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The Daily Insight

Is plywood OK in bathroom

Author

Emma Valentine

Published Feb 27, 2026

Plywood is the most common material used for subflooring in bathrooms. A versatile, man-made material, plywood is used in floors, walls and furniture. When embarking on bathroom renovations, the material chosen for the subflooring is critical.

Is it OK to use plywood instead of drywall?

Plywood is a viable alternative to drywall for walls and ceilings. If you are planning on redoing your walls or ceilings, the typical materials you’ll use include Sheetrock or finished plywood. Each has its benefits as a building material and in some cases, finished plywood is the better alternative.

Do I need marine plywood for bathroom?

Using marine grade plywood can offer a different aesthetic than the standard materials used in bathrooms. It will also withstand the high moisture environment that comes from the shower and sink. Using it for flooring or a sink backsplash means you won’t be taking any chances with rot or mold in your bathroom.

What is best subfloor for bathroom?

Plywood or enhanced plywood is going to be the best option for your bathroom subfloor. Although they are more expensive than OSB, they still hold up better in high-moisture areas.

Can you use OSB board in a shower?

Even if you buy OSB that is waterproof from the market, you should apply an additional layer of waterproofing for protecting the board from moisture or water. … OSB is more water-resistant than plywood. So, OSB can be used for both indoor and outdoor projects.

Does plywood help insulation?

Is plywood good insulation? The short answer is “no,” at least, not compared with products designed to provide insulation from cold and heat. Even so, plywood products do offer minimal R value, along with structural benefits.

Is plywood a good sound barrier?

Plywood offers some soundproofing characteristics, but not as good as drywall. Sound travels through wood very easily and when used by itself, plywood does not make for a good soundproofing material. … Overall, plywood can be used to help with soundproofing but will not provide as much soundproofing as drywall will.

Can you install a tub surround over plywood?

Tip: Glue-up shower stalls and kits should only be installed over moisture-resistant drywall or another similar solid surface like cement board. They’re not recommended for use over existing tile, plywood or wallpaper.

What is a cheap alternative to drywall?

Plywood is the cheapest alternative to drywall on this list and allows you to finish a room with a certain flair without taking on the expenses of wood planks, veneer or drywall.

What is the best way to waterproof a shower?

In general, liquid waterproof membranes can be applied by homeowners for a simple, quick, and cost-effective way to waterproof your shower. If you are looking for a more robust and longer-term solution, opting for some sheet membrane or foam backer board is probably your best bet.

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What is the best backer board to use in a shower?

Cement board is a good, reliable backer board that works well on both floors and walls. Keep in mind that most tile setters err on the side of caution and brush a waterproofing membrane on top of cement board when it is in wet areas like showers or tub surrounds.

Can I use regular plywood for subfloor?

Standard plywood can be used for subfloors, but it is more common to use tongue-and-groove sheets that interlock along the edges. The recommended thickness of the plywood subfloor is governed by the spacing of the joists. … The type of OSB used for subfloors generally is made with tongue-and-groove edges (T & G).

How thick should subfloor be in bathroom?

The installation guide for 1/4 inch HardieBacker recommends having wood subfloors made of 5/8 inch exterior grade plywood or OSB (oriented strand board) that is 23/32 inches thick.

Is underlayment plywood waterproof?

Underlayments help to provide extra support to the actual floor. While there are different types of subfloors, the most common type is made from plywood. This is because it is straight, flat and relatively strong. It is also cheap and while it is not waterproof, it can resist sharp changes in humidity.

What type of plywood is used for bathroom subfloor?

Traditionally, exterior grade plywood has been the subfloor material of choice for many bathroom flooring projects. Plywood is made by gluing alternating layers of wood veneer. CDX plywood (¾”) in particular is used often because it has a high level of resistance to moisture and humidity.

Is 12mm plywood OK for flooring?

The cross-graining technique used in our 12mm ply improves strength, stability and prevents warping, making it excellent for bath panelling, wall lining floors and roofs. …

Is cement board as strong as plywood?

If you compare the two configurations using identical thinset mortars, tiles installed over cement backerboard have greater shear-bond strength than those that are installed over plywood. …

How do you waterproof a bathroom subfloor?

Caulk any seams where two pieces of plywood are butted together. Dab caulk onto nail or screw heads to seal the potential leak point they provide. Caulk any splits in the wood or any other areas that may provide a point for water to seep under the subfloor.

Can I tile over plywood on a bathroom floor?

Tile can be laid on plywood. But do not install tile directly on the plywood subfloor itself. Use an intervening layer of a sheet of thinner plywood.

Does sound travel through plywood?

Plywood is the least effective since sound transfers quickly through the wood. OSB and MDF have similar soundproofing characteristics as drywall, but they have other drawbacks that make them a less optimal choice in many situations. … None of these materials on their own will be soundproof.

Is plywood sound absorbing?

Since sound in air is energy in motion, sound waves may be absorbed by a surface or reflected. Plywood, like other materials, will absorb some of the sound energy and reflect the remainder.

Can you soundproof a plywood wall?

Soundproofing plywood walls is possible and there are several ways to do it. You can either use soundproof or foam wallpaper, acoustic foam panels, soundproof paint, and fiberglass panels. … Plywood walls are thinner than concrete. For this reason, they cannot prevent much noise from entering your home.

What are disadvantages of plywood?

  • It is more expensive than Medium Density Fiberboard (MDF).
  • Because the layers of veneers are seen at the edges, edges have to be finished either with laminate or veneer.
  • It often get splinter from the edges during transportation.
  • It is quite difficult to cut.

Does plywood hold heat?

Plywood and wood expand upon heating as do practically all known solids. … The average coefficient of linear thermal expansion is about 3.4 x 10-6 inch/inch per degree F for a plywood panel with 60 percent of the plies or less running perpendicular to the face.

Is plywood walls cheaper than drywall?

Plywood panels almost always require the whole portion of the wall to be repaired for the right look. … Drywall is cheaper than plywood – Most wood materials are expensive. Plywood is no exception. While it is not as expensive as regular wood, it is slightly more expensive than drywall.

What type of plywood is used for interior walls?

When we talk about plywood walls, we often use the term “paneled walls.” This refers to thin, inexpensive wood paneling, which is often printed to look like wood grain. However, we can also use finer grade plywood, such as ½” or ¾” cabinet grade plywood as wall covering as well.

What can I use for a tub surround?

In some bathrooms, the surround can include virtually all wall surfaces. Although typically made of ceramic tile, other materials can also be used for bathtub surrounds, including sheets of acrylic or polyester, or sheets of solid-surface material.

How much does it cost to install a tub surround?

Cost To Install Tub Surround The average cost to install a tub surround is $600 to $1,800 for the materials and labor. The labor cost to replace a tub surround is $300 to $600. Basic acrylic and fiberglass tub surrounds cost $200 to $1,000, while solid surface surrounds cost $600 to $2,000, plus installation.

What can I use behind my shower surround?

Use an appropriate waterproof or moisture-resistant backing material behind grouted tile or stone or segmented plastic or fiberglass tub and shower surrounds. Appropriate materials include cement board which has a cementitious core and glass mats on both sides to strengthen the board.

Does grout sealer make it waterproof?

Sealer soaks into the grout and supposedly makes your tile and grout waterproof. People who want to sell you grout sealer will tell you it keeps it easier to clean, and helps prevent mildew from growing.

How do you waterproof a drywall shower?

The best way to waterproof your drywall is to use a waterproofing primer. You can find both oil- and latex-based waterproofing primers made by most paint manufacturers. These products are created specifically to prevent mold and mildew on the surface to which they are applied.