Can Hardie Board Be Stored Outside?

Hardie board, also known as fiber cement, is a durable, low-maintenance siding material widely used in residential and commercial construction. One of the most common questions homeowners and constructors ask is whether they can store this material outside before installation. The short answer is yes, but there are crucial factors to consider to ensure the product's longevity and performance.

To understand if hardie board can be stored outside, we must first delve into its composition and the implications of exposing it to various weather elements. Hardie board is composed of a mix of concrete, sand, and cellulose fibers, making it resistant to rot, insects, and fire. However, it's still susceptible to moisture damage, particularly when exposed to prolonged significant rainfall or snow buildup.

Understanding Hardie Board's Weather Resistance

Hardie board is designed to withstand a wide range of weather conditions. It's engineered to expand and contract with temperature changes, helping to maintain its structural integrity. However, while it's resistant to weather, it's not immune to its effects.

Exposing hardie board to the elements before installation can cause it to absorb moisture, leading to potential issues during installation and impacting its service life. Therefore, it's crucial to understand the optimal storage conditions for this material.

Proper Outdoor Storage

Storing hardie board outside can be done safely and effectively if you follow a few guidelines. The primary goal is to keep the material off the ground and prevent it from getting soaked.

Nail the bundles to a wooden frame or pallet, ensuring they're raised off the ground to prevent absorption of ground moisture. Additionally, cover the bundles with a tarp, securing it on all sides but leaving the ends open for ventilation. This allows for airflow, preventing moisture buildup while protecting the hardie board from direct rain and snow.

Length of Outdoor Storage

The length of time hardie board can be stored outside depends on several factors, such as the weather conditions in your area, the size of the bundles, and the manufacturer's recommendations. Typically, it's recommended not to store the material outside for more than a few weeks, especially in areas with high rainfall or snowfall.

Regularly inspect the hardie board during storage. If you notice warping, moisture absorption, or other signs of damage, it's best to remove the affected pieces and replace them if necessary. Always follow the manufacturer's guidelines for proper storage and handling to ensure the product's longevity and performance.

Installation Considerations After Outdoor Storage

Even with proper outdoor storage, hardie board may absorb some moisture. Therefore, it's essential to consider a few installation aspects to ensure the material performs at its best.

Before installation, check the moisture content of the hardie board. If it's too high, you may need to acclimate the material to your job site's conditions. This process involves allowing the hardie board to absorb a specific amount of moisture to reach equilibrium with the surrounding environment. Always follow the manufacturer's guidelines for acclimating hardie board.

Proper Ventilation

Proper ventilation is critical for preventing moisture buildup behind the hardie board siding. Ensure you follow best practices for ventilation, such as installing a house wrap and creating a gap between the siding and the house wrap.

Also, consider installing vents at the top and bottom of your walls to facilitate airflow. These vents help prevent moisture from building up behind the siding, which could lead to mold, mildew, or other moisture-related issues.

Fastened Installation

Hardie board should be installed with the correct fasteners, spaced appropriately, and driven in flush with the surface. This helps prevent moisture from getting trapped behind the siding, which could otherwise lead to warping or other damage.

Always follow the manufacturer's recommendations for the appropriate fasteners and spacing. Additionally, consider using colored or stainless steel fasteners to prevent rusting, which can stain the siding and create a maintenance issue.

In summary, hardie board can be stored outside, but it's essential to understand the potential impacts of weather exposure and follow proper storage and installation practices. By doing so, you can ensure that your hardie board siding will perform at its best, providing decades of durable, low-maintenance protection for your home or building.