Why some stones cannot be used for exterior applications?
The biggest reason why some stones cannot be used outside is that they cannot withstand the weather extremes. In places where you have weather conditions like snow and rain, or drastic changes in climate from cold to heat, some stones develop cracks or weather out easily. These stones cannot be used outside. Another factor to be considered is the slip resistance. If polished stone was to be used on a walkway, it could become slippery when wet. Yet another factor in considering the use of stone in exterior applications is how the color holds. Many green stones lose color when exposed to the sun’s ultraviolet rays for long periods of time. Additionally, some multicolored slates bleed colors as a result of an oxidation with water. Therefore it is very important to determine the suitability of a stone long before using it on exterior applications.
