Commercial Property Insurance Rating
Construction The most basic element of a building is its construction. This term means the materials from which a building is made. Many insurers classify buildings into categories based on their construction type using a system developed by the Insurance Services Office (ISO). This system includes the six classes described below. Each classification reflects both the building materials used (such as wood or concrete) and the combustibility of those materials. ISO’s categories are numbered from one through six in descending order of combustibility....