A bathroom plumbing rough. Why Drain Hole Size Varies (Vessel Sinks and Other Exceptions) While the 1-5/8 inch to 1-3/4 inch range covers most standard drop-in or under-mount bathroom sinks, certain design types feature a different drain hole size. Vessel sinks, which sit entirely or partially above the countertop, are the most frequent exception.
A bathroom plumbing rough-in is the phase of measuring and marking fixture centerlines and heights, drains, and clearances. During this stage, a plumber excavates, lays, and routes water and drain lines from the utility to your home's wall cavities. Here's an easy to print version of this table.
We will use these fittings to plumb this bathroom in just a moment. But first, I need to mention The bathroom plumbing rough-in dimensions you need to know. The bathroom sink rough-in dimensions are as follows: The center of the lav's drain is located 18" (approximately) above the finished floor.
Our guide gives you everything you need on bathroom fittings & components so you can learn how to plumb a bathroom DIY with confidence. Finally, when installing drain grates of any type, it pays to think about how the required water management will determine the bathroom's contours. Mentally/visually mapping the contours of the bathroom floor with the desired drain design will provide greater insights into the possible effectiveness or the shortcoming of the drainage system.
Bathroom sink drains explained in this 2025 guide: types, components, sizes, and expert tips to help you pick a durable, clog. Drains are measured at the threaded portion of the drain. (This is the section that will go through the sink and countertop.) A standard bathroom sink hole is 1-½" in diameter and will accommodate most lavatory drains.
Measuring bathroom sink drains is a relatively straightforward process. You'll need a tape measure as well as a spare notepad and pencil to record your measurements. Begin.
The definitive guide to bathroom rough in dimensions. Get standard measurements for toilets, sinks, tubs, and showers to ensure your project meets code. Minimize long horizontal runs of drain and vent pipes by installing fixtures on or close to the wet wall.
Plan for a layout that's comfortable and convenient. We'll walk you through the bathroom plumbing diagram below and how to install a basic 5 × 8.