When Should You Replace Roof Sheathing
Home Renovation

When Should You Replace Roof Sheathing

What Is Roof Sheathing

Commonly referred to as “roof decking,” roof sheathing is a sturdy layer of wooden boards (and, in some cases, concrete, metal, or steel sheets) affixed to a roof’s joists and trusses. These boards or sheets form a foundation for a home’s roofing system.

Asphalt shingles (or whatever exterior roofing material a home utilizes) typically attach directly to the roof sheathing. Usually, if wooden boards are used, they receive a waterproof coating before installation as further protection from external elements.

The Purpose Of Roof Sheathing

To perform optimally, selecting the correct type of roof sheathing is vital.

  • Acts as a waterproof barrier.

Sheathing offers an essential barrier against water leaks and moisture intrusion.

  • Evens out weight distribution.

Laid equally across roof joists and trusses, sheathing distributes the weight of foot traffic, snowfall, or foreign objects evenly.

  • Secures the exterior roofing material.

Affixing asphalt shingles becomes much easier with a hard surface.

  • Supports roofing components.

Sturdy sheathing secures roofing components, including flashings and drip edges.

When Should You Replace Roof Sheathing

When To Replace Roof Sheathing

Sheating may need replacement if any of the following signs are observed:

Occasionally, a board breaks due to excess weight in a concentrated area.

  • Interior water or moisture damage.

The sheathing may have issues if leaking or molding happens inside the home.

  • Sagging ceiling or roofline.

A visible sag means that excess weight is pressuring the sheathing unnaturally.

  • Wood rot to the sheathing.

Rot occurs when persistent moisture softens the boards and causes erosion.

What Type Of Roof Sheathing Works Best

Wood sheathing comes in two primary forms. Oriented Strand Board (OSB) is popular because of its durability, water resistance, and cost-effectiveness. It also possesses a consistent thickness that lays evenly. CDX, a plywood decking, consistently offers greater stability than OSB. However, CDX tends to have a lower moisture resistance than OSB and operates less effectively in higher humidities or wetter environments.

What To Do If Roof Sheathing Needs Addressing

If a homeowner suspects that sheathing requires attention, contact a knowledgeable roofing company with expertise in inspecting roof systems. As the Twin Cities Remodeling Experts, Midwest Roofing, Siding & Windows provides Minnesota’s best roofing, siding, windows, and insulation solutions. We help homeowners identify problems with their sheathing and offer permanent solutions to stabilize and strengthen their roofing system. Contact us today to schedule a free roofing inspection.