Oak Splashback Coming away from plaster

[lancs_lad]

I'm about to move into a new home that has wooden splashback that has sprung from the plaster slightly over about a length of 8 inches. Just wondering what the best adhesive for fixing it would be? It's only about 2 or 3 inch depth with tiles above.

 

[Deleted member 174758]

Normally I'd just suggest a grip adhesive such as GripFill used in conjunction with a timber brace or prop (aka a "go bar") to keep everything in place whilst the adhesive sets (12 to 24 hours). In this case I'll be more specific and suggest GripFill yellow (non-solvent) which is easier to work into narrow gaps. Alternatively, if you mask off the wall and top of the upstand it may be possible, depending on the size of the gap, to use the foam plasterboard adhesive that @foxhole is so keen on, but you will still need to leave some sort if go bar in place to hold the upstsnd against the plasterwork whilst the foam sets. Not sure how much clean up foam requires, though, as I'm still experimenting with it

 

[foxhole]

Why has it come away ? Splashback warped?
Wall not flat?

 

[lancs_lad]

Why has it come away ? Splashback warped?
Wall not flat?

I have no idea at the moment. It was something the homebuyers report showed up. It's not a major issue as we intend replacing the wooden worktops at some point anyway but it would make sense just to fix it in place until that happens.