I’m planning to make some floating shelves 150 cm wide and 30 cm deep.
I want to mount them on a wall that has a plasterboard of thickness 13mm behind which is a plywood backing of 15mm according to the details provided by the contractor (see the attached image). This construction was apparently intended for hanging TVs and they recommend using wood screws that are not longer than 30mm.
One of the shelves will have my record collection which could weigh between 25-50kg. What are some options for hardware I can use to mount the floating shelves?
i wouldnt put too much weight or leverage on that shelf. the sheet rock is basically doing nothing and plywood, depending on the quality and with that thickness is not much to grab on to. are there no studs you can hit? depending on how many screws you are able use, i would potentially use GRK brand cabinet screws, if you can find them. theyre some of the best in the business as far as bite and sheer strength. if you can do a longer horizontal run like a ledger you can distribute alot of the load across the wall, instead of on a few points only…my tv mount is designed to hit studs with like 2 1/2" lags…way burlier…but i would consider grk cabinet screws. what is keeping the whole wall from flexing under weight though?
Your last question is a good one. I have no idea - I’m pretty new to this stuff. What is normally used to keep a wall from flexing?