What Is Sheathing On A Roof?
What Is Sheathing On A Roof?
Sheathing on a roof is the structural/non-structural covering between the roof structure and the outer surface material of shingles or other roof coverings. It acts as the base upon which other roofing materials such as shingles, tiles, or metal roofing can be installed.
Sheathing is typically made from plywood or OSB (oriented strand board), but other composite materials like fiberboard and hardboard may also be used.
Sheathing provides structural support to the entire roof structure and increases its integrity, as well as providing an even surface for shingle nailing during installation and insulating against outside temperatures.
It usually consists of wood boards or large sheets of plywood that are nailed to rafters to create a uniform base for shingle application, making it an essential part of any sound roofing system.
Installing sheathing requires a sufficient amount of nails, screws, or adhesive to attach it securely to the underlying support structure—usually rafters, joists, trusses, or steel decking.
The combination of these various materials provides strength against wind uplift and lateral pressures while also providing insulation benefits that can minimize energy costs associated with heating and cooling a building.
What Is The Purpose Of Roof Sheathing
Roof sheathing serves several purposes. It helps strengthen the roof, prevent leaks, provide support for the roof, and prevent fires. It is waterproof, helping to extend the lifespan of a roof and prevent water damage.
The sheathing evenly distributes the weight on the roof, providing added strength and support, and helping to prevent sagging or bowing during heavy snowstorms.
The roof sheathing is also treated with a fire retardant, helping to prevent attic fires. If you have concerns about the condition of your roof, it is recommended to contact a professional roofing company for assistance.
What Is The Most Common Roof Sheathing?
The most common roof sheathing is plywood, which is a type of engineered wood made from thin sheets of wood veneer and oriented strand board, known as OSB.
Plywood is lightweight, and can be nailed or screwed down onto your roof rafters to create a sturdy base for the roofing material to attach to. It also provides an excellent barrier against moisture and rot, making it the preferred choice for many homeowners.
Plywood comes in a range of thicknesses depending on the weight load it will need to support, such as ½-inch or 5/8-inch. OSB (oriented strand board) is another type of engineered wood that is becoming increasingly popular due to its strength and stability; however, it’s not as good at keeping out moisture as plywood — which makes it a less desirable choice, particularly when replacing old sheathing.
