I recently made a floating shelf, roughly 2m long. It is a hollow box mounted on a timber bracket with 5 crossbars and attached to 4 studs via 10 x 100mm coach screws with washers. This means that 50mm of the coach screw goes through the 2x4 bracket and then 50mm goes back into the wall.
I have loaded it up with books, which means we are talking about probably around 60kg that it is holding in addition to the weight of the hollow box. And so far it is doing fine, but I just wanted to make sure that it would hold long term.
Do you think 10 x 100mm coach screws are going to be enough to hold this level of weight or it would be worth replacing them with 10 x 120mm coach screws or even 12 x 120mm coach screws? I didn't want to go too long or wide, since the stud is only 75 x 50mm and I didn't want to risk splitting the stud.
In any case, what do you think, should the 10 x 100mm screws hold this weight (with only 50mm of them through the wall, roughly 10mm of that plasterboard and the rest the wood stud) or should I get slightly longer/wider screws?
I have loaded it up with books, which means we are talking about probably around 60kg that it is holding in addition to the weight of the hollow box. And so far it is doing fine, but I just wanted to make sure that it would hold long term.
Do you think 10 x 100mm coach screws are going to be enough to hold this level of weight or it would be worth replacing them with 10 x 120mm coach screws or even 12 x 120mm coach screws? I didn't want to go too long or wide, since the stud is only 75 x 50mm and I didn't want to risk splitting the stud.
In any case, what do you think, should the 10 x 100mm screws hold this weight (with only 50mm of them through the wall, roughly 10mm of that plasterboard and the rest the wood stud) or should I get slightly longer/wider screws?