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meneer in reply to @jackbepablo

https://www.toolstation.com/fischer-hm-s-metal-cavity-fixing/p73656

I’ve used these (maybe different length) to put up twin slot book shelves on insulated plasterboard. Get the setting tool.

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jackbepablo in reply to @meneer

Annoyingly there’s no cavity, the board is laid on top of a single skin brick wall (conservatory). I’ve picked up something similar to Airheads suggestion, will report back

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meneer in reply to @jackbepablo

yeah the name is misleading but from my experience (and I seemed to remember Fischer’s own specs) they don’t need a cavity, the metal ‘umbrella’ still expands in the foam insulation and pulls tight behind the plasterboard. Tho I had 100mm and studs in front of a brick wall.

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