Shower Drain Options: Point Drain vs. Linear Drain

The Basics: What Does a Shower Drain Do?

A shower drain collects water from the shower floor and sends it to the drain pipe below. Sounds simple — but the drain type determines how your floor must slope, how tiles are cut, and how accessible your shower is. There are two main types: point drains (traditional center or off-center drains) and linear drains (long rectangular drains along one wall or edge).

Code Requirements: ASME A112.6.3 and IRC P2709

Both drain types must meet ASME A112.6.3, the standard for floor drains including shower drains. The key requirements:

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  Minimum drain capacity: The drain must handle the flow rate of your showerhead(s). Most residential showers with a single 2.0 GPM showerhead use a standard 2-inch drain — this is adequate for most configurations.
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  IRC P2709 slope requirement: The shower floor must slope toward the drain at a minimum of 1/4 inch per foot. This prevents standing water and mold growth.
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  Drain strainer: Must have a removable strainer to catch hair and debris. Required by both ASME and IRC.

Point Drains (Center or Off-Center)

How They Work

A point drain is a single square or round drain, usually 2–4 inches across, placed in the center or corner of the shower floor. The floor slopes toward it from all four sides — like a very shallow pyramid. The drain connects directly to a P-trap below the floor.

Advantages of Point Drains

• ✓ Lower cost — point drains start around $30–$150; linear drains start at $200–$600+
• ✓ Simpler plumbing — one drain, one P-trap
• ✓ Works well in all shower sizes and configurations
• ✓ Widely available in many finishes to match fixtures

Disadvantages of Point Drains

• ✗ The four-way slope requires more complex tile cuts, especially with large-format tile
• ✗ Large tiles (12×24 or bigger) must be cut at compound angles — wasteful and difficult
• ✗ Not ideal for curbless showers — the four-way slope makes water containment harder

Linear Drains (Channel Drains)

How They Work

A linear drain is a long, narrow channel (typically 24–60 inches long) placed along one wall or edge of the shower. The floor slopes in a single direction toward the drain — like one side of a roof. The drain connects to a P-trap at one end of the channel.

Advantages of Linear Drains

• ✓ Single-direction slope means large-format tiles go in with simple straight cuts — less waste, cleaner look
• ✓ Ideal for curbless (barrier-free) showers — the single slope directs water away from the bathroom floor
• ✓ More modern, architectural appearance
• ✓ ADA-compliant drain option for curbless designs (ADA 608.7)
• ✓ Easier floor cleaning — no grout buildup around a center drain

Disadvantages of Linear Drains

• ✗ Higher cost — quality linear drains run $200–$800+; top brands (Schluter, QuADRO, Infinity) run more
• ✗ Requires precise placement during rough-in plumbing — harder to relocate later
• ✗ The drain channel itself needs regular cleaning to prevent buildup
• ✗ Some linear drains have lower flow capacity — verify GPM rating matches your showerhead setup

Which Drain Should You Choose?

Related Reading

• Walk-In Shower Ideas for Small Bathrooms
• Shower Waterproofing Guide
• Bathroom Tile for Aging in Place
• Tile Shower Curb Guide — Curbed vs. Curbless