Are there any blocks that spiders cannot climb?

I’m building a spider spawner exp farm, and I have everything planned out.

Now the only thing is to build it. But what material should I use?

Are there any blocks that a spider (either type) just cannot hold on to the sides of?

My farm should function if there are none, but it would be a huge boost to convenience and efficiency if there are any such blocks.

Keep in mind that this question is not the same as this question which just asks how to make your house safe from spiders.

Answer

Cover the walls with signs. Spiders can’t climb a wall if it’s covered in signs. I just tested it.

Attribution
Source : Link , Question Author : Mr Smooth , Answer Author : Kelaris

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