Limewashes with Linseed Oil and Its Effect on Water and Salt Transport

Paints are the protective and aesthetic skin of buildings, so (re) painting is one of the most recurrent maintenance actions. Limewashes have been used since antiquity and are currently of high interest for both conservation and new construction, majorly thanks to their eco-friendly and antiseptic features, and ability to improve the performance of the materials in relation to water transport. Linseed oil is a traditional water-repellent additive that can enhance the water-shedding properties of the limewashes. However, it has the risk of altering the drying kinetics of the substrate if an improper dosage is used. In this work, limewashes with the addition of varying dosages of linseed oil have been applied on two types of natural stone to study the effect of the paints in respect to water and salt transport. The water absorption by capillarity was reduced in both stones coated with pure limewash and limewash with oil, while the drying rate was slightly accelerated. The effect of the paints on the drying of the salt-laden stones varied. The salt damage developed during drying also diverged in both stones, damaging the coats and stone surface of the less porous stone and mainly promoting salt efflorescence in the most porous one.

Automated summary

Paints play a crucial role in protecting and enhancing the appearance of buildings, making repainting a common maintenance action. Limewashes, which have been used since ancient times, are currently of great interest due to their eco-friendly and antiseptic features, as well as their ability to improve materials' water transport performance. Adding linseed oil can enhance the water-repellent properties of limewashes, but improper dosage may affect the drying kinetics of the substrate. This study investigated the effects of limewashes with varying dosages of linseed oil on natural stones, focusing on water and salt transport. The results showed that water absorption by capillarity was reduced in both stones coated with pure limewash and limewash with oil, while the drying rate was slightly accelerated. The impact of the paints on drying and salt damage varied depending on the porosity of the stones.