparation.
Yes, lime render is considered more environmentally friendly than cement-based renders. Lime is a natural, sustainable material that has less embodied carbon than cement.
Yes, natural pigments can be added to lime render to achieve various colors. It's important to use pigments compatible with lime to ensure an even color distribution and stability.
Yes, surface preparation is crucial. The wall should be clean, stable, and free of loose material. It may be necessary to dampen the wall slightly before applying the render.
Lime render should be applied in thin coats using a trowel. The first coat, known as the scratch coat, should be scored to provide a key for subsequent coats.
Each layer of lime render should be around 10mm thick. However, this can vary depending on the specific requirements of the wall and the desired finish.
Common issues with lime render include cracking if it dries too quickly or poor adhesion if the mix is incorrect or the surface is improperly prepared.
Lime render requires periodic maintenance, which may include minor repairs and repainting every few years, depending on the environmental conditions and the quality of the application.
