What Are Sheathing Boards? A Homeowner’s Guide

When you’re planning a remodel or new build, you might hear your contractor mention sheathing boards. But what exactly are they — and why do they matter so much for your home’s structure and durability?

In this quick guide, we’ll break down what sheathing boards are, where they’re used, and what you should know as a homeowner.

What Is Sheathing?

In simple terms, sheathing boards are large panels that are fastened to the framing of a house or building. Their job is to create a solid, stable base for the exterior finish — like siding or roofing — and to strengthen the overall structure.

Where Are Sheathing Boards Used?

Wall Sheathing
Sheathing panels are installed over the exterior studs of your walls before siding goes up. This layer helps keep the walls square and rigid, prevents shifting, and provides a base for weather barriers that protect your home from moisture and wind.

Roof Sheathing
Roof sheathing sits over the rafters or trusses and supports the roofing material (shingles, metal, or tiles). It also helps tie the roof structure together for extra strength.

Floor Sheathing
While not always called “sheathing,” your subfloor panels work the same way — giving your flooring a sturdy, level base.

Common Types of Sheathing Boards

• Plywood: Durable, strong, and has been a trusted option for decades.
• OSB (Oriented Strand Board): A cost-effective alternative to plywood, made by compressing wood strands with adhesives. Widely used in modern construction.
• Foam Board: Not structural by itself but sometimes added for extra insulation and air sealing.
• Gypsum Sheathing: Used in commercial projects or fire-rated walls behind materials like stucco or brick.

Why Proper Sheathing Matters

Good sheathing makes a big difference in your home’s performance:

• Adds structural strength to resist wind and earthquakes.
• Supports your siding and roofing.
• Provides a flat, even surface for finishing materials.
• Helps protect against water leaks when installed with proper barriers.

Thinking About a Remodel?

At F&M Construction & Remodeling, we take pride in making sure every layer of your project — from the frame to the finish — is built right. Whether you’re replacing old siding, re-roofing, or planning a major remodel, our team checks that your sheathing is up to code, protected, and ready to last for decades.

Ready to update your home? Contact us today for a free estimate. We’ll walk you through every step — and make sure your remodel is as solid behind the walls as it is beautiful on the outside.