When homeowners think about their roofs, they often picture shingles or tiles. But beneath that visible layer is a critical structural component: roof decking. Understanding the basics of roof decking—including roof decking thickness, roof decking material, and types of roof decking—is essential for making informed decisions about roof repairs or upgrades.
What Is Roof Decking?
Roof decking, also called roof sheathing, is a layer of boards or panels laid over the rafters or framing of your roof. This layer acts as a flat, stable surface for roofing materials like shingles, tiles, or metal to be attached. Roof decking not only supports these materials, but also helps distribute weight evenly, acts as a weather barrier, and ensures the overall structural integrity of the roofing system.
Roof Decking Thickness: What to Know
Not all roof decking is created equal. The thickness of your decking directly impacts its durability, strength, and ability to support your roofing system.
- Standard Thickness for Residential: The most common thicknesses for wood roof decking are 1/2 inch or 5/8 inch. Many roofing professionals recommend 5/8 inch for optimal strength—especially in areas with snow or high winds.
- Minimum Thickness: Building codes often set the minimum thickness for plywood decking at 3/8 inch, and 7/16 inch for oriented strand board (OSB). Thicker sheathing reduces sagging, improves fastening strength, and resists moisture better.
- Commercial & Heavy Duty: For commercial roofs and wide-rafter spans, thicknesses of 3/4 inch or even greater may be specified, particularly where heavier roof coverings are used or stricter codes apply.
- Check Local Codes: Always consult professional roofers and local codes to ensure your roof decking meets all standards for safety and longevity.
Types of Roof Decking Materials
Selecting the right roof decking material can maximize your roof’s performance and lifespan. The most common options include:
- Plywood: Durable, readily available, and strong. Common in homes built after the mid-1970s.
- Oriented Strand Board (OSB): Engineered from wood strands and resins, OSB is budget-friendly and widely used.
- Metal Decking: Often used for flat or low-slope commercial roofs; prized for its fire resistance and strength.
- Concrete Decking: Less common in homes but used for high-load commercial structures.
Your choice will depend on factors like roof design, climate, loading, and budget.
Explore Decking Choices at Bridgewater Roofing’s Showroom
Bridgewater Roofing’s showroom features samples of roof decking materials and systems, allowing you to see and feel the differences before making a decision. Our team will walk you through the pros and cons of each option and recommend the ideal thickness and type for your building.
Contact Bridgewater Roofing for Roof Decking Repairs or Upgrades
A strong, well-built roof starts with the right decking. For repairs, replacements, or upgrades, trust Bridgewater Roofing’s experience and commitment to quality. Contact us today to schedule a consultation—or stop by our showroom for a personal look at your options.