Installing a trough drain in your shower is one of the most effective ways to manage water flow and create a seamless, spa-like experience. Unlike traditional point drains, a trough drain captures water across its entire surface, preventing pooling and providing a more luxurious aesthetic. This guide walks you through the process, from initial planning to the final waterproofing checks, ensuring a professional finish.
Understanding Trough Drains and Their Benefits
A shower trough drain is a linear channel embedded into the structure of the shower, typically made from materials like brass, stainless steel, or PVC. The drain cover runs the length of the trough, allowing water to flow freely into a concealed plumbing system. The primary advantage is superior water management, eliminating the puddles common with standard drains. This design is also ideal for tiled showers, as it can be integrated directly into the tile layout, creating a sleek, uninterrupted floor.
Planning Your Drain Location
The success of your installation begins with precise planning. You must decide where the trough will sit—at the base of a sloped shower floor or against a wall with a slightly lower threshold. Consider the slope; the entire floor must angle gently toward the trough, usually requiring a minimum slope of 1/4 inch per foot. Mark the exact center line of the trough on the subfloor, as this is the reference point for the entire tile layout and the eventual position of the drain flange.
Tools and Materials You Will Need
Gathering the right tools prevents delays and ensures a tight, leak-proof seal. You will need a reciprocating saw or oscillating tool for cutting, a notched trowel for applying thinset, a level, and a reliable waterproofing membrane. For the drain assembly itself, you will require the trough drain kit, which includes the channel, strainer, and necessary hardware. Having plumber’s putty or silicone sealant on hand is essential for creating a watertight connection between the drain and the subfloor.
Key Components of a Trough Drain Kit
| Component | Purpose |
| Trough Channel | Captures and directs water flow. |
| Strainer/Lid | Prevents debris from entering the pipe. |
| Flange | Secures the drain to the subfloor. |
| Tailpiece | Connects the drain to the P-trap. |
The Step-by-Step Installation Process
With the layout marked and tools ready, you can begin the installation. First, ensure the subfloor is solid and clean. Apply a layer of thinset mortar to the marked area, embed the drain flange, and secure it with screws if necessary. It is critical to maintain the correct height; the top of the drain body must be perfectly level with the surrounding finished tile surface to avoid creating a tripping hazard or a gap that traps water.
Laying the Tile and Waterproofing
Once the flange is set, proceed to tile the shower floor, making sure the tiles slope subtly toward the drain grate. Before applying the final grout, you must waterproof the entire assembly. Roll out the waterproofing membrane over the tiles, extending it up the walls to the required height. Pay special attention to the edges of the trough drain, sealing all seams meticulously. Any gap here will result in moisture penetrating the subfloor, leading to mold and structural damage.
After the waterproofing cures, set the final tiles over the membrane, carefully cutting around the drain cover. When the tile work is complete, install the strainer and connect the tailpiece to the P-trap. Test the system by pouring several gallons of water into the trough. Observe the underside of the drain to confirm there are no leaks. If the water drains swiftly and evenly without any drips, the installation is a success.
Maintenance Tips for Long-Lasting Performance
Even the best installation requires regular care to function optimally. Hair and soap scum are the enemies of a trough drain; they accumulate quickly and reduce flow, leading to standing water. To prevent clogs, remove the strainer weekly and rinse it under hot water. For a deeper clean, use a soft-bristled brush to scrub the channel. Avoid using harsh chemical drain openers frequently, as they can corrode metal components over time. A simple routine of rinsing with hot water after showers significantly extends the life and efficiency of your drain.
