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My Journey with 1 1/8 Tongue and Groove Subfloor

When embarking on a home renovation or construction project, one crucial element that often goes unnoticed but plays a significant role in your home’s stability and comfort is the subfloor. In this extensive guide, I’ll take you on a journey through the world of 1 1/8 tongue and groove subfloor, sharing my experiences and knowledge about this essential component of any building project.

What is 1 1/8 Tongue and Groove Subfloor?

1 1/8 tongue and groove subfloor, often referred to as 1 1/8 T&G subfloor, is a specific type of subflooring material. It’s made from sheets of wood that are precisely cut and designed to interlock, thanks to the tongue and groove (T&G) edges. These interlocking edges create a strong and stable foundation for your finished flooring material, whether it’s hardwood, tile, or carpet.

My Personal Experience

I first encountered 1 1/8 tongue and groove subfloors during a home renovation project. The subfloor of the old house was in dire need of replacement, and after doing some research, I found that 1 1/8 T&G subfloor was the ideal choice.

How to use Tongue and Groove Subfloors?

Tongue and groove (T&G) subflooring is a common choice for creating a strong, stable, and seamless base for various types of flooring materials. Here’s how to use tongue and groove subflooring:

Materials and Tools:

  1. Tongue and groove subfloor panels (typically made of plywood or OSB)
  2. Measuring tape
  3. Circular saw or jigsaw
  4. Screws or nails
  5. Screwdriver or nail gun
  6. Safety goggles and ear protection
  7. Construction adhesive (optional)
  8. Chalk line (optional)
  9. Level
  10. Carpenter’s square


  1. Preparation:
    • Ensure the existing floor framing or joists are level and free from any protrusions or irregularities. Repair or shim any areas that are not level.
    • If you’re installing subflooring over an existing subfloor, make sure it’s clean and in good condition.
  2. Acclimation:
    • If the subfloor panels have been stored in a different environment, let them acclimate to the room’s temperature and humidity for at least 48 hours before installation.
  3. Measure and Plan:
    • Measure the room and calculate the number of subfloor panels you’ll need. Plan your layout so that the panels are oriented perpendicular to the floor joists. Stagger the seams between rows to create a more stable subfloor.
  4. Cutting:
    • If you need to cut panels to fit the edges of the room, measure and mark the cut lines using a chalk line, straightedge, and pencil. Use a circular saw or jigsaw to make the cuts. Wear safety goggles and ear protection while cutting.
  5. Installation:
    • Start in one corner of the room. Apply construction adhesive to the top of the floor joists or subfloor, if desired, to enhance the bond between the panels and the framing.
    • Lay the first tongue and groove subfloor panel in place with the groove side facing the wall. The tongue should be facing the center of the room.
    • Ensure that the panel is snugly seated on the joists or subfloor. Use a carpenter’s square and level to check for squareness and level. If the subfloor panel is not level, shim it as needed.
    • Secure the panel by driving screws or nails through the panel and into the floor joists or subfloor, following the manufacturer’s recommendations for fastener spacing.
    • Continue installing the remaining panels in a staggered pattern, ensuring the tongue and groove connections are properly aligned and that each panel is level and securely fastened. Overlap the panels on the joists or subfloor.

The Benefits of 1 1/8 Tongue and Groove Subfloors

Let me share with you the advantages I discovered during my journey with 1 1/8 tongue and groove subfloors:

  1. Exceptional Strength: This subflooring material is incredibly strong and can support the weight of heavy floor coverings and furniture.
  2. Stability: The tongue and groove edges ensure a tight fit between sheets, minimizing the risk of squeaky floors or uneven surfaces.
  3. Easy Installation: Installing 1 1/8 tongue and groove subfloor is relatively straightforward, making it a practical choice for DIY enthusiasts or professionals.
  4. Versatile: It’s suitable for various types of finished flooring, from hardwood and tile to carpet and vinyl.

Now, let’s delve into the step-by-step process of installing 1 1/8 tongue and groove subfloors.

Step-by-Step Guide: Installing 1 1/8 Tongue and Groove Subfloors

Step 1: Preparation

  • Ensure the existing subfloor is clean and level.
  • Check for any damaged or rotten areas and replace them.
  • Acclimate the 1 1/8 T&G subfloor sheets to the room for at least 48 hours to prevent warping.

Step 2: Layout

  • Start laying the sheets along the longest wall.
  • Leave a 1/8-inch gap between the sheets to account for expansion.
  • Stagger the seams for added stability.

Step 3: Fastening

  • Use construction adhesive on the subfloor joists before laying the sheets.
  • Nail or screw the sheets to the joists, following the manufacturer’s recommendations for spacing and fasteners.

Step 4: Reinforcement

  • Add blocking between joists to provide extra support and reduce flex in the subfloor.

Step 5: Inspection

  • Check the subfloor for any gaps or irregularities.
  • Correct any issues before proceeding to the finished flooring installation.

FAQs About 1 1/8 Tongue and Groove Subfloors

Q1: Can 1 1/8 tongue and groove subfloors be used in all areas of the home?

1/8 tongue and groove subfloor is suitable for most areas of the home, but it may not be the best choice for high-moisture spaces like bathrooms. Consider using marine-grade plywood for those areas.

Q2: Do I need professional help to install 1 1/8 tongue and groove subfloors?

While it’s possible to install 1 1/8 tongue and groove subfloors as a DIY project, seeking professional help can ensure a flawless installation, especially in larger or complex projects.

Q3: What is the best finish for a 1 1/8 tongue and groove subfloors?

The choice of finish depends on your preferences and the type of finished flooring you plan to install. Options include paint, stain, or a clear polyurethane sealer.

Q4: Can I install radiant floor heating beneath 1 1/8 tongue and groove subfloors?

Yes, radiant floor heating can be installed beneath 1 1/8 tongue and groove subfloor, providing an energy-efficient and comfortable heating solution.

Q5: Where can I purchase 1 1/8 tongue and groove subfloors sheets?

You can find 1 1/8 tongue and groove subfloors sheets at home improvement stores, lumberyards, and online retailers. Be sure to choose high-quality materials for the best results.


In conclusion, 1 1/8 tongue and grooves subfloor is a fundamental component of your home’s structural integrity and comfort. My personal journey with this material has shown me its exceptional strength, stability, and ease of installation. Whether you’re tackling a DIY project or working with professionals, this subflooring material provides a reliable foundation for your finished flooring.

For more information on 1 1/8 tongue and grooves subfloor and other wood products, please explore CN-Plywood’s product page on HPL Birch Plywood and Caravan Thin Plywood.

I hope my journey with 1 1/8 tongues and groove subfloor has provided you with valuable insights and guidance for your own projects. This often-overlooked component plays a crucial role in the overall quality and longevity of your home’s flooring.

Post time: 14 10 月, 2023

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