(The average lifespan of concrete roof tiles is about 50 years.) Because they wear so well over time, clay roof tiles add significantly to a home's resale value.

As the nation's largest manufacturer of concrete roof tile, we wanted to respond to "Staying on Top of Roofing Options" by Marcie Geffner, Feb. 11.

Concrete roof tiles weigh quite a bit when compared to other roofing materials such as metal, asphalt, and clay. They may weigh between 820 and 1,100 lb for every 100 square feet.