Health and Safety Concerns With Lime Building Materials Below is an example of lath and plaster work.Īn example of how lime plasters are traditionally applied using laths as the substrate. These are around 20mm wide strips of timber, with gaps that the mortar can cling onto. Commonly, lime plasters are applied to laths. They work best with rough or porous surfaces as they require a mechanical key (think of this as something for the plaster to hold onto) to stick to the wall or ceiling. Good lime plasters can be applied to most substrates. If you have the choice, non-hydraulic lime plasters are the way forward. They are more workable, breathable and flexible than hydraulic plasters. Non-hydraulic plasters are the gold standard for lime plasters. Lime plasters are made by mixing a type of lime, either hydraulic or non-hydraulic (lime putty/fat lime), with various aggregates and water. These lime plasters are over 4000 years old and still intact and hard! Talk about durability! The ancient Egyptians used lime plaster inside temples and pyramids as a durable finish. Lime plasters are among the oldest building materials, along with mud bricks and plaster. A Brief Overview of Lime Plaster And its Uses Let’s take a closer look at what lime plaster is, its health risks, how to protect yourself from those risks, and the advantages of using lime plasters. In addition, a dust mask should be worn when removing old lime plaster, mortar or render. As a general guideline, always wear good eye protection and gloves when working with lime. Lime is caustic, which means it can cause burns if it comes into contact with your skin or eyes. ![]() However, the health risks must be understood. Lime is alkaline and caustic, so the correct safety measures must be taken. Lime plasters, like all other lime-building materials, use lime as a binder. When working with lime-based materials, it’s important to consider the safety risks.
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