We are trying to add bookshelves onto our apartment wall; specifically, elfa system shelves (site is in Swedish, but I'm sure you can get the gist based on the photos). However, we are somewhat concerned as to whether or not the wall can support the shelves.
Our concern, however, is that the wall itself may not be ideal to mount into. It is built over the brick exterior of the building with approximately 5cm of empty space between the plaster wall and the brick. The drywall itself, unfortunately, does not run all the way to the ground: due to a water pipe that runs along the floor to a radiator, the plaster doesn't sit directly on the ground, nor on anything, really.
We have used a stud finder, but what it has found is... inconclusive. We could not really consistently find any indication of what the plaster is mounted on that we could use to also mount our shelves into, and so our only hope would be to mount the shelves directly into the drywall.
We are aiming to mount the rails with these kind of drywall anchors, but the concern of course is that I assume any description of how much weight they can support is predicated under the assumption that the drywall itself is well-supported. Unfortunately, we can't really tell if that is the case or not.
Our questions are the following:
- Is possible and safe to mount bookshelves directly into the drywall?
- If not directly, is there something we can do the help support the shelves?
- More generally, how can we get a sense of how much weight can be safely supported?
We should not that this shelf would be above our living room couch, so since we don't relish the idea of always wearing safety gear while relaxing, we want to ensure that our shelves will be stable enough.