Kalkmørtler

Kalkmørtler, also known as lime mortar, is a traditional building material used in the construction of historic buildings, particularly in Denmark and other Scandinavian countries. It is made by mixing lime with sand, often with the addition of other materials such as gravel or chalk. The lime is typically derived from burning limestone, which releases carbon dioxide and produces quicklime. This quicklime is then mixed with water to create slaked lime, which is the active ingredient in lime mortar.

Lime mortar has several advantages over modern cement-based mortars. It is more durable and resistant to water penetration, making it suitable for use in areas with high humidity or exposure to rain. It also has a higher compressive strength, which makes it ideal for load-bearing walls. Additionally, lime mortar is more environmentally friendly, as it is made from natural materials and produces less carbon dioxide during its production process.

However, lime mortar also has some disadvantages. It requires more time to set and cure, which can make it more difficult to work with in hot or cold weather. It is also more susceptible to damage from acid rain and other forms of air pollution. Despite these drawbacks, lime mortar remains a popular choice for historic preservation and restoration projects, as it can help to preserve the character and authenticity of older buildings.