I just spent the weekend removing the plaster from the interior of the rising-damp-afflicted stone wall of my house. I'm not intending to plaster over the stone, rather leave it in its natural state with a coating of whitewash, to match the rest of the room. However, I'm now faced with the task of redoing the pointing between the stones. At present, there appears to be just crumbling sand between the stones, I did a bit of a search on the internet and it appears that if I want to mitigate future damp problems the best option would be to fill the gaps with a lime-based mortar. I read that hydrated lime might be a user-friendly option for the pointing, any views/tips? Thanks in advance.