Stucco siding is a siding material made of Portland cement, sand, lime, and water. Applied in three coats over a lath base, it provides a solid, durable, and seamless home exterior. Some advantages of stucco include a natural resistance to fire, lasting durability, and low maintenance.Stucco is one of the most popular exterior finishes for homes. It’s an attractive, low-maintenance and fire-resistant sheathing. But, like any building product, it’s only as good as its application. … Traditional stucco siding is made of Portland cement, sand, lime and water – similar to concrete.