Asked by: Casiano Gencheva
hobbies and interests woodworking

What is best subfloor for bathroom?

Last Updated: 28th May, 2020

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Plywood as a Subfloor Material
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.

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In respect to this, how thick should a bathroom subfloor be?

Make Sure Your Subfloor is Structurally Stable 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.

Beside above, what is the best subfloor material? Hardwood flooring: Plywood is the best subfloor for hardwood flooring installation. CDX plywood ranging from 1/2 to 3/4-inch-thick and rated A/C will serve well for any hardwood flooring installation. Tongue-and-groove plywood is available to reduce squeaks and help the subfloor fit together better.

In respect to this, what plywood should I use for bathroom floor?

Tongue-and-groove plywood is manufactured specifically for subfloors. The subfloor rests directly on the floor joists and is the lowest layer of flooring material. Plywood three-quarters inch thick is the most common and the strongest.

Is plywood or OSB better for a subfloor?

The National Tile Contractors Association and the Resilient Floor Covering Institute both recommend plywood for subflooring and underlayment, because it doesn't have the risk of swollen edges that OSB does. Plywood also has a slight advantage in stiffness, which means that subflooring panels need not be quite as thick.

Related Question Answers

Marly Tranche

Professional

How do you redo a bathroom subfloor?

  1. check subfloor to see if areas need to be removed. Remove the Damaged Floor Material.
  2. Add the Support Framing as Needed. Use 2x6 lumber to double or “sister” the existing floor framing and provide a solid base for the new plywood subflooring.
  3. Measure and Cut the Plywood.
  4. secure plywood to joists.

Marisca Durgaryan

Professional

How do you waterproof a bathroom subfloor?

Apply a bead of the silicone caulk around the entire perimeter of the subfloor. Place the angled part of the nozzle flat against the crevice between the subfloor and the bottom of the wall and squeeze the trigger slowly. Move the caulk gun evenly along the crevice to apply a bead of caulk.

Ainize Tschauder

Explainer

Do I need to glue plywood to subfloor?

On the 3/4" subfloor, you have the right idea. Use subfloor adhesive, and screw 8" at edges, 12" in field. For the 1/2" underlayment, ideally, you want to screw every 6" all across the panel. Adhesive will help you here, as the subfloor plywood will have voids in spots that will not hold a fastener.

Dee Bairashevsky

Explainer

Should subfloor be nailed or screwed?

Overall, screws tend to be somewhat more expensive, but like nails, some offer better quality for a higher price. With that said, it's imperative you choose a fastener compatible with your subfloor thickness and material. The quality and correct type of subfloor fastener can literally make or break your floor.

Chadwick Trento

Explainer

Does subfloor go under bathtub?

Flooring repairs can be intimidating, but the subfloor under the tub generally consists of plywood secured over floor joists and is fairly simple to replace -- once you get access to it. The entire tub unit requires removal before subfloor replacement can begin.

Kenna Sielmann

Pundit

Can I put new subfloor over old subfloor?

One of the benefits of removing the old flooring is it allows you the chance to fix any loose subflooring or squeaks by re-securing the main subfloor to the floor joists prior to installing the new flooring. With all that being said though the answer is YES you can install New Wood Flooring over the old.

Souhila Mendiz

Pundit

How many layers of plywood do you need for a subfloor?

There are several methods, including: Floating subfloor: There are two common methods for this. The first is to lay two layers of 3/8-inch plywood over the slab without fastening or gluing them to the slab. One layer is laid, and the second layer is stapled or glued perpendicularly or diagonally over the top.

Mayssa Dermuhl

Pundit

What thickness ply for bathroom floor?

12mm ply (when combined with the thickness of the floor tile and adhesive) can result in a sizeable step into the bathroom, which can represent a trip hazard. You need hundreds of screws to make sure its secured correctly (every 150mm). Plywood is a natural product and can vary in quality.

Nahia Mikhalenkov

Pundit

What plywood is waterproof?

Marine-grade plywood, often simply called marine plywood, is not what it's often claimed to be. That is, it's not waterproof. Since it's not treated with chemicals it is not rot-resistant. However, it is a good-quality, hardwood plywood made with waterproof glue.

Lirios Cascio

Pundit

How thick should Plywood be for flooring?

The thickness of your plywood subfloor depends on the joist spans. The National Wood Flooring Association recommends a minimum plywood panel thickness of 7/8-inch for joist spans of 19.2 to 24 inches, and a minimum plywood panel thickness of 5/8-inch for joist spans of 16 inches or less.

Maraya Vanderstegen

Teacher

Can I lay tile directly on plywood?

While you can lay tile directly over a concrete slab using thin-set adhesive, don't make the mistake of applying tile directly to a plywood subfloor. Even if you use a waterproof underlayment membrane, the floor will still be either 1/4″ or 1/2” higher than the subfloor, plus the thickness of the tile and adhesive.

Miguelina Prina

Teacher

What thickness plywood do I need?

CDX plywood should be a minimum of 7/16 inch thick. The thicknesses are as follows: 7/16-, 15/32- and 1/2-inch-thick panels require joists spaced 16 inches on center; 19/32- and 5/8-inch-thick panels require joists spaced 20 inches on center.

Biel Kamppeter

Teacher

What thickness cement board should I use?

Cement Board Thickness
Cement backer board comes in two standard thicknesses, 1/2 inch and 1/4 inch. The industry standard is to use 1/2-inch-thick backer board on wall tile installations, such as a tub surround.

Alodia Ash

Reviewer

What kind of plywood should I use for flooring?

Plywood has been a standard subfloor material since the 1950s and remains the preferred subflooring for many builders. Standard plywood can be used for subfloors, but a better material is 3/4-inch tongue-and-groove plywood subflooring.

Mussa Mirantes

Reviewer

How do you board a tile floor?

We don't recommend tiling directly onto floorboards due to excessive movement. Lay plywood or Hardie Backer Boards onto the floorboards first, using a bed of tile adhesive, to ensure a sound, flat surface which you can then tile onto.

Gilmer Petzl

Reviewer

How thick should a subfloor be?

Typically made of plywood or OSB and ranging in thickness from 19/32" to 1 1/8" thick, the subfloor is truly structural, second only to joists in this respect. Subfloor holds up all of the above layers of flooring, as well as everything in your house—people, dogs, cats, pianos, furniture. All houses have subfloors.

Pergentina Mutiel

Reviewer

What is Plytanium?

Plytanium® plywood exterior siding is an all-plywood, exterior-grade panel that is ideal for siding applications from new home construction and remodeling to do-it-yourself projects. Plytanium plywood siding is easy to install and offers long term durability.

Christof Tabanez

Supporter

Can you use OSB for bathroom subfloor?

OSB Subflooring
Oriented strand board (OSB) is similar to plywood but the structural differences are what set them apart. However, OSB is known for swelling around the edges when exposed to water. For tile flooring, this can cause bending and cracking, which is why it is discouraged as a subfloor material for tiling.

Hamadi Steel

Supporter

What screws to use for subfloor?

Steel Screws
The proper steel screw sizes for securing 3/4-inch plywood to the floor joists are #8, #10 and #12 screws. The number refers to the thickness of the screw. Each is available in lengths from 1 1/4 to 3 inches. Typically, the 3-inch variety is used to secure plywood subfloors.