Admitted to the Union in the year 1846, Iowa is the 29th state of the United States. It is home to roughly 3,190,369 people, and ranks as the 26th largest state, occupying an area of 145,746 km². Enjoying a humid continental climate, Iowa sees extreme temperature in terms of both cold and heat. The climatic situation in the state is characterized by wet springs, hot and humid summers, and harsh, cold winters. Iowa sees almost 50 days of thunderstorms in a year, and heavy rains in and around June - both of which are an influence of tropical air coming in from the Gulf of Mexico. In the last 30 years, the state has seen an average of 47 tornadoes per year. Precipitation is mostly rain - and while Iowa does see snowfall, it is much lighter and lesser compared to its neighboring states.
The main requirement of properties in Iowa - residential or otherwise - is to have roofs that can withstand the force of hurricanes and tornadoes with the least possible damage. In terms of materials used, there is more than one way to achieve this. Aside from standard clay and concrete tiles, shakes, slate and asphalt, and metal roofing systems, architectural and 3-tab shingles are also fairly popular. The former resembles shake shingles, but are heavier to withstand high winds and precipitation, while 3-tab shingles are made from asphalt, and are installed in threes (hence the name), making installation and maintenance easier.