I’m using a studpop (https://youtu.be/Dojw5nakCsY) to detect studs as I’m ready to install a grab bar on my fiberglass shower wall. I’m attaching a picture of my shower wall, where there is a window above it.
So I ran the studpop on that space between the window and the shower wall. I put marks on the blue tape where the studpop ball pops to the center when it detects a nail on a stud behind the wall. What I did was I would run the studpop from left to right then put a mark where the studpop initially detects a nail “left edge”, then move the studpop about 4-5 inches to the right and run it towards the left to get the “right edge”.
However, as you can see from the picture I have four markings on the first stud location (I encircled the marks so they look like eyes just for emphasis). I read that most US homes have studs that are 16-24 inches apart. My condo was built in 1980-1981 so I assume homebuikders follow the same standard through the years. Anyway, the markings show that this stud location seemingly has two studs very close to each other, presumably to support the window right above it. I observed the same situation between the middle and right stud locations as I run the studpop across the same wall within the width of the window. Am I right to assume that each of these three stud locations actually has two studs - which my guess is to support the window that is installed above the shower wall?
If my assumption (two studs in one stud location) above is correct, then am I correct to assume that the vertical line marking on the tape would be the center of the “second stud” in the first stud location?
Thanks in advance.
Update: I am adding pics of my bathroom because Jim noticed those tiles and he thinks they are ceramic tiles. All along I thought this is just part of the design. The shower stall was already in place when I moved in in 2002.