Fixing tile backer board with plasterboard adhesive?

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plugy

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We are remodelling our bathroom, taking all back to brickwork. Fitting shower enclosures and wanting to make it warmer. Therefore going to clad walls and floor with tile backer board, namely Qboard from B&Q. Have read numerous conflicting accounts of fitting these panels, from battening out, use of tile adhesive or cement based flexible adhesive.
Our walls are are very poor and the manufactured recommends we cover with 20mm board for extra rigidity. My question is, can you stick these with plasterboard adhesive as it tends not to sag where put on thicker, as my walls are very bad, then fix through the dabs with the mechanical fixings. Anyone tried plasterboard adhesive on these?
Also going to overboard my ceiling with these boards, anyone skimmed over theses? Whats the process?
Any help would be greatly appreciated.
 
I was once working in a house where a builder was lining a bathroom. He dot and dabbed these boards on and the next day they were loose or falling off. Manufacturer recommended mechanical fixing only.

He hammered a few nails in and left it at that. Few months later after plastering and guess what happened, all plaster was falling off and boards were loose. I ended up stripping off, battening wall and mechanically fixing new boards on.
 
Will be using both, there are voids and undulations within the brickwork of 20mm or so. My idea was to use plasterboard adhesive to pack out these areas and thin dabs where the board will be contact with the wall then once set mechanically fix at recommended distance. Plasterboard adhesive is more to pack out and level the wall.
 
My theory was if the plasterboard adhesive sticks to masonry and the boards are coated with cementitious coating it would stick?
 
I have very successfully used foam PB adhesive to position the boards and then drilled and plugged through after the foam is solid.
 
I think they recommend using a powdered tile adhesive and then mechanical fixings with their proprietary washers. You could dot and dab, and pit the fixings through the dabs

I used qboard a few years ago, and it went on fine with this method
 
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