Most residential roofs are made up of numerous components, not just the shingles visible from above. This combination of materials contributes to the structural integrity, waterproofing, and overall protection of your home’s understructure. The decking is perhaps the most important component of your roof’s structure. The roof deck is not visible from the top of your house, but it is one of the most important components to maintain because it is the foundation of the entire roof system.
What Exactly Is Roof Decking?
Roof decking, also known as roof sheathing, is the lowest layer of the roof structure. It is typically made of wooden boards. This is the material that is placed over the structure to create the actual roof when your home is being built.
The roof decking is where the other components of your roof system, such as the underlayment and shingles, attach. This area of the roof must be kept in the best possible condition for a variety of reasons.
What are the most common materials used in roof decking?
Roof decking comes in two varieties that are commonly used on residential properties. The first is known as plank decking. Prior to the development of plywood, most roofs used plank decking because it was inexpensive and functional. Plank decking is typically constructed of long, rectangular wooden boards. The majority are 1 x 6 or 1 x 8 in size. If your house is older, plank decking may still be used beneath it. Typically, wood flooring boards are laid one on top of the other.
The more common option is sheet decking. This type of roofing decking, also known as sheathing, is made of flat sheets of wood. On roofs, one of two types of sheet decking is commonly used.
The first is known as OSB, or oriented standard board. This is the most common type found on most residential roofs. The sheet is constructed from compressed wood strips and pieces. They are usually 7/16″ thick and sold as a flat sheet that is placed on the surface. This type of sheet decking is more affordable, which is why it is commonly used.
Plywood is the second option. It comes in a variety of thicknesses ranging from 3/8″ to 34″ thick. Your roofer will select the appropriate size based on the span of the rafters on your home. Plywood is widely used in many homes and is readily available for most applications. However, it is typically more expensive than OSB.
What Purpose Does Roof Decking Serve?
Roof decking is your home’s protective structure. These roof pieces contribute to the roof structure of the property. That is, it effectively keeps moisture out. It aids in reducing energy loss. It also protects other items in your home from the elements. It is an essential part of your entire roofing system.
Also, keep in mind that roof decking is necessary for constructing a sturdy, dependable structure on which to install roofing material. This could include shingles, metal roofs, or any other materials you prefer. If the foundation is in poor condition, it may indicate that the entire roof system is not long-lasting and dependable.
How Long Does Roof Decking Last?
Most roofs have a lifespan of about 20 years, though some can last much longer. Roof decking, on the other hand, can often last much longer. These wood components could last 100 years or more, depending on the quality and how well they are maintained. The key is upkeep and maintenance. If the roof decking becomes exposed, being able to make repairs quickly is critical to preserving this lifetime.
When Should Roof Decking Be Replaced?
Given the significance of a well-maintained roof deck, the question is, how do you know if it is protected? This can be difficult to notice, especially if you are not a trained professional. That is why an annual roof inspection is one of the best things you can do to preserve this area. Your roofer will be able to detect shingle damage that may expose the roof decking.
Here are a few more common indications that the roof decking needs to be replaced:
- There are some leaks. If you have leaks in your attic or home, there’s a good chance the roof decking has been damaged. Typically, the decking is covered with a paper or plastic covering that keeps water out. Leaks indicate that it is not functioning properly.
- Ceiling stains on the inside. An active leak may go undetected. However, there may be areas where there are stains on the ceiling surface that indicate a leak. If you notice any type of discoloration on the ceiling in the home’s upper floors, this could be an indication of damaged decking.
- Mold or mildew in the attic. Mold or mildew may also be present in the attic, particularly in the upper portion of the space. If you notice this, or if the attic insulation has water damage, the roofing structure is leaking.
- The roof is sagging. If you look at the roof structure (from the outside or inside the attic) and notice any sagging, this could indicate the presence of roof decking damage. The wood may become water-saturated, causing the entire structure to sag. This necessitates immediate repairs.
Any damage to the roof means the decking’s structure is jeopardized. This could be due to hail, a tree falling on the roof, or missing shingles. It is critical to recognize the signs of roof decking damage. The sooner you seek assistance, the sooner you can protect your home from danger, including costly damage from a collapsed ceiling.
