the four ingredients that make up the recipe for fiber cement sidingd
Photo: Brian Henn/Time Inc. Digital Studios
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What's in Fiber Cement?

The basic recipe has just four ingredients.

Water: Dissolves the wood pulp; activates and hardens the cement.

Wood pulp: Improves flexibility and resilience.

Fly ash: Acts as a filler. (Some makers use silica sand instead.)

Portland cement: Binds the ingredients. Made with limestone, clay, and iron.
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