How to Find a Stud in the Ceiling (aka Ceiling Joist)

Living room ceiling--tile between the joists

Whether you’re hanging a plant, chandelier, ceiling fan, or even something as heavy as a bed, you must anchor it to a ceiling joist to hang it securely. Ceiling joists, similar to studs in walls, provide the support needed to hold the heavy object.

If you mount something heavy without fastening it to a joist, you might cause severe damage to your ceiling. You might even cause the object to come crashing down. This guide will help you find a ceiling joist with or without a stud finder.

How to Find a Ceiling Joist Using a Stud Finder

a man using stud finder to find studs
Photo Credit: ungvar / Adobe Stock Free / License

A stud finder is a top-notch tool for locating frame studs hidden under the final walling surface. The following steps will help you to find a ceiling joist with a stud finder:

Choose the Proper Stud Finder

Stud finders come in two varieties. Those are magnetic and electronic stud finders. Magnetic stud finders can locate the metal screws or nails that lodge in wall studs that, eventually help to find studs. 

Electronic stud finders make locating studs and other concealed components like cables or pipes simpler by using sensors to detect changes in the density behind the wall or ceiling. Electronic devices are considered more accurate than magnetic ones.

Read More: How to Find a Stud in the Wall

Scan the Ceiling

Slowly move the stud finder across the ceiling. When it detects a joist, it will either beep or light up. Mark the spot using a pencil.

Confirm Your Findings

Use the stud finder to find an adjacent joist left or right from the already identified one. Since most ceiling joists are spaced 16 to 24 inches apart, measure the distance between the two joists to confirm your findings.

Ceiling joists are spaced similarly to wall studs. Check out “How Far Apart Are Ceiling Joists?” to learn how to measure the distance between them.

How to Find a Ceiling Joist Without a Stud Finder

If you don’t have a stud finder, don’t worry. You can still find a ceiling joist using the following methods:

Knock Test 

The knock test is a traditional way to identify a joist. Gently knock or tap the wall, ensuring the room is quiet. If you hear a hollow sound, that indicates there’s no stud. But if the sound becomes muffled, you’ve found a stud. Mark the spot using a pencil.

Magnet Method 

The magnet method might seem unconventional, but you can actually find ceiling joists using magnets. Attach a magnet to tape or dental floss and drag it across the wall. The metal screws securing the drywall are usually attached to a stud. So if the magnet sticks to the wall, you’ve found the stud. Mark the location where the magnet sticks.


Side note: Try using a stronger magnet if the magnet isn’t sticking. There’s also a chance your drywall is secured with adhesive rather than screws. If so, you must use a different method to locate the studs.

Using a Stud Finder App

searching stud finder app
Photo Credit: Racheal Oyebode

Nowadays, smartphones can do anything. Yes, and it can even find a wall stud. Look for a stud finder app in your app store and download it. To use the app, follow its instructions, which usually involve launching it and holding your phone against the wall like an actual stud finder. The app will then alert you when it detects a stud.

Find more methods for finding studs and joists in our article “How to Find Studs Without a Stud Finder.”

Find Ceiling Joists in Different Types of Houses

Finding a ceiling joist can vary depending on your home’s structure. Here’s how to approach the task for different types of houses:

One-Story Houses

Ceiling joists in one-story homes usually run perpendicular to the roof’s peak. They will usually run across the whole width of the house, crossing the peak line at a right angle.

Multi-Story Houses

ceiling joists in a multi story house
Photo Credit: bilanol / Adobe Stock Free / License

Based on the arrangement of the rooms and the need for structural support, ceiling joist orientation may vary in multi-story houses. They tend to run parallel to the shortest walls in a room. Based on the room’s shape and orientation in the home, they may run in unexpected directions, so double-check before you start drilling.

You can identify the direction of the joists by using a stud finder in several places throughout the room. In multi-story homes, joists may also be aligned to provide structural support between floors, so keep in mind that they might not run in a uniform direction throughout the house.

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Main Image Credit: Guastavino Vaulting / Flickr / CC BY 2.0

Khadiza Swarna

Hi, I'm Khadiza Swarna. I’m passionate about making home improvement projects simple and enjoyable. When I’m not writing, I love tackling DIY projects around the house and spending quality time with family. I also enjoy collecting currencies from different countries.