Stop earthworms doing what, Guest? I'm not sure what you're asking.

I'll guess - is it a lawn where worms are bringing soil to the surface? In that case, if a patio is laid correctly where the lawn is, then yes. You'll have to remove the lawn and create a suitable surface first, though.

Sorry if I guessed wrong.

Gives a whole new meaning to the word Gues-t don't it...

LOL. I 'guess' so, Bamboo......;-D

If you put a patio down with mortar between the flags then the worms cannot come up, if you lay it on a sand base they will come up through the gaps. It depends on whether you want the area to drain naturally or not.

I

what are the worms doing that you want to stop?

Guest, I don't think you need to worry about lack of earthworms in your garden, if that was the point. As long as there is still some of your garden which is not patio, they'll just move over by instinct. : )
Earthworms are amazing garden helpers and I don't think much stops them. They won't be grooving actually on your patio though, as they need more moisture to survive. With grass or flowerbeds they can come to the surface quite naturally when it rains.

without earth worms we would'nt have earth !! I feel a blog coming on !!!

We have paving all round our compost heap and near a water butt which is next to it Guest. In front of the butt is a water bucket which I put a thin layer of leaf debris under. When I use the bucket I find at least 6-8 worms of different types happily lurking under the bucket , on top of the paving, in the moisture of the leaf litter, they get picked up and transferred to the compost heap, and a fresh lot of litter goes under. Same as bees......much more useful than we are for the welfare of earth and its wondrous workings. They go wherever they want, cement paving or not, if conditions favour them.

three cheers for the humble earth worm, where would we be without him ?
Hip-Hip!

HOORAH !!! & in answer to your Q: Weeding we would not be here & that's fact.

I agree! lol. Hooray! :-)))))