Plug for gypsum on foam plastic

[-MH-]

My garage roof is apparently made of foam behind the drywall. Jula no-name plugs or Fischer SX didn't work. The plug doesn't expand behind the board, probably because the foam is resisting. But it doesn't resist enough for the plug to stay...

What is recommended??

 

[Liteavvarje]

One or two slices on the ceiling, what are you going to attach

 

[Björn Melander]

Pre-drill 6 mm and then use Fischer GKM. Supports 20 - 25 kg.

 

[-MH-]

It is 2 x 22mm copper pipes with water in them. Fixed every 1 - 1.5m approximately. They weigh about 1kg/m including water.

Couldn't find any GKM with a long enough screw, the clamp is about 20mm thick.

 

[Liteavvarje]

A disc in the ceiling then, a bit thin for different fittings, but use Rawlnuts, a rubber expander that swells up like a ball on the top side. Just drill first with the right size, very carefully when passing through so the plasterboard doesn't break on the top side, and tighten well.

 

[-MH-]

The family was passing by Jula, so I purchased Hard Head plastic drywall anchors. 10 for 30:-, and a pack of longer screws. Very satisfied.