fibercement

Fibercement, or fiber-reinforced cement, is a composite material consisting of cement, sand, water, and reinforcing fibers. Historically asbestos fibers were used, but modern products rely on cellulose or mineral fibers to reduce health risks. It is produced in sheets or boards for exterior siding, interior panels, and other cladding applications.

Production involves mixing Portland cement, aggregates, water, and fibers, forming into sheets or boards, and curing. Product lines vary in texture and thickness, with common siding panels around a few millimeters thick. The fiber reinforcement enhances strength and crack resistance.

Fibercement offers high dimensional stability, fire resistance, and rot and insect resistance, with good paint adhesion. It is heavier than many alternatives and can crack if subjected to severe impact or improper installation. Proper flashing and ventilation are important to minimize moisture-related issues.

Common uses include exterior siding, wall panels, and soffits in residential and commercial construction. It provides long service life with low maintenance, but requires skilled installation and periodic repainting in some climates.

Standards such as ASTM C1186 govern fiber-reinforced cement siding and boards. Environmental considerations include the energy use of cement production; some products use recycled fibers and low-emission coatings. Availability and performance vary by region.