Fiber cement has become one of the most common commercial cladding materials because it is durable, dimensionally stable, and resists moisture, rot, and fire — but it only performs when it is installed and detailed as a system.
Fiber cement cladding has spread across commercial and multifamily buildings for good reasons: it is durable, dimensionally stable, resists moisture and rot, and offers good fire performance at a reasonable cost. It comes as large panels, plank siding, and trim in a wide range of finishes. But like every cladding, it is only as good as its installation — fastening, joints, and especially whether it is run as a drained rainscreen determine whether it performs for decades or causes problems. Understanding what fiber cement is and how it should be detailed is what turns a proven material into a proven wall.
The value is in treating it as a system. The sections below cover the four aspects that matter most — what fiber cement is, panels, planks, and finishes, installation and rainscreen use, and moisture, fire, and durability — and how ACE approaches fiber cement cladding.
These challenges rarely stay in one silo: the same discipline runs through how we approach dimension stone cladding, our field notes on glass fiber reinforced concrete panels, and the same playbook behind terracotta rainscreen cladding, and it all ladders up to ACE’s broader new-construction envelope design.
What fiber cement is explains why it performs so well as fiber cement cladding, because it is a composite of portland cement, fine aggregate, and reinforcing fibers such as cellulose, cured into a dense, rigid board that is dimensionally stable and resistant to moisture, rot, and insects. A cement-based board reinforced with fibers is the reason for its durability.
Because it is largely mineral, fiber cement does not rot, feed insects, or burn the way wood-based products can, giving it a fundamentally different durability and fire profile.
This composition also makes it dimensionally stable under temperature and moisture swings, which is part of why it holds up as an exterior skin, provided its joints allow for the small movement it does have.
Representative of the factors ACE weighs on fiber cement facades. Illustrative distribution, not a published statistic.
Panels, planks, and finishes are the forms fiber cement takes, and the form shapes both the look and the detailing, because large panels create a flat, modern facade, plank siding gives a lapped horizontal look, and both come in a wide range of factory or field finishes. Choosing the form and finish sets how the wall looks and how its joints are handled.
Large panels involve panel joints that must be detailed — open, gasketed, or backed — while plank siding laps and is fastened course by course, so each form has its own installation and joint considerations.
Factory-finished products offer consistent color and reduced field work, while field-finished boards allow custom color, so the finish choice trades control and durability against flexibility.
Fiber cement is installed tight to the wall over a marginal barrier with poor joints, so water is trapped and the assembly cannot dry.
Install the cladding over a continuous water-resistive barrier as a drained rainscreen, with corrosion-resistant fastening and detailed joints.
The cladding drains and dries, its fasteners and joints accommodate movement, and its moisture, fire, and durability advantages are fully realized.
Installation and rainscreen use are what most determine fiber cement’s performance, because the cladding should be installed over a continuous water-resistive barrier, ideally as a drained rainscreen with a cavity behind the boards so any water that gets past the face can drain and the assembly can dry. Running it as a drained rainscreen is the single biggest performance factor.
Fastening matters as well, since fasteners must be corrosion-resistant, correctly spaced, and placed so the boards can accommodate their movement without cracking, and joints must be detailed to shed or manage water.
Because the water-resistive barrier behind the cladding is the true weather line in a rainscreen, integrating the fiber cement with that barrier and its flashings at every opening and transition is central to the installation.
Get the cladding detailed as a drained rainscreen over a sound barrier so it performs for decades.
Schedule a consultationCall (866) 389-8883Moisture, fire, and durability are fiber cement’s defining advantages, because it resists moisture damage and rot, offers good fire performance owing to its mineral composition, and is durable against weather, impact, and time when properly installed. These properties are why it is specified so widely.
Its fire performance and moisture resistance make it attractive where combustible claddings are a concern or where wood-based products would deteriorate, which is much of the commercial and multifamily market.
The most valuable point overall is that fiber cement is a genuinely durable, moisture- and fire-resistant cladding, but realizing that durability depends on installing it over a sound water-resistive barrier — ideally as a drained rainscreen — with correct fastening and joints.
In ACE’s field work, most fiber cement cladding problems trace back to a few recurring locations — Drained rainscreen & WRB, Fastening & movement, and Joint detailing — rather than the open field of the wall or roof. The cost of resolving them climbs by roughly an order of magnitude at each stage: a detail corrected during design costs a fraction of the same fix during construction, which is itself far cheaper than a repair once the facility is operating. That economics is why we push envelope decisions as early in the project as possible.
Select panels or planks and the finish, and detail the joints to shed or manage water for the chosen form.
Install over a continuous water-resistive barrier with a drainage cavity so water drains and the assembly dries.
Use corrosion-resistant fasteners, correctly spaced, so the boards accommodate movement without cracking, integrated with flashings at openings.
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