Does subfloor go under shower?

A floating floor needs to float, do not put it under the shower pan. 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.

How do you build a subfloor in a shower pan?

The subfloor needs to be a minimum of two layers of 3/4-inch exterior grade plywood before you can move to actually putting down the concrete layer of deck mud that provides the slope and the base for the shower pan tile.

Do you need to waterproof under a shower base?

All internal and external corners and horizontal joints are to be waterproofed within the shower area. Plasterboard joints (outside shower) that extend inside shower areas must be waterproof. Unenclosed shower areas are to be waterproofed to 1500mm from the shower. Tap-penetrations are to be sealed.

How to add subfloor to your shower floor?

Subfloor 1 Type of Subfloor. A subfloor is the layer at the very bottom of your shower pan. 2 Add to Subfloor. In order to add support and reinforce the subfloor structure, you can add a secondary layer that the built up shower pan will sit on top of. 3 Material For Subfloor. 4 Install Subfloor. …

Can a prefab shower pan be installed over the subfloor?

A prefab shower pan will be installed over the subfloor and over the top of the flange (adhered to the subfloor with modified polymer thinset) and silicon sealed to the top of the shower flange around the bolts–so in theory moisture should never get to the subfloor and leak through the small gaps around the outside of the flange.

How do you install a curbless shower floor?

You will need to add up the heights of your shower pan and subfloor thickness then deduct the thickness of the underlayment outside the shower to know how far down to install the 2×4. It’s better to error slightly deep than too high on the pan. Once your 2×4 has been installed, cut strips of plywood to go between each run of floor joists.

How to prepare a floor for a walk-in shower?

Premanufactured panels and pans as walk-in showers can be installed directly over the top of the concrete without any concern. Wood floors first need to be able to withstand the weight of a custom walk-in shower. Premanufactured kits do not weigh enough to be of concern, so you can go directly over the existing subfloor (plywood or OSB).

Do you need a shower pan for a new shower floor?

To ensure your shower is water-tight, whether it’s a new plumbing installation or you’re looking to upgrade your current shower, consider a new shower pan. While it is possible to create a shower floor using a pan liner and tile, a ready-made shower pan makes shower installation easier.

What’s the best way to replace a subfloor?

Toenail or screw 2×4 blocks to the joists to support the edges of the subfloor and the waste flange. Fasten the new subfloor patch in place, screwing all edges, including the old floor, to joists and 2×4 blocks. Use 1-1/2 in. screws spaced every 6 in.