NRCA clay tiles are fired in kilns at temperatures ranging from:

• A. 1,900F to 2,300F
• B. 1,200F to 1,400F
• C. 2,500F to 2,800F
• D. 1,000F to 1,200F

Answer: (A)

Clay roof tiles are fired at very high temperatures so the ceramic body densifies and any glaze matures, giving strength and weather resistance. For NRCA clay tiles, firing roughly 1,900 to 2,300 degrees Fahrenheit achieves the right balance: the clay undergoes sufficient sintering to be strong and less porous, which helps resist water absorption and freeze–thaw damage, while the glaze (if used) matures without running or defects. If fired much cooler, the tile would remain too porous and weaker, compromising durability. If fired much hotter, you risk glaze defects, warping, or excessive vitrification that can make the tile brittle or unstable. This temperature range is chosen to produce durable, consistent roofing tiles suitable for typical climates.