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Prepare the Subfloor — Plan and Mark Location

Beginner8 hours

Part of project

How to Install a Waterproof Foam Shower Niche · Step 1 of 6

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In this video

The project begins by showcasing the prepared shower alcove. The subfloor has been made perfectly level using a self-leveling compound. The surrounding walls are open to the studs, where wood blocking has been installed to support future grab bars. A new 2-inch drain pipe is centrally located but protrudes too high above the floor.

Goal: Surface Preparation

  • A perfectly level floor is critical for proper drainage and to prevent the shower pan from cracking.

Used in this video

  • Self-leveling compound (Supply Type: Flooring)Creating a perfectly level surface for the shower pan to sit on.
  • 2x8 Wood Blocks (Supply Type: Lumber)Providing a solid backing within the wall studs for mounting grab bars later.
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FAQs

The project is listed as 'beginner' difficulty, but 8 hours seems like a long time. What makes this project take so long, and is it truly suitable for a first-timer?

While the individual steps are straightforward, the 8-hour estimate accounts for careful measuring, precise framing, allowing sealant to cure, and meticulous waterproofing. Rushing these critical steps can lead to leaks, so taking your time to ensure everything is perfect makes it beginner-friendly by emphasizing accuracy over speed.

The required tools list several different drills. Do I need multiple drill/drivers, or will one standard cordless drill suffice for this project?

You only need one capable cordless drill/driver, such as the RYOBI ONE+ 18V Cordless 1/2 in. Drill/Driver, to complete this project. The multiple listings provide options for suitable tools. Ensure your chosen drill has enough power to drive screws into wood studs and backer board efficiently.

What is the most critical step to ensure the shower niche is completely waterproof and won't leak?

The most critical step is the meticulous waterproofing of all seams, especially where the niche meets the backer board. Apply a continuous bead of high-quality waterproof sealant like DAP Ultra Clear, and then properly embed waterproofing banding over all seams and fasteners. This creates a monolithic, leak-proof barrier essential for preventing water damage.

What if my existing wall studs aren't perfectly spaced for the pre-fabricated niche? Do I need to modify the framing?

Yes, you will likely need to modify your wall framing using 2x4 lumber to create a precise, sturdy opening for the niche. This often involves cutting existing studs and installing horizontal blocking to perfectly frame the niche's dimensions, ensuring a flush and stable installation. Accurate framing is crucial for long-term stability and waterproofing.

Transcript
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Welcome back everyone. We're back at the job site converting a tub to a shower surround. Today we're gonna install the shower pan. As you can see the floor has been perfectly leveled already. So a drain pipe along with the rest of the rough and plumbing is now complete. As you can see the two by eight wood blocks have been installed as backup for the grab bars. Some of this wood has been removed because the lots of dry rot. That's a two inch drain pipe. That's new. And then we also have the self leveling compound. Let me show you that process right now. So what we need to do now is this drain pipe is sticking up too high when it was

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