Industry Segment Information
Our operations are organized into five segments: Cement, Concrete and Aggregates, Gypsum Wallboard, Recycled Paperboard and Oil and Gas Proppants. Although we have five segments, we participate in three businesses. Our Cement and Concrete and Aggregates segments participate in the construction products sector, our Gypsum Wallboard and Recycled Paperboard segments participate in the building materials sector and our Oil and Gas Proppants segment participates in the oil and gas exploration sector. A further description of these business segments can be found on pages 3-19.
We operate seven cement plants (one of which belongs to our joint venture company), one slag grinding facility and seventeen cement distribution terminals. Our 5.2 million tons of clinker capacity is approximately 5% of total U.S. clinker capacity. Our cement companies focus on the U.S. heartland in Texas, Oklahoma, Missouri, Nebraska, Kansas, Colorado, Wyoming, Ohio and Nevada, as well as the Chicago, Illinois metropolitan area. Our joint venture also owns a minority interest in an import terminal in Houston, Texas and can purchase up to 495,000 short tons annually from this cement terminal. Slag is ground in the greater Chicago, Illinois area and sold primarily in Illinois, Pennsylvania, Iowa, Ohio, Minnesota, Missouri and Kansas.
We have three concrete and aggregates businesses, which consist of seventeen concrete batching plants and four aggregates facilities. The concrete and aggregates business is more local in their operations, and serve the areas immediately surrounding Austin, Texas, the greater Kansas City area and north of Sacramento, California. Demand for cement, concrete and aggregates may fluctuate more widely because local and regional markets and economies can be more sensitive to changes than the national market, as well as being more susceptible to seasonal impact due to adverse weather.
We operate five gypsum wallboard plants, including one plant, in Bernalillo, New Mexico, that has been idled since 2009. Gypsum wallboard is distributed throughout the U.S. with particular emphasis in the geographic markets nearest to our production facilities, which are in Albuquerque and Bernalillo, New Mexico; Gypsum, Colorado; Duke, Oklahoma; and Georgetown, South Carolina. We are planning to restart our Bernalillo plant during fiscal 2018, and anticipate running this plant as necessary to meet customer demand. We also operate a recycled paperboard business which sells internally to our wallboard business as well as to external customers. Our paperboard plant is located in Lawton, Oklahoma. Our gypsum wallboard and paperboard operations are more national in scope and shipments of wallboard and paper are made throughout the continental U.S., except for the northeast, and therefore are more impacted by national trends.
We operate three frac sand wet processing facilities, three frac sand drying facilities and six frac sand trans-load locations. During the fourth quarter of fiscal 2016, we idled our Corpus Christi, Texas frac sand processing plant and our Kenedy, Texas and Fowlerton, Texas trans-load facilities, along with our Utica, Illinois frac sand mine. We intend to re-open the idled facilities when market conditions improve. Frac sand and oil well cement is currently sold into shale deposit zones across the United States. Demand for oil and gas proppants is impacted primarily by rig counts and well completion activity.
Demand continues to increase for our construction products and building materials businesses, as underlying economic fundamentals in the U.S. continued to improve during calendar 2016. Cement consumption in the United States, as estimated by the Portland Cement Association, increased approximately 2% to 101.0 million short tons in calendar 2016, compared to 99.0 million short tons in calendar 2015, with imported cement consumption increasing to approximately 14% of total sales in calendar 2016, compared to 13% in calendar 2015. Consistent with the increase in cement consumption nationally, our cement sales volumes increased 2% in fiscal 2017 compared to fiscal 2016.
Demand for gypsum wallboard continues to improve as well, as industry shipments of gypsum wallboard increased to 24.7 billion square feet in calendar 2016, compared to 22.0 billion square feet in calendar 2015, primarily due to increases in single family and multi-family housing starts during calendar 2016 compared to calendar 2015.