Snails in the attic

I'm hoping someone might have some ideas. I have snails in my attic. This is a lived in space so really don't want them. I have not seen them but they leave the silver trail. Following that trail I put down salt along the skirting board. Did not help. I then widened the salt area. This helped. Still getting in but only as far as the extra salt. I can see snails getting into a ground floor but an attic?? Not sure what else to do. Nothing harmful as I have pets. Any ideas appreciated.
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They aren’t likely to munch through the wiring, as mice do, or burrow into the timbers, as woodworm do, or deposit piles of smelly poo, as bats do.
Poor old snails, just looking for a quiet spot to spend the winter....