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Stesso
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Turn on Water and Test for Leaks — Test the System for Leaks

Intermediate

Part of project

How to Rough-In Plumbing for a Bathroom Vanity · Step 7 of 8

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In this video

Go outside and turn the main water supply back on. Return to the bathroom and check underneath the sink for any signs of leaking from the connections you just made. If it's dry, proceed to test the faucet by turning on the hot and cold water. Check that water is flowing correctly through the shower head. After testing, do one final check underneath to ensure no leaks have appeared under pressure.

Goal: Test new faucet installation

  • The presenter was surprised by water spraying from the shower head because it was left on. Make sure your faucet is in the off position before turning the main water back on.
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FAQs

How difficult is it to rough-in plumbing for a vanity, and how long should I expect it to take?

This project is rated "intermediate" because it requires precise measurements, proper pipe joining techniques, and an understanding of plumbing codes. For a DIYer with some experience, expect 8-16 hours of work, depending on existing wall access and any unforeseen issues. Costs can range from $150-$300 for materials, assuming you already own basic tools.

What are the most crucial safety precautions I should take when roughing-in plumbing?

Always shut off the main water supply before cutting into existing lines to prevent flooding. Wear appropriate personal protective equipment (PPE) like safety glasses, gloves, and hearing protection, especially when using power tools like drills and hole saws. Be mindful of electrical wires inside walls when drilling or cutting.

The guide mentions PEX for supply lines; can I use copper or CPVC instead, and what are the pros of PEX?

While copper and CPVC are alternatives, PEX is often preferred for DIY projects due to its flexibility, ease of installation (fewer fittings, no soldering), and resistance to freezing. However, PEX requires specific crimp or expansion tools. If you're comfortable with soldering, copper is a durable choice, and CPVC offers a rigid, solvent-weld option.

What are the most common mistakes DIYers make when roughing-in a vanity's drain and supply lines?

A common mistake is incorrect drain slope, leading to clogs – ensure a 1/4 inch per foot slope for DWV lines. Another error is misplacing supply stub-outs, making fixture installation difficult; always double-check vanity and sink specifications. Also, failing to properly prime and cement PVC joints can cause leaks.

Transcript
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the last thing I got to do is attach my hose again. All right let's turn on the water. Okay so I just went outside and I turned on the water. Note to self, turn off the shower before you turn, turn the water back on. So when I walked in all I could hear was water spring everywhere and of course I was horrified. So I'm like oh god I didn't attach the things tight so just water spring everywhere right now. I'm good news it's the shower curtain wasn't closed but it was confined to my shower and it did it stayed in my shower so that's good. So now I need to look under the sink and just kind of feel around and make sure there's no wet spots. So let's go down here and we're back under the sink. So hmm something's wet but let's dry it off again just to make sure that wasn't left over from before and I hope there's no spray. So I'm going to turn on the shower hose. Okay there's nothing wet. There's nothing wet down here. So all that water or I mean it was just a little bit of water. Let's just left over. So I think we're all good. I attached it. It works well. Let's look at the at this shower head here. I'm going to turn on the hot water.

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