Plywood Basics for Bathroom Flooring
Plywood is a popular choice for bathroom flooring because it is strong, durable, and relatively inexpensive. It is also available in a variety of thicknesses and finishes, making it a versatile material for any bathroom project. However, not all plywood is created equal. Some types of plywood are better suited for bathroom applications than others.
Types of Plywood for Bathroom Flooring
The type of plywood you choose for your bathroom floor will depend on your budget, the level of moisture resistance you need, and the overall style of your bathroom.
- Sanded plywood: Sanded plywood is the most common type of plywood used for flooring. It is made from thin layers of wood veneer that are glued together with the grain running in alternating directions. This construction makes sanded plywood strong and stable. However, sanded plywood is not moisture-resistant and should not be used in bathrooms.
- Sheathing plywood: Sheathing plywood is another common type of plywood that is often used for subfloors. It is typically made from softwood veneers and is less expensive than sanded plywood. However, sheathing plywood is also not moisture-resistant and should not be used in bathrooms.
- Exterior plywood: Exterior plywood is made from veneers that are treated with a moisture-resistant resin. This makes exterior plywood a good choice for bathroom floors. However, exterior plywood is typically more expensive than sanded or sheathing plywood.
- Marine plywood: Marine plywood is the most moisture-resistant type of plywood available. It is made from veneers that are treated with a waterproof resin and is often used for boat building. Marine plywood is very expensive, but it is the best choice for bathroom floors if you are looking for the most durable and moisture-resistant option.
Moisture-Resistant Plywood
Moisture-resistant plywood is essential for bathroom floors because bathrooms are prone to moisture buildup. When water seeps into plywood, it can cause the wood to warp, rot, and eventually fail. This can lead to expensive repairs and even structural damage. Moisture-resistant plywood is treated with a special resin that makes it more resistant to water damage. This resin helps to prevent water from penetrating the plywood and causing damage.
Cost and Availability
The cost of plywood for bathroom floors varies depending on the type of plywood you choose. Sanded plywood is the least expensive option, while marine plywood is the most expensive. The availability of plywood also varies depending on your location. However, all types of plywood are readily available at most home improvement stores.
Preparation and Installation
Getting your bathroom floor ready for plywood is a crucial step for a successful and long-lasting installation. It ensures a smooth and even surface, prevents moisture damage, and provides a solid foundation for your tiles.
Preparing the Subfloor
Properly preparing the subfloor is essential for a successful plywood installation. This involves leveling the surface, ensuring adequate moisture control, and addressing any existing issues.
- Leveling the Subfloor: Uneven subfloors can lead to uneven tiles and potential cracking. Use a level to check for inconsistencies and address them with a self-leveling compound or shims.
- Moisture Control: Bathrooms are prone to moisture, making it crucial to control moisture levels. Install a moisture barrier like a polyethylene sheet or a vapor retarder between the subfloor and the plywood.
- Addressing Existing Issues: Before installing plywood, inspect the subfloor for any damaged or rotted areas. Repair or replace these sections to prevent future problems.
Installing Plywood Sheets
Once the subfloor is prepared, you can install the plywood sheets. This involves proper spacing, securing techniques, and using appropriate adhesives and sealants.
- Spacing: To prevent warping and ensure proper support, leave a gap of 1/8 inch between plywood sheets. This allows for expansion and contraction due to temperature changes.
- Securing Techniques: Secure the plywood sheets to the subfloor using screws or nails. Ensure the fasteners are long enough to penetrate the subfloor and plywood by at least 1 1/2 inches.
- Waterproof Adhesives and Sealants: Using waterproof adhesives and sealants is essential for plywood installation in bathrooms. This helps prevent moisture from penetrating the plywood and causing damage.
Tiling Considerations: Plywood For Tiling Bathroom Floors
When tiling directly on plywood, it’s essential to choose the right tile type and employ proper techniques to ensure a durable and waterproof installation. Understanding the compatibility of various tiles with plywood subfloors and mastering the art of tiling directly on plywood are crucial for a successful bathroom flooring project.
Tile Compatibility with Plywood Subfloors
The compatibility of different tile types with plywood subfloors depends on factors like tile size, weight, and the type of plywood used.
- Ceramic and Porcelain Tiles: These tiles are generally compatible with plywood subfloors, but it’s crucial to ensure the plywood is adequately thick and strong enough to support their weight. For large-format tiles, thicker plywood (at least 5/8 inch) is recommended.
- Natural Stone Tiles: Natural stone tiles, like marble, granite, and slate, are heavier than ceramic or porcelain tiles. Therefore, using thicker plywood (at least 3/4 inch) and reinforcing the subfloor with additional support is often necessary.
- Glass Tiles: Glass tiles are lightweight and generally compatible with plywood subfloors. However, it’s important to ensure the plywood is smooth and free from any imperfections to prevent the tiles from cracking.
Tiling Techniques for Plywood Subfloors, Plywood for tiling bathroom floors
Tiling directly on plywood requires careful preparation and the use of appropriate materials and techniques.
- Surface Preparation: The plywood subfloor must be clean, smooth, and free from any debris, dust, or imperfections. It’s crucial to ensure the plywood is adequately supported and free from any movement or flexing.
- Moisture Barrier: Applying a moisture barrier is essential to prevent moisture from penetrating the plywood and causing damage. A waterproof membrane or a layer of paint-on sealant can be used for this purpose.
- Thin-Set Mortar: Thin-set mortar is the adhesive used to bond the tiles to the plywood subfloor. It’s important to choose a thin-set mortar specifically designed for use with plywood and suitable for the type of tiles being installed.
- Grout: Grout is used to fill the gaps between the tiles, creating a watertight seal. Choose a grout that complements the tile color and is compatible with the thin-set mortar used.
- Tile Backer Boards: Tile backer boards, like cement board or fiberglass-reinforced cement board, can be used as an additional layer of protection and support for the tile installation. They provide a more rigid and waterproof surface for the tiles, particularly in areas prone to moisture, like showers and tubs.
