How to install counter flashing on field stone chimney?

[sikkensuser]

How would one go about installing counter flashing on a field stone chimney?. The mortar lines are irregularly staggered owing to the differently shaped and sided stones, making it difficult (maybe impossible?) to cut a groove in the mortar allowing the flashing to be tucked in.

 

[CraigFL]

This is difficult but if you want it to look professional you could use lead or copper flashings, malleable enough to conform to irregular mortar lines. You could also cut a straight line through mortar and stone too.

 

[dmc@RCR]

Lead is the way to go for flashing a fieldstone chimney. Malleable so you can follow the stone morter lines.
This webpage has a good example; Stone Chimney Flashing

 

[itsreallyconc]

we're professional & use hand grinders, diamond blades, levels, chalklines, & soapstone,,, usually lead or copper 'cause our work's not cheap,,, not much is impossible altho you may have to adapt :beer: