When hunting for wall studs usually the goal is vertical studs.
Studs around sliding glass door.
Sometimes these are two by six studs turned on edge.
If this is an exterior door there s likely a solid header above.
The studs that surround the door frame will extend to the top plate top of wall.
Above windows and doors are doubled up studs called headers.
If you re using a zircon or similar studfinder and initiate the scan with the tool held above the door it will register no density change and indicate a no stud condition.
Make sure you measure to the framing right next to the old door jamb.
Sliding glass doors give you easy access to fresh air and sunshine but they can also let a little too much of those golden rays shine inside.
Initiate the scan 8 adjacent to the doo opening and move the tool to above the door.
But there are also horizontal framing members located above and below door and window openings.
Find wall studs above and below doors and windows.
How to hang curtains over sliding glass doors.
If you measure 1 3 4 2 from the inside of the door frame there should be a stud running vertically to the ceiling.