Molly plug through "13 gypsum" with masonite board behind, String shelf

[Downhill]

Hello!

I've drilled a 13mm hole to insert a molly plug and now see that it's not air inside but wood, probably a masonite board. My thought was to use a double molly, but could there be issues if there isn't "air" after 26mm? The shelf will have a maximum load of about 3 kg.

This is happening on a partition wall in an apartment built in '71, and the goal is to put up a String shelf. The hole needs to be made at this exact spot, should I fill it and just use screws?

Grateful for help

Peter

 

[ricebridge]

Yes, you can't fit a Molly in there. Use filler and go with a regular screw that reaches into the wood.
However, first test with a screw now to see if there's wood behind the masonite, otherwise it won't hold.

 

[Downhill]

Thank you very much RB. It might be a rule I have come across, I realize, as it looks more like wood than masonite. I will try screwing and see.

 

[A-Man_08]

Drill through the hole you have and then measure the thickness of the wall, you need to fill it anyway.