Roof Decking

Roof Decking

We understand that getting a new roof can be stressful, which is why we are dedicated to providing you with the best possible customer service.


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New Jersey licensed roofers

The roof of your house is much more than the shingles that are visible. Your roof is a combination of materials and components that, in totality, protect your home from the weather and elements outside. There are layers of materials that form a complete and properly functioning roof. One of the most important layers is the roof decking; it is the foundation for the entire roof system.

When you need a roof repair or replacement, you can count on our team of licensed roofers in New Jersey to deliver a high-quality roof that lasts for years. Allied Roofing Solutions has provided residential replacement services since 2007. We are experts in all components necessary for roof repair and replacement. Call us  (201) 773-0633.

Roof decking is made up of wooden boards

What is Roof Decking?

Roof decking is made up of wooden boards that create the framing of the roof. It is the foundation portion of the roof system. Much like the foundation of the house is the load-bearing part of the house, the roof decking is the load-bearing part of the roof system. Roof decking is a layer of material installed over the roof’s framing, providing a flat and level surface for the roofing materials to be applied onto. The roof decking functions as a structural foundation for the entire roof and supports the weight of the roof in addition to loads such as snow and wind. The roof decking also creates a firm, stable platform for roofers to work on while installing the roof.

components of the roofing system

Why is Roof Decking Important?

The roof decking isn’t visible from outside because it is underneath the other roofing components. After a wooden frame is built and the decking is placed, the other components of the roofing system are installed on top of it. Each part is layered on top of the previous one. Being the bottom layer, the roof decking provides the base that creates the overall health of the entire roofing system. If the roof decking isn’t in good shape, the rest of the roof will be substandard.

Types of Roof Decking

There are three types of roof decking used in residential homes: 1) plywood, 2) CDX plywood, and 3) OSB.

Plywood made from thin layers of wood

Plywood Roof Decking

Plywood is made from thin layers of wood veneer plank that are glued together and is a strong, durable, and lightweight material. It is available in a range of grades, from high-quality panels with a smooth surface to lower-grade panels with visible knots and other imperfections. Plywood is a popular choice for roof decking because of its qualities.

CDX is a type of plywood

CDX Roof Decking

CDX is a type of plywood that is commonly used for roof decks. CDX stands for “C-D Exposure 1.” This indicates that the plywood has a C-grade front veneer and a D-grade back veneer and is designed for use in applications where it is exposed to some moisture but not directly exposed to the elements. CDX plywood roof decking is an affordable, durable, and versatile option used in residential roofing.

OSB plywood

OSB Roof Decking

OSB (Oriented Strand Board) is the most common type of decking used on roofs today. OSB is made by compressing and gluing together strands of wood planks that are arranged in alternating layers to create a strong, durable panel. OSB roof decking is available in a range of thicknesses and grades, making it versatile and customizable to suit the specific needs of the house.

Most Common Reason Roof Decking Needs To Be Replaced

Replace the roof decking

When you are having your roof replaced, you may need to replace the roof decking. Since the roof decking is underneath the shingles, it is difficult to tell its condition until the old roof has been removed. If there is any damage to the roof decking and its integrity is compromised from rotting, the decking will need to be replaced. Usually, there will be some boards that must be changed out; however, we won’t know how much needs to be replaced until after tearing off the old roof. At Allied Roofing Solutions, if we find rotting boards, then we replace the decking before beginning to install the other roofing components. If we don’t find any damage to the roof decking, we can use it and proceed with putting the shingles on.

Frequently Asked Questions about Roof Decking

When Should I Replace My Roof Decking?

Whether the decking for the roof should be replaced or not is dependent on the integrity of the decking system. Keep in mind that the decking is the structural basis for the entire roof system. The roof decking must be replaced when there has been moisture damage, rot, holes or cracks, shrinkage, warping, or other decking inconsistencies.

You may not have to put new roof decking on when you repair or replace the roof on your house. Yet, a repair or new roof installation is the prime time to inspect the decking to verify that it is in excellent condition. If there is no water damage or other damage to the roof decking, it won’t need to be replaced. If there are damage and integrity issues with the roof decking, you need to replace it. A compromised decking won’t securely hold shingle nails and will result in loose shingles. Over time, this will lead to leaks, having shingles blow off, and structural damage to your home due to moisture infiltration.

Roofing contractors can’t always predict whether the roof decking needs to be replaced before tearing off the old roof. Why? Because the roof deck is below the shingles and other roofing materials and it isn’t visible from the exterior. If moisture has infiltrated through loose shingles and weakened the decking, we will need to solve the problem before installing the new roofing components on top of it. Otherwise, putting a new roof over a damaged decking means that your roof is vulnerable to weather and the elements.

Understanding how the damage occurred and what the plan is to get a solidly functioning roof is important. Here are some questions to ask.

  • What is the damage and how was it caused?
  • Has there been damage to other parts of the house from the decking being compromised?
  • What material will you use to replace the current decking?
  • What are the pros and cons of the material you are recommending?
  • Do I need attic ventilation?
  • How will repairing and/or replacing the roof decking affect my quote?

Contact Allied Roofing Solutions for Repairing or Replacing Your Roof

Your trusted roofing company in New Jersey, Allied Roofing Solutions, ensures a durable, top-quality roof that will last for decades. If you believe your roof decking is compromised and need a new roof for your home, contact Allied Roofing Solutions. We proudly offer residential roofing services in the following areas: Bergen County, Essex County, Hudson County, Middlesex County, Morris County, Passaic County, and Somerset County. To schedule a free roof inspection, please call us at  (201) 773-0633 or fill out our handy free estimate form.

New jersey Roofing Company

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