I am planning to install built-in shelving only as deep as the studs in my wall. There are several things that give me pause that I have questions on. 1) the stud sensor is telling me that the studs are doubled up. I'm wondering if this is a load bearing wall as, 2) the wall has the family room on one side and the guest bath on the other, but above it on the second floor it is an outside wall as there is only a roof over the guest room and bath. 3) There is a vent pipe right down the center of where I want to locate the shelves, if the wall is load bearing how can I re-route this, & 4) if it is load bearing, will I need to build headers in as if I were installing a window?
Update: We have decided that messing with the wall, as it is surely load bearing (based on your answers), is not a great idea. Since we wanted a simple project & not to completely restructure the wall we looked at alternative options. We have decided to makes some floating shelves that will still give us the depth and also hold the decorations.
Thanks for your help! Eric