Bad Fischau Trachyte is a type of volcanic rock that is typically used for interior applications such as flooring, walls, and countertops. While it is a durable material, its use in very rainy climates for exterior applications may not be ideal.

Trachyte is known to have low porosity, which means it absorbs minimal amounts of water. However, continuous exposure to heavy rainfall and moisture can still cause the rock to deteriorate over time. The constant wetting and drying cycle can lead to potential problems such as cracking, spalling, or discoloration.

If you are considering using Bad Fischau Trachyte for exterior applications in very rainy climates, it is essential to take certain precautions. Applying a high-quality penetrating sealer specifically formulated for natural stone can help minimize water absorption and protect the rock from moisture-related issues. Regular maintenance and sealing may also be required to ensure the longevity and appearance of the stone in such environments.

It is recommended to consult with local professionals or stone suppliers who have experience with the specific climate and conditions in your region to determine the best stone options for your exterior application needs.