Fixing to this high plasterboard wall

[Keitai]

The walls hollow so I guess plasterboard. Can't find studs with magnets or stud finder but kitchen units are going up on it. What fixings? Gonna be heavy. Do the hooks go onto these plates in picture?

For loft can I cram down the insulation and cut osb to GP on top? What's all covered

TACH]

 

[johnny2007]

Don't fix cabinets to plasterboard, it will fail.
You must find solid stuff (bricks behind dot & dab or studs.
Worse case you need to cut a bit of plasterboard, insert tape measure and see where studs are or go deep enough if dot & dab

 

[Burnerman]

The brackets on the third pic are the ones that hold the cupboards to the wall.
If the new units are going to sit on top of the existing ones then hollow wall fixings will be fine - so long as all is good on the ones below. Do find out how they are fastened though!
John

 

[robinbanks]

The walls hollow so I guess plasterboard

Remove a 100mm+ high strip of plasterboard and replace with ply at the height that will carry the fixings

. Do the hooks go onto these plates in picture?
View attachment 366882

Yes but that's the wrong way round. You'll screw that bracket to the wall through the preformed holes so it will end up that the side your thumb is touching is what is against the back board of the cabinet

For loft can I cram down the insulation and cut osb to GP on top?

Dunno what GP is, maybe "go"?

No, you can't compress insulation, because it diminishes its effectiveness. You ought to be striving for 270 mm of wool up there, not compressed. Compressing insulation too much can also have a detrimental effect on your ceiling plasterboards. Consider loft legs or thickening the joists to get a void of 270mm+

 

[freddiemercurystwin]

As a side note, if you're fitting additional units above the existing why don't you at least fit the same size units?

 

[robinbanks]

As a side note, if you're fitting additional units above the existing why don't you at least fit the same size units?

In a hundred years it'll be sought after authentic rusticity?

 

[foxhole]

It will all end in tears.

 

[RrogerD]

That's an odd look, with units on top of the other and, not having the doors aligned.
What are your bigger plans for the room?