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Ta. Helpful points there. I can remove the light switch and figure out the depth of the board.
What would you class as heavily laden do you think? 50 paperbacks? 100?
Vitsoe recommend against trying to mount to studs - probably to avoid the studs being constraints on the overall layout.
I think they recommend using fischer duoplugs rather than toggles or butterfly fixings.
Edit: ah no, some kind of expanding butterfly fixing.
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There’s a few factors.
How thick is the plasterboard. 12.5mm obviously will take more than 8. If you can hit a stud or two it will help a lot. Although with vertical fixings, I guess you either will or you won’t hit a stud.
The type of plasterboard fixing and how well you install it also makes a big difference.
Because the rails are vertical, that should help distribute the load downwards on to the fixings better than normal/shorter shelf brackets.
Be aware that heavily laden shelves may hold onto the wall, but crack the wall elsewhere. As the shelves will stay attached, but start pulling the plasterboard off the studs!