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Set and Secure the Shower Pan — Install the Drain Assembly onto the Pan

Intermediate

Part of project

How to Install and Level a Shower Pan Base · Step 2 of 9

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In this video

First, dry-fit the shower pan and use a level to ensure it is perfectly level on all four sides, using shims if necessary. Next, install the drain assembly by applying plumber's putty to the drain flange and pipe dope to the underside, then tightening the gaskets and nut. Lay down paper on the subfloor, mix a batch of mortar, and spread it evenly. Carefully set the shower pan into the wet mortar, pressing down to ensure full contact and re-checking for level. Secure the pan's flanges to the studs with the provided clips and screws. Once the mortar has set, use an inside pipe cutter to trim the PVC drain pipe flush. Finally, install the rubber gasket, brass nut, and drain cover plate.

Goal: Install shower pan

  • If the pan isn't level during the dry fit, use wood shims or a full shingle to raise the low side.
  • Place paper on the subfloor before applying mortar to prevent it from falling through cracks in the floorboards.
  • Wiggle the pan when setting it in mortar to ensure it makes good contact with both the mortar and any shims used for leveling.

Used in this video

  • Level (Tool Type: Measuring Tools)Ensuring the shower pan is perfectly level.
  • Adjustable Pliers (Tool Type: Hand Tools)Tightening the drain assembly nut.
  • Utility Knife (Tool Type: Hand Tools)Trimming excess plumber's putty.
  • Trowel (Tool Type: Hand Tools)Spreading mortar evenly.
  • Drill/Impact Driver (Tool Type: Power Tools, Power Source: Battery)Securing pan clips and cutting the drain pipe.
  • Inside Pipe Cutter (Tool Type: Drill)Cutting the PVC drain pipe flush from inside the pan.
  • Screwdriver (Tool Type: Hand Tools)Tightening the brass drain nut.
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FAQs

What is the most critical step to ensure a leak-free shower pan installation?

The most critical steps involve a thorough dry fit to confirm proper drain alignment and a securely sealed drain connection. Ensure the pan is set in a complete and solid bed of mortar, and all plumbing connections are sealed with appropriate compounds for long-term integrity.

How important is it to perfectly level the shower pan, and what happens if it's not?

Perfect leveling is crucial for proper water drainage. If the pan isn't perfectly level, water will pool in low spots instead of flowing to the drain, leading to mold, mildew, and potential subfloor damage. Use a reliable level and check it from multiple angles during the dry fit and after setting the pan.

What type of mortar should I use for setting the shower pan, and how do I mix it?

Use Type S mortar, like the Greencore 65 lbs. Type S Mortar listed, as it offers superior strength and bonding. Mix it according to the manufacturer's instructions to achieve a thick, peanut-butter-like consistency that is workable but firm enough to hold the pan's position without slumping.

What safety precautions should I take when installing a shower pan, especially regarding dust and materials?

Always wear work gloves, safety glasses, and a dust mask (such as the Dyiom or Paitning mask mentioned) when mixing mortar, cleaning the subfloor, or cutting materials. Ensure your work area is well-ventilated to minimize inhaling dust and chemical fumes for your safety.