Can Earthaus Plasters be applied in areas exposed to high heat?Updated 19 days ago

Earthaus Plasters generally perform well in areas exposed to high heat. These materials are lime-based and naturally resistant to thermal stress, making them suitable for surfaces near fireplaces, stoves, and radiant heat systems.

Lime plaster is non-combustible and does not emit toxic fumes when exposed to fire, making it a safe choice for heat-prone areas. Its mineral composition provides excellent fire resistance, and in many historical and modern applications, lime plaster is used as a protective layer to improve fire safety in buildings.

However, hairline cracking can occur in environments with significant temperature fluctuations. This is typically caused by the expansion and contraction of the substrate beneath the plaster, especially in materials like wood framing or metal lath. These micro-movements can create fine, superficial cracks in the finish.

Hairline cracks are usually cosmetic and do not affect the integrity or performance of the plaster. In most cases, they do not require repair unless aesthetics are a concern.

To minimize the risk of cracking in high-heat applications:

• Use stable, non-combustible substrates such as masonry or cement board where possible.

• Reinforce transitions and vulnerable areas with appropriate mesh or fiber reinforcement.

• Allow adequate cure time between coats and ensure even drying.

Proper design, substrate choice, and application technique are essential for long-term durability in high-heat environments.