Hi, I am planning to set up a bookshelf on a wall that is 13 mm plasterboard and 12 mm OBS board. I will use Spax screws that will be 25 mm (+ bracket depth) and 4-5 mm in circumference.
The shelf is 200 cm long, 19 mm thick, and is supported by 4 brackets with 18 cm depth and 18 cm height. Each bracket is held up by two screws.
Will this shelf be able to be used as a bookshelf?
How do I calculate how much weight it will be able to support?
See picture.
Thanks for the input!
Diagram of a 200 cm long shelf supported by four brackets, each 18 cm high, spaced at 40 cm intervals, with ends of the shelf extending 33 cm beyond the outer brackets.
 
F fivefootnine said:
Hi, I am planning to set up a bookshelf on a wall that is 13 mm gypsum and 12 mm obs board. I will be using spax screws that will be 25 mm (+ bracket depth) and 4-5 mm in circumference
The shelf is 200 cm long, 19 mm thick and supported by 4 brackets with 18 cm depth and 18 cm height. Each bracket is supported by two screws.
Will this shelf be able to be used as a bookshelf?
How do I calculate how much weight it will be able to support?
See image.
Thanks for the input!
[image]
Yes. It will be able to support all the books you can fit.
 
The sizing for the shelf can be calculated with the Sagulator, but the brackets are so close together that it should work anyway. An M4 molly plug in single drywall supports 18kg, a wood screw with a diameter of 4-5mm can handle more than that, a meter of books weighs about 20kg.
 
For the best fastening, pre-drill with a drill bit 0.5 mm smaller than the screw's core. When screwing directly into OSB, it tends to split on the backside, and the screw doesn't hold as well as it could.
 
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