Can Felt Paper Be Used as Siding on a Home

Felt paper, also known as building paper or asphalt-saturated felt, is a traditional weather barrier used behind siding. While it plays a critical role in protecting walls from moisture and air infiltration, it is not designed to function as the exterior finish itself. This article examines whether felt paper can be used as siding, what codes and performance expectations apply, and practical alternatives for homeowners seeking durable, code-compliant cladding solutions.

What Is Felt Paper And How It Works

Felt paper is a thin, flexible sheet impregnated with asphalt or other waterproofing materials. It serves as a moisture barrier and vapor retarder when installed between the wall sheathing and siding. Its primary purpose is to reduce water intrusion, allow drainage, and improve energy efficiency by limiting air leaks. Felt paper comes in different weights and grades, with common types including 15-pound, 30-pound, and synthetic or newer wrap products that meet various building code requirements.

Why Felt Paper Is Not Siding

The exterior aesthetic and protection offered by a siding material differ significantly from what felt paper provides. Felt paper is designed to be covered by a finished siding system, not to withstand prolonged weather exposure or provide the necessary UV resistance, physical durability, or decorative appearance required of exterior cladding. Exposing felt paper directly to sun, wind, and impact can lead to rapid deterioration, tearing, and compromised moisture barriers.

Code and Building Standards

Building codes typically require a weather-resistive barrier (WRB) behind the siding, such as building paper or house wrap, rather than relying on felt paper as the exterior surface. The WRB must meet local code specifications for permeability, wind resistance, and fire safety. Siding products and installation methods are then selected to meet climate, wind zones, and aesthetic requirements. Using felt paper as exterior siding would generally not comply with modern codes and could void warranties and insurance coverage.

Benefits and Limitations of Felt Paper as Part of a System

Benefits: Felt paper helps control moisture migration, provides an additional air barrier when properly integrated, and is relatively inexpensive as a component of the wall system. Limitations: It cannot resist UV exposure, impact, or weathering like siding materials, and it lacks the aesthetic appeal and durability required for exterior finish. Over time, exposed felt can crumble, tear, or become brittle, leading to moisture issues inside wall cavities.

Practical Alternatives for Exterior Cladding

For homeowners seeking durable, code-compliant exteriors, several siding options outperform felt paper as a finish. Common choices include:

• Vinyl Siding: Affordable, low maintenance, and water-resistant when installed correctly with a WRB and proper flashing.
• Fiber Cement Siding: Highly durable, fire-resistant, and available in various textures; requires careful installation over a WRB.
• Engineered Wood Siding: Balanced aesthetic and durability with moisture protection when properly installed.
• Stucco or EIFS: Provides a seamless exterior with excellent moisture control when installed by professionals.
• Brick or Stone Veneer: Long-lasting options with minimal maintenance, depending on installation details.

These options should be installed over an approved weather-resistive barrier to ensure proper moisture management and energy efficiency.

Installation Considerations If Replacing Felt Paper

If a home currently uses felt paper behind existing siding or is undergoing a renovation, the recommended approach is to replace the WRB with modern materials. Key steps include:

• Remove old siding carefully to inspect sheathing for rot or damage.
• Install a high-performance WRB, such as a breathable, taped house wrap or a liquid-applied barrier, per manufacturer instructions.
• Choose siding material compatible with climate, wind loads, and building code requirements.
• Use proper flashing at windows, doors, corners, and transitions to prevent water intrusion.
• Seal and fasten according to product specifications to maintain warranty and performance.

Professional installation is strongly advised to ensure the system performs as intended and to preserve structural integrity.

Maintenance And Longevity Considerations

A well-installed siding system over a WRB typically lasts longer and requires less maintenance than DIY approaches relying on older methods. Regular inspections should focus on:

• Inspection of flashing and sealants around openings and penetrations
• Checking for signs of moisture intrusion, staining, or peeling
• Cleaning exterior surfaces to prevent mold growth and keep drainage paths clear
• Monitoring for paint or coating deterioration on wood-based claddings

With proper maintenance and timely repairs, modern siding assemblies can outperform traditional felt-paper-based approaches in durability and energy efficiency.

Environmental And Aesthetic Considerations

Beyond performance, homeowners should consider the environmental impact and curb appeal. Some siding materials use recycled content, low-VOC finishes, or sustainable manufacturing processes. Aesthetic options range from smooth, uniform finishes to textured profiles that mimic wood or stone. The choice should align with the home’s architectural style, neighborhood standards, and resale value while ensuring long-term protection from the elements.

Common Myths About Felt Paper As Siding

Myth: Felt paper is a cost-saving exterior finish. Fact: The cost savings are offset by high maintenance, poor durability, and code compliance issues. Myth: Any felt paper can endure outdoor exposure. Fact: Felt paper deteriorates quickly when exposed to sun and weather, making it unsuitable as an exterior cladding. Myth: Modern WRBs are unnecessary if felt paper is used. Fact: Contemporary WRBs are essential and must be compatible with chosen siding for proper performance.

Conclusion: Appropriate Use Of Felt Paper

Felt paper should not be used as siding on a home. It is intended as a moisture and air barrier behind the exterior finish. For lasting protection, a modern, code-compliant weather-resistive barrier paired with a durable siding material is essential. Homeowners should consult licensed contractors to select appropriate materials, ensure proper installation, and maintain compliance with local building codes and warranty requirements.