What Is OSB and How Is It Used in Homebuilding?

When it comes to residential construction, few materials are as essential and versatile as OSB, or Oriented Strand Board. At RoMac Building Supply, we stock a variety of OSB products trusted by contractors and builders throughout Central Florida. Whether you’re framing a new home or sheathing a roof, understanding what OSB is—and the different types available—can help ensure you’re choosing the right product for the job.

What Is OSB?

OSB is an engineered wood panel made by compressing layers of wood strands with wax and adhesive resins under high heat and pressure. The strands are oriented in specific directions to increase strength and durability, giving OSB its name. It’s an affordable and reliable alternative to plywood, and it’s widely used in structural applications due to its uniformity and load-bearing properties.

Types of OSB

There are several types of OSB panels, each designed for specific uses in residential construction:

1. Standard OSB

This is the most common type, used for wall and roof sheathing as well as subflooring. It’s strong, cost-effective, and available in multiple thicknesses to meet different code requirements.

2. OSB with Tongue and Groove (T&G)

T&G OSB panels are designed for subfloor systems. The interlocking edges provide extra support between joists, reducing flex and preventing squeaks in flooring systems.

3. OSB with Moisture Resistance (Exposure 1 or Rated Sheathing)

These panels are treated to withstand temporary moisture during construction. While not waterproof, they resist warping and swelling better than untreated panels, making them ideal for roof decking and wall sheathing.

4. Radiant Barrier OSB

This OSB is backed with a reflective foil layer to reduce radiant heat transfer, often used in roof decking in hot climates. It can help improve a home’s energy efficiency by lowering attic temperatures.

5. Structural Insulated Panels (SIPs)

While not as commonly used, SIPs are prefabricated panels made of OSB sandwiched around foam insulation. They’re used for high-performance walls, floors, and roofs, offering exceptional strength and thermal performance.

Common Uses of OSB in Home Construction

• Wall Sheathing: Provides structural rigidity and a solid surface for attaching siding or house wrap.

• Roof Sheathing: Serves as the base layer for roofing materials like shingles or metal roofing.

• Subflooring: Creates a stable base for finished flooring when used in conjunction with joists.

• Structural Bracing: Used to resist lateral loads (like wind or earthquakes) in framed walls.

Why Builders Choose OSB

• Cost-Effective: OSB is generally less expensive than plywood.

• Consistent Quality: Fewer voids or knots compared to plywood.

• Strong and Durable: Suitable for load-bearing applications when installed correctly.

• Versatile: Can be used in various areas of a home’s structure.

Count on RoMac for Your OSB Needs

Whether you’re building a custom home or framing a multi-unit project, RoMac Building Supply has the right OSB products for your job. Our knowledgeable team can help you select the best panel for your application—and ensure you meet local code requirements every step of the way.

Stop by your nearest RoMac location or contact us today to learn more about our OSB inventory and delivery options.