Hanging bathroom sink on stud wall

BarraOG

I wish to hang a bathroom sink with pedistal on a wall built with 2x4. There is plasterboard on one side which I will tile but the partition is open on the back. The mounting holes will be like this with respect to the studs:

Sink comes with these screws:

I only have 2 x 4 lying around. So my plan is to cut out a rectangular hole in the plasterboard and then cut a 2 inch deep, 4 inch high notch into the centre stud and then mount a length of 2 x 4 into this so that it extends between the two studs on either side. I'll then screw this length of 2 x 4 into the studs at each end and add extra lengths of horizontal 2 x 4 under it as required to make it rigid.

I'll then get carriage bolts, also M8 like the screw in the picture, which I will use instead of these but I'll make use of that grey plastic piece. The head of the bolt will be on the far side of the 2x4 I mount into the partition and I'll tighten from under the sink.

I'd like to mount everything and make sure it looks good before I tile the wall. Floor is already tiled.

Does that sound like a reasonable approach?

Hobby farmer

Cut the plasterboard and put in noggins to catch the screws, replace the plasterboard, fill/sand/paint then fix the pedistal to the noggins, drill a pilot hole and use the supplied screws. don't notch the studs.

Hobby farmer

Also tile the wall first, cutting tile around the sink is a ball ache

BarraOG

https://www.boards.ie/discussion/comment/123002493#Comment_123002493

Thanks, I was planning on taking down the sink again before tiling. But youre suggesting I use the screws provided, which means I should wait to screw into the pilot holes until after I am ready to permanently hang the sink. Since the wall is open on the back, I don't need to cut plasterboard with this approach. I think this is a better way to do it. When screwing in the noggins I'll screw in at an angle obviously.

Hobby farmer

Yep, that's ideal so. If you went with your original plan of coach bolts, if you ever need to remove the sink you'll have a job on your hands, that's why I said use the provided screws.

GreeBo

The pedestal holds the sink up and takes all of the weight, the screws are just to hold it against the wall.

As HobbyFarmer suggested, cut the plasterboard to fit noggins then patch the board and tile over, then fix the sink to the wall. Dont forget to account for any height changes due to floor tiles…