What do you put over a bathroom subfloor?

Author: Rickie Hermiston  |  Last update: Monday, December 8, 2025

Underlayment is the material placed on top of the subfloor that assists in the installation of the tile or other type of flooring.

How to waterproof a subfloor in a bathroom?

Assuming your subfloor is in good shape and level, your next step is waterproofing. Use a layer of unmodified thin-set mortar on your substrate, then add an uncoupling membrane, like Schluter®-DITRA & DITRA-XL. Then add another layer of thin-set mortar on top of the membrane, and finally, you place your tiles.

Should I seal my bathroom subfloor?

Yes, sealing the plywood subfloor ensures better adhesion for peel-and-stick tiles and prevents moisture damage. Use a primer or sealer designed for flooring to create a smooth, even surface. This also extends the lifespan of the tiles by enhancing their bond.

What can I cover my bathroom floor with?

Bathroom flooring is available in vinyl planks, ceramic tiles, natural stones, engineered wood, waterproof laminates and more. Here are the benefits and features of these top options: Porcelain tiles are the most popular choice for bathroom flooring.

What is the best flooring to put over a subfloor?

Hardwood has been a flooring option for thousands of years. It works well over any type of wood subfloor more than 1/2 an inch thick. If squeaky floors are an issue, some construction adhesive will keep everything nice and quiet. Laminate floors can be installed over any wooden subfloor as long as it's in good repair.

Water Damage Bathroom Floor Repair - Fixing Hidden Water Damage

What goes over subfloor in bathroom?

You can either roll on a liquid latex membrane or use a peel-and-stick crack prevention mat over the entire concrete subfloor.

What goes on top of subfloor?

You have the top layer that is your floor covering (Hardwood, Laminate, Vinyl, Carpet, etc.), next you have the underlayment (usually a thin layer of fiber, foam, rubber), below that you have your subfloor (plywood, OSB, concrete), and lastly you have the joists which are the foundation to your floors.

What is the best thing to put on the bathroom floor?

Vinyl is a standout choice for bathroom flooring. There are several different vinyl products, including luxury vinyl tile (LVT) and vinyl roll (also known as sheet vinyl), and both of these are excellent bathroom flooring choices. They're durable, moisture-resistant, easy to clean and maintain, and warm underfoot.

What is the cheapest way to redo a bathroom floor?

5 Great Budget-Friendly Bathroom Flooring Options
  1. Standard Vinyl.
  2. Linoleum.
  3. Luxury Vinyl.
  4. Ceramic or Porcelain Tile.
  5. Concrete.

What is the best waterproof flooring for a bathroom?

Specifically, ceramic and porcelain tiles are great options for bathrooms. Tile flooring is resilient, waterproof, available in a variety of colors and designs, and generally less expensive than other hard surface options. Porcelain tiles absorb less water than any other ceramic product.

What type of subfloor is best for bathroom?

Cement board is best suited for: Ceramic and Porcelain Tile: Cement board is specifically designed to be a moisture-resistant substrate for tile in high-moisture areas like bathrooms and kitchens.

Should you waterproof entire bathroom floor?

Yes, it is essential to waterproof your bathroom floor before tiling to ensure that your bathroom is well-protected against water damage caused by leaks or seepages.

How do you keep moisture out of a subfloor?

What steps should you take to prevent subfloor moisture?
  1. Take proper measurements before, during, and after installation of the moisture level. ...
  2. Add a flooring underlayment with a vapor retarder barrier, also known as a moisture barrier. ...
  3. Make sure that your contractors don't penetrate the vapor barrier.

How do you cover a bad bathroom floor?

An obvious solution – laying down area rugs or large carpets – is the easiest, quickest and least expensive option. The right carpet or rug can uplift your room decor as well as visually separate different zones. By placing carpets and furniture strategically, you can cover almost the entire flooring of the room.

Is subfloor ruined if it gets wet?

A wet subfloor doesn't always need to be replaced, but it must be thoroughly dried and assessed for damage. Use fans and dehumidifiers to dry it out. If the subfloor is swollen, warped, or has mold growth, replacement is necessary.

How do you waterproof plywood for a bathroom?

To waterproof plywood, an epoxy, waterproof paint, oil, varnish, latex or PVA can seal the wood for both indoor and outdoor use. These can come in either a paint-on or spray form, and they all bond easily to the wood to seal it and protect it from moisture. Simply sand down, apply and leave to dry.

How much does it cost to replace a subfloor in a small bathroom?

The cost to replace a subfloor is $2.20 to $4.75 per square foot on average. Subfloor replacement costs depend on the area size and location, labor costs, and material. Plywood and OSB are the most common and least expensive subflooring materials. Bathroom subfloor replacement costs $100 to $570.

Can you redo a bathroom for 5000?

Home renovations can be expensive, but you can still give your bathroom a makeover on a relatively low budget. With a sum as small as $5,000, you can overhaul the space, but you'll need to make smart choices and be prepared to roll up your sleeves.

How do I keep my bathroom floor from getting wet?

Install anti-slip floor mats

Keeping a bathmat outside of your bathroom is an elegant solution. They will absorb the excess moisture from your feet.

What do you use to level a bathroom floor?

Use an underlayment, floor leveler or floor patch product to fix low spots in a wood or concrete subfloor. An underlayment is a thin layer of material sandwiched between two other materials. It's used to help insulate, absorb sound and reduce wear on your floor. It can also serve as a vapor barrier.

Should bathroom flooring go under the toilet?

Do I tile around or under it? How should the old toilet flange sit? The answer is, in most cases, that you should tile under the toilet flange and toilet tank. This allows for the toilet flange to be secured with the use of bolts.

What does the subfloor sit on?

Subfloor is a thick, stable base for the floor covering (like carpeting), and the subfloor rests on top of the joists. Underlayment, if required, is a thin buffer that rests on top of the subfloor. Underlayment is never installed directly on the flooring joists.

What is the best material for a subfloor in a bathroom?

Most builders and renovation contractors insist that the best choice for a bathroom subfloor is plywood.

Do you need underlayment on top of a subfloor?

Subfloors are in Good Shape

Well, underlayment is handy for a lot of things, but it's most crucial for stability. Not including houses that are pretty newly developed or were made with exceptionally great materials/attention to detail, most of our subfloors aren't flawless.

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