Assuming that your wall units have got the usual adjustable hangers on the back you should use a continuous hanging rail get them from woodfit.
Hanging kitchen units on stud wall.
The wall studs are crucial to properly support the weight of the cabinets.
Be sure to use a level to assure this line is true horizontal.
Absolutely fool proof and togglers are really easy to use.
It is punched at intervals typically 1 so you can fix it to every vertical stud.
Finally mark the stud locations.
Use a cow magnet stuck into one end of a 10 piece of 1 2 diameter surgical tubing to find the studs.
Label the location of the kitchen wall cabinets and appliances on the wall.
A general rule to follow when determining the best height to hang cabinets is to keep 8 or 9 feet high.
Hanging kitchen units on stud walls offers a small problem when fitting a kitchen as you need to ensure that you adequately support the weight of the wall units.
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Draw a horizontal line across the wall at this 54 inch point which will serve as a guide for hanging the cabinets.
Hold on to the free end of the surgical tubing and let the cow magnet dangle down then move the whole thing across the gwb surface and the magnet will snap into place over a stud.
Yes you have the vertical studs but the chances of them coinciding with the required unit fixing points is pretty small and simply relying on hollow wall fixings for the areas in between studs really is not an option.