Have a farmhouse in upstate ny and would like to repoint the interior of the basement foundation. The house was built in 1835 and was told that lime and sand was used when laying stone foundation. Completing curtain/french drains this summer to insure a dry basement. Anyone know what type of mix to buy or create that will be compatable with the original? Have heard that commerically available mortar is too stiff and will cause problems in the long run. Any experience/advice is appreciated.