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Redecking A Roof: Everything You Need To Know

The roof is an integral part of any home, providing shelter and protection from the elements. While we often focus on the shingles and flashing, it’s essential not to overlook the importance of the roof deck.

The roof deck is the foundation upon which the roofing materials are installed. Over time, it can deteriorate and require replacement. In this comprehensive guide, we will help you understand:

What a roof deck is

  • Signs that indicate the need for redecking
  • The costs involved
  • Redecking a roof step by step

If you think is time to replace roof decking on your home, keep reading to learn everything you need to know!

What is a Roof Deck?

close up to roof decking process

Before diving into the redecking process, let’s understand what a roof deck is and its significance.

The roof deck, also known as roof sheathing or roof decking, is the structural foundation that supports the roofing materials such as shingles or tiles. It is typically made of plywood or oriented strand board (OSB) and is attached to the rafters or trusses of your roof.

The roof deck plays a crucial role in the overall integrity of your roof. It distributes the weight of the roofing materials and any potential snow or wind loads evenly across the roof structure. A well-maintained and sturdy roof deck is essential for the longevity and performance of your roof.

Signs You Need to Replace Your Roof Decking

Over time, a roof deck can deteriorate due to various factors, including moisture, age, and exposure to the elements. It’s essential to keep an eye out for signs that indicate the need for redecking. Ignoring these signs can lead to more significant issues down the line. Here are some common indicators that your roof deck may need replacement:

  • Sagging or Uneven Roof: If you notice dips, sags, or an uneven appearance on your roofline, it could be a sign of a deteriorating roof deck. These structural issues can compromise the integrity of your entire roof.
  • Water Damage: Water stains on your interior ceilings or walls are a clear indication of roof leaks. If your roof deck has weakened due to moisture infiltration, it’s time for redecking.
  • Rotting or Soft Spots: Walk on your roof carefully, and if you encounter soft, spongy areas or visible rot, your roof deck is likely compromised and needs replacement.
  • Excessive Moisture: Mold or mildew growth in your attic or under the roof can be a sign of excessive moisture due to a deteriorating roof deck.
  • Old Age: The lifespan of a roof deck can vary depending on the material used and local climate conditions. However, if your roof is over 20-30 years old, it’s advisable to inspect the deck for signs of wear and tear.
  • Missing or Damaged Shingles: If you frequently experience missing, cracked, or curled shingles, it may be an indicator that the roof deck underneath is no longer providing a stable base for your roofing materials.

How Much Does it Cost to Redeck a Roof?

The cost of redecking a roof can vary significantly based on several factors, including the size of your roof, the material you choose for the new deck, and the extent of any necessary repairs. On average, you can expect to pay between $2,500 to $7,500 for redecking a standard-sized roof. Here’s a breakdown of the main cost factors:

  • Roof Size: The larger your roof, the more materials and labor will be required, which will increase the overall cost.
  • Decking Material: Plywood is a common choice for roof decking due to its durability and stability. The cost of the decking material will depend on the type and thickness you choose.
  • Repairs and Modifications: If there is extensive damage to the existing roof deck or if modifications are needed to meet current building codes, these additional expenses will add to the overall cost.
  • Labor Costs: Labor costs can vary depending on your location and the complexity of the job. Professional installation is crucial for a safe and long-lasting result.
  • Roof Pitch and Accessibility: Steeper roofs or roofs with limited accessibility may require more labor and equipment, impacting the overall cost.

It’s essential to obtain multiple quotes from reputable roofing contractors to get a better estimate tailored to your specific situation.

8 Steps to Redeck a Roof

Redecking a roof is a complex process that requires careful planning and execution. It’s a job best left to experienced professionals, but understanding the general steps involved can help you make informed decisions and oversee the project effectively.

1) Inspection and Assessment 🔎

A thorough inspection of the existing roof deck is conducted to identify any issues or damage. The extent of damage and the need for repairs or replacements are assessed.

2) Preparation ✍️

Remove the existing roofing materials, such as shingles, underlayment, and flashing. Any damaged or rotted sections of the roof deck are removed and replaced. Ensure proper ventilation and insulation, if necessary, to meet building code requirements.

3) Material Selection 🧱

Choose the appropriate decking material, typically plywood or OSB, of the correct thickness. Ensure the decking material is compatible with your local climate and roofing materials.

4) Installation 🔨

new house construction roof decking view

The new decking material is installed over the entire roof surface, attaching it securely to the rafters or trusses. Use the correct fasteners and spacing as specified by local building codes. Seam any joints properly, and stagger the decking panels to avoid weak points.

5) Underlayment and Flashing 💦

Install a waterproof underlayment over the decking to provide an additional layer of protection against moisture infiltration. Properly install flashing around roof penetrations, such as vents, chimneys, and skylights.

6) Roofing Materials ⚒️

Once the deck is in place, reinstall your chosen roofing materials, such as shingles, tiles, or metal panels, following manufacturer guidelines. Ensure that the roofing materials are installed correctly to prevent future issues.

7) Clean-Up and Inspection 🧹

Clean the work area thoroughly, removing any debris or leftover materials. Inspect the newly redecked roof to ensure it meets all safety and quality standards.

8) Final Inspection and Maintenance 👷

Have a professional roofing inspector check the redecked roof to ensure it meets local building codes and standards. Regularly maintain your roof to extend its lifespan and prevent future issues.

Work With a Professional Roofing Contractor

Redecking a roof is a significant investment in the long-term health and durability of your home. A solid roof deck is essential for supporting your roofing materials and protecting your interior from the elements. By understanding the signs that indicate the need for redecking, estimating the cost, and knowing the steps involved in the process, you can make informed decisions to ensure the safety and longevity of your roof.

Working with a qualified roofing contractor is key when it comes time to build a roofing system that is designed to last. When you want a team you can trust with your roof decking, call on Greentek Roofing. Contact us today to get an estimate for your roof decking project. 


“GreenTek was awesome to work with. My rep James was easy to get in contact with and answered all my questions and made the process quick and smooth. The roof came out great and everything was finished on time and they handled everything with my insurance company so I didn’t have to. It made the process stress free for me.”

-Dylan O.

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