Can sheathing function as a subfloor?

Differences Between Sheathing and Subflooring

Before we delve deeper into whether sheathing can function as a subfloor, it is crucial to understand the fundamental differences between the two materials.

1. Thickness: Plywood or OSB used for subflooring is typically thicker than sheathing. Subflooring typically ranges from 19/32 to 23/32 of an inch in thickness, while sheathing is commonly available in 15/32 to 1/2 inch options.
2. Strength and Stiffness: Subflooring is engineered to withstand heavy loads and resist deflection, ensuring a solid and even foundation for the finished floor. It has superior strength and stiffness compared to sheathing.

Pros of Using Sheathing as a Subfloor

1. Cost-Effective: Sheathing is usually less expensive than subflooring materials, which can be appealing to budget-conscious individuals.
2. Availability: Sheathing is readily available at most lumberyards and home improvement stores, making it easily accessible for construction projects.
3. Temporary Solutions: In some cases, sheathing can be used as a temporary subfloor for construction or remodeling projects. For instance, if the subfloor needs to be replaced entirely but the project is not yet ready for finished flooring, sheathing can serve as a temporary solution until the construction is complete.

Cons of Using Sheathing as a Subfloor

1. Reduced Strength and Stability: Sheathing is not engineered to provide the same strength and stability as subflooring. Due to its thinner profile, it may be more prone to deflection and may result in a less rigid and squeaky floor.
2. Moisture Vulnerability: While subflooring materials are designed to withstand moisture to some extent, sheathing is not. Using sheathing as a subfloor in areas prone to high humidity or potential moisture exposure can lead to warping, swelling, and overall degradation of the material.
3. Building Code Compliance: Depending on the local building codes, using sheathing as a subfloor may not meet the requirements for floor construction. It is essential to check with the local building department to ensure compliance with the regulations.

While sheathing can be used as a temporary solution or in specific circumstances, it is generally not recommended to use it as a permanent subfloor substitute. The reduced thickness and strength may result in an unstable and subpar foundation for the finished floor. In the long run, investing in proper subflooring materials such as plywood or OSB specifically designed for subfloor applications will ensure a durable and reliable floor that will stand the test of time.