However, you cannot slide the stud finder across the textured popcorn surface for an accurate location determination; there must be a flat surface between the device and the ceiling for the best results.

Will a stud finder work on a ceiling?

Stud finders measure density to find beams, so they don't work on popcorn ceilings. If your nail penetrates the ceiling and doesn't hit a solid surface, check again an inch away; if you don't find one there either, measure 24 inches in from the wall and check there instead.

Why won't my stud finder work on the ceiling?

Make sure you calibrate the stud finder by placing flat against the ceiling while holding the scan button until it indicates its ready. Also check that the studs aren't running the opposite direction that you are searching in. most joists or studs are 16" centers in newer homes.