What is fiber cement siding?

Fiber cement is a combination of cement reinforced with cellulose fibers. This makes this type of cement a great option for outdoor siding that is capable of surviving the harshest of elements.  

At a glance, fiber cement siding very often consists of overlapping horizontal boards, imitation wood siding, and imitation shingles. The size of the sheets will vary depending on the company producing them. But in general, they come in sheets that normally range between 2400 – 3000 mm in length and 900 –1200mm in width.

When it comes to thermal resistance and sound transmission, fiber cement is not the best option, in fact, not even a good one.  In general, the thicker and denser the product the better resistance it will have to temperature and sound transmissions. 

The basic recipe for fiber cement has four main ingredients:  water, wood pulp, fly ash, and cement. The water is used to dissolve the pulp while it activates and hardens the cement. 

The wood pulp improves resilience and flexibility.  The fly ash acts as filler and the cement binds the ingredients.   

There are several reasons why fiber cement siding is widely used for the covering of commercial and domestic buildings. Fiber cement is a nice combination of good looks, durability, maintenance, and affordability.  


Fiber cement siding has proven excellent with impact resistance. Fiber cement is not susceptible to rotting or termites and is resistant to fire.  


The external cladding requires very little maintenance once it is installed and painted.  Just like wooden siding, it is necessary to spray it with a garden hose every 6 to 12 months. 


The most common type of fiber cement siding ranges from 70 cents to about $5.25 per square foot uninstalled. Shingles can cost anywhere from $2 to $8.