Estonias Purdemurru Limestone, or any limestone for that matter, may not be the most suitable choice for exterior applications in very humid climates. Limestone is a sedimentary rock that is susceptible to weathering, erosion, and moisture absorption.

In very humid climates, with high levels of moisture in the air, limestone can absorb this moisture and become saturated. This can lead to a variety of problems, including the growth of mold, algae, and moss, which can cause the limestone to deteriorate and lose its aesthetic appeal.

Furthermore, the freeze-thaw cycles that often occur in humid climates can also cause cracking and damage to the limestone. Water can seep into the pores of the stone, freeze during colder temperatures, and expand, ultimately leading to fractures and weakening of the material.

If using Purdemurru Limestone in exterior applications in very humid climates is unavoidable, it is essential to take several precautions. These may include applying a high-quality sealer to protect the stone from moisture penetration, regular maintenance such as cleaning and removing any organic growth, and ensuring proper drainage around the limestone to prevent water accumulation.

It is always advisable to consult with local experts, architects, or stone professionals who have knowledge and experience with the specific climate conditions and the application of limestone in those areas. They can provide more accurate advice and recommendations based on the specific characteristics of the Purdemurru Limestone and the local climate.