Because the basic sections of the structure are not integrated, modern architecture makes use of steel or concrete structural frameworks, a process that is typically not as strong as traditional construction. This feature of contemporary construction allows for water infiltration, which eventually degrades the structure over time. Traditional buildings are made of stone or brick and use an integral design and construction strategy that ensures durability. Traditional Nepali buildings are generally constructed using monolithic blocks of stone or brick. The walls of the building are generally between three and eight feet high and depend on its location for their strength. Stone and brick have been used in Nepal for thousands of years so they are very durable materials that can withstand extreme weather conditions. However, these structures must be maintained by periodically repointing or re-bricking them to preserve their appearance and functionality. In contrast, the components of a modern building's structure can be made of wood or metal and often include internal support beams, floors, and roofs that are attached to the exterior of the building. These elements provide greater flexibility than monolithic stones or bricks but lack their strength and durability. For example, wood is much more likely to rot if it gets wet, and steel supports will rust if not coated. Modern buildings also tend to be less stable in heavy wind conditions. Traditional buildings are not only stronger but they are also designed to last forever.