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Materials & Specificationsaka: HardiePlankaka: HardieBoardaka: fiber cement siding

Fiber Cement

In Plain English

A durable exterior siding material that looks like wood but resists rot, insects, and fire.

Definition

Fiber cement is a composite exterior cladding material made from Portland cement, sand, and cellulose fibers, designed to mimic the appearance of wood siding, stucco, or masonry while providing superior resistance to moisture, insects, fire, and rot. It is one of the most popular exterior siding materials in residential and light commercial construction. Fiber cement requires factory or field painting and proper installation to perform as intended.

Why It Matters in Bidding

Fiber cement siding carries higher material and labor costs than vinyl or engineered wood, and its weight, cutting requirements, and dust controls affect crew productivity, so estimators must price it from the actual product and profile specified. Finish responsibility is a frequent scope dispute, making it critical to confirm whether the bid includes factory-finished panels or field painting.

Example

A siding estimator takes off lap fiber cement by the square, adds waste for cutting and corner trim, and clarifies in the proposal that prefinished panels are assumed so field painting falls outside the bid.

Related Terms

CladdingSheathingStuccoFlashing

Frequently Asked Questions

It depends on whether prefinished or primed product is specified. Prefinished panels carry a higher material cost but reduce field labor, while primed product requires field painting that may fall to a separate painter. Estimators should state their finish assumption clearly to avoid a scope gap at award.
Waste depends on the wall geometry, number of openings, and panel versus lap product, with cutting and breakage on long boards driving the figure. Estimators apply a percentage based on plan complexity and add separate quantities for trim, corners, and starter pieces rather than burying them in a single allowance.
Fiber cement is heavier, requires specialized blades and dust control when cut, and often needs two people to handle long boards, all of which lower productivity. Those labor factors, plus higher material cost, mean estimators apply different unit rates than for lighter siding products.

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