How To Build A Shower Pan Hot Mop

6 min read Jul 30, 2024
How To Build A Shower Pan Hot Mop

How to Build a Shower Pan Hot Mop

A hot mop shower pan is a durable and watertight solution for your shower floor. It involves applying a layer of hot asphalt-based waterproofing membrane to a prepared subfloor. This guide will walk you through the process of building a hot mop shower pan.

Important Note: This is a complex project requiring specialized tools and experience. It is recommended to consult a professional contractor for guidance and assistance.

Materials:

  • Plywood: 1/2" or 3/4" exterior grade plywood, cut to fit your shower pan dimensions
  • Concrete backer board: 1/2" thick, cut to fit your shower pan dimensions
  • Waterproof membrane: Hot mop asphalt-based waterproofing membrane
  • Flashing: Metal flashing for the shower pan perimeter
  • Drainage system: Shower drain and necessary components
  • Mortar: Thin-set mortar for setting the concrete backer board
  • Primer: Bonding primer for the subfloor and backer board
  • Sand: Fine sand for filling gaps and leveling
  • Tools: Trowel, putty knife, hot mop kettle, safety gear (gloves, mask, eye protection)

Steps:

1. Prepare the Subfloor:

  • Clean: Ensure the subfloor is clean, dry, and free of debris.
  • Level: Use a level and sand to level any unevenness.
  • Prime: Apply a bonding primer to the subfloor to promote adhesion.

2. Install the Plywood:

  • Cut and secure: Cut the plywood to fit the shower pan dimensions and securely attach it to the subfloor using screws.
  • Create slope: Create a slight slope towards the drain by adding a thin layer of mortar or shims under the plywood.

3. Install the Drainage System:

  • Install drain: Install the shower drain according to manufacturer instructions.
  • Ensure slope: Make sure the drain is properly installed and positioned to accommodate the slope you created.

4. Apply the Hot Mop Membrane:

  • Heat the membrane: Heat the hot mop membrane using a hot mop kettle according to manufacturer instructions.
  • Apply layers: Apply the hot mop membrane in multiple thin layers, ensuring each layer is completely dry before applying the next.
  • Create a lip: Extend the hot mop membrane up the walls of the shower pan to create a lip that prevents water from escaping.

5. Install the Flashing:

  • Cut and bend: Cut and bend the flashing to create a watertight seal around the perimeter of the shower pan.
  • Secure with mortar: Use thin-set mortar to secure the flashing to the shower pan walls and ensure a tight seal.

6. Install the Concrete Backer Board:

  • Cut and apply primer: Cut the backer board to fit the shower pan area and apply primer to both the backer board and the hot mop membrane.
  • Set with mortar: Use thin-set mortar to set the backer board onto the hot mop membrane, ensuring it is level and aligned with the drain.

7. Finish and Seal:

  • Sand: Sand any rough edges or imperfections in the backer board.
  • Caulk: Caulk around the perimeter of the backer board and at the junction with the shower walls to prevent water leaks.

Important Considerations:

  • Ventilation: Proper ventilation is crucial to prevent moisture buildup during the drying process.
  • Safety: Always wear appropriate safety gear when working with hot mop membrane.
  • Professional help: Consider seeking professional help for this project, especially if you lack experience.

This guide provides a general overview of building a hot mop shower pan. Remember, proper planning, attention to detail, and adherence to safety guidelines are crucial for a successful outcome.