In this article, we will explore whether it is possible and the factors to consider before making a decision.
Understanding a Plywood Subfloor:
A plywood subfloor refers to an additional layer of wood that is installed over the existing floor. Its purpose is to provide a stable and even surface for the new flooring installation. Plywood is commonly used as it is strong, durable, and resistant to moisture, making it an ideal choice for subflooring.
Things to Consider:
1. Height and Threshold:
One of the crucial factors to consider is the change in height between your existing hardwood floor and the proposed new flooring. Installing a plywood subfloor can raise the overall height of the floor, potentially creating a noticeable difference at thresholds and transitions. This could pose a tripping hazard and might not be aesthetically pleasing. It is essential to evaluate the practicality of such a change and how it will impact the overall look of your space.
2. Doors and Trim:
Installing a plywood subfloor over an existing hardwood floor can also affect the alignment of doors and the placement of trim. The additional height can impede the swing of doors and require adjustments to ensure proper functionality. Similarly, the base trim along the walls might need to be adjusted to accommodate the difference in floor height. These considerations should not be overlooked when deciding whether to proceed with a plywood subfloor installation.
3. Moisture and Air Circulation:
Unlike hardwood flooring, plywood is susceptible to moisture damage. Before installing a plywood subfloor over an existing hardwood floor, it is crucial to assess the moisture levels in the space and ensure proper ventilation. Moisture trapped between the two layers of flooring can lead to mold and rot, compromising the structural integrity of the subfloor and the new flooring. Adequate air circulation and moisture mitigation measures must be in place to prevent potential damage.
Installation Process:
1. Prepare the Existing Hardwood Floor:
Before installing the plywood subfloor, it is necessary to prepare the existing hardwood floor. This involves thoroughly cleaning the surface, removing any loose boards or protruding nails, and ensuring a level and smooth base for the subfloor.
2. Measure and Cut Plywood Panels:
Measure out the dimensions of the room and cut the plywood panels accordingly, leaving space for expansion gaps around the perimeter. The panels should fit snugly together, with joints staggered to enhance stability.
3. Attach Plywood Panels:
Securely attach the plywood panels to the existing hardwood floor using construction adhesive and nails or screws. Make sure to follow the manufacturer’s guidelines for installation and spacing of fasteners.
4. Seal and Level:
After the plywood subfloor is installed, sealing and leveling the surface is important. Use a suitable floor leveling compound to fill any gaps or imperfections, ensuring a smooth and even subfloor for the new flooring.
While it is technically possible to install a plywood subfloor over an existing hardwood floor, it is essential to carefully consider the practicality, aesthetics, and potential issues that may arise. The change in height, impact on doors and trim, as well as the dangers of moisture damage, must all be taken into account before proceeding. Consulting with a professional contractor or flooring expert is highly recommended to ensure a successful and durable installation.