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My Experience with 7/8 Inch Tongue and Groove Plywood

When it comes to building and renovating, the choice of materials plays a crucial role in the project’s success. One material I’ve come to appreciate in my years of DIY projects is 7/8-inch tongue and groove plywood. In this article, I’ll share my insights and experiences with this versatile construction material.

What is 7/8 Inch Tongue and Groove Plywood?

7/8-inch tongue and groove (T&G) plywood is a sturdy and reliable engineered wood product designed for various applications in construction and carpentry. It features a unique tongue and groove edge profile that allows the panels to fit snugly together, creating a strong and stable foundation for flooring, roofing, and more.

How I Discovered the Benefits of 7/8 Inch T&G Plywood

My journey with 7/8-inch tongue and groove plywood began when I decided to add a new subfloor to my home’s second story. I wanted a material that could provide strength and stability while also accommodating the installation of various finished flooring options. After consulting with a professional, we settled on 7/8-inch T&G plywood.

The Advantages of 7/8 Inch T&G Plywood

Through my experiences, I’ve found several advantages of using 7/8-inch tongue and groove plywood:

  1. Strength and Stability: This material provides a robust and stable subfloor or roof deck that can support heavy loads.
  2. Easy Installation: The tongue and groove design simplifies the installation process, reducing the risk of misalignment and ensuring a tight fit.
  3. Versatility: It can be used for a wide range of applications, including subflooring, roof decking, and wall sheathing.
  4. Moisture Resistance: Some 7/8-inch T&G plywood comes with moisture-resistant properties, making it suitable for humid or wet environments.

Now, let’s delve into a step-by-step guide on how to work with 7/8-inch tongue and groove plywood for subfloor installation.

Step-by-Step Guide: Installing 7/8 Inch T&G Plywood Subfloor

Step 1: Preparation

  • Ensure the subfloor framing is level, dry, and clean of any debris.
  • Acclimate the 7/8-inch T&G plywood panels by storing them in the room where they will be installed for at least 48 hours.

Step 2: Layout

  • Start laying the panels with the groove side facing the wall and the tongue side facing outward.
  • Leave a 1/8-inch gap between panels to accommodate expansion and contraction. Stagger the seams for increased stability.

Step 3: Fastening

  • Apply construction adhesive to the subfloor framing before placing the panels.
  • Nail or screw the plywood to the framing according to the manufacturer’s recommendations.

Step 4: Inspection

  • Thoroughly inspect the installed subfloor for any gaps, raised edges, or imperfections.
  • Address any issues before moving on to the installation of the finished flooring.

FAQs About 7/8 Inch T&G Plywood

Q1: Can I use 7/8-inch tongue and groove plywoods for roofing applications?

Yes, 7/8-inch T&G plywood is suitable for roofing applications, providing a strong and reliable roof deck. Be sure to check with local building codes and regulations for specific requirements.

Using 7/8-inch tongue and groove (T&G) plywood for roofing applications is generally not a common practice. Roof sheathing typically requires materials that are specifically designed for the purpose, and 7/8-inch T&G plywood may not meet the typical standards or requirements for roof sheathing. Here are some important considerations:

  1. Thickness: While 7/8-inch plywood is relatively thick, roof sheathing materials are usually 1/2-inch or 5/8-inch thick. Thicker materials can add unnecessary weight to the roof structure and may not provide additional benefits in terms of strength or insulation.
  2. Standard Roof Sheathing: Most roof sheathing used in residential and commercial construction is designed to be lightweight, yet strong and rigid. Common roof sheathing materials include 1/2-inch or 5/8-inch plywood or OSB (oriented strand board).
  3. Load-Bearing Capacity: Roof sheathing must be capable of supporting the weight of roofing materials, including shingles, tiles, or other roofing products, as well as any anticipated snow loads. Using excessively thick sheathing can create additional dead load on the structure.
  4. Cost: 7/8-inch T&G plywood is typically more expensive than standard roof sheathing materials, which can significantly increase the cost of the roofing project without offering substantial benefits.
  5. Compatibility: Roofing underlayment, flashing, and other roofing components are designed to work with standard roof sheathing materials. Using non-standard materials can lead to compatibility issues.

If you’re considering using 7/8-inch T&G plywood for a specific roofing project, it’s essential to consult with a structural engineer or roofing professional to determine whether it is suitable for your particular application. They can evaluate your specific requirements, such as roof pitch, anticipated loads, and local building codes, and provide guidance on the most appropriate roofing materials for your project.

Q2: Is it necessary to apply a vapor barrier when using 7/8-inch T&G plywood in a bathroom?

If you’re using moisture-resistant 7/8-inch T&G plywood, it may not require a separate vapor barrier. However, for added protection, consult with the manufacturer’s recommendations.

Q3: Can I install hardwood flooring directly on top of 7/8-inch tongue and groove plywoods subfloor?

Yes, 7/8-inch T&G plywood provides an excellent foundation for hardwood flooring. Make sure the subfloor is clean, level, and dry before installing the hardwood.

Q4: Where can I purchase 7/8-inch tongue and groove plywood?

You can find 7/8-inch T&G plywood at local lumberyards, home improvement stores, and online retailers. Ensure you choose high-quality, certified materials for your projects.

Q5: What is the weight limit that 7/8-inch T&G plywood can support for a subfloor?

The weight limit of 7/8-inch T&G plywood depends on various factors, including the spacing of the joists or framing underneath. Consult with a structural engineer or the manufacturer for specific weight load guidelines.


In conclusion, 7/8-inch tongue and groove plywoods is a versatile and reliable material that I’ve come to trust in my construction and renovation projects. Its strength, stability, and ease of installation make it an excellent choice for creating a solid foundation for various applications.

For more information on 7/8-inch tongue and groove plywoodS and other wood products, explore CN-Plywood’s product page on HPL Birch Plywood and Caravan Thin Plywood.

I hope that my experiences and insights have provided you with valuable guidance for your construction or renovation projects. Tongue and groove plywood is a dependable material that can help you achieve your building goals with confidence.

Post time: 14 10 月, 2023

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