Repair of pointing joints between coping stones

Along a long run of coping stones the pointing/joints are shrinking away and a little bit crumbly. I intend to have the coping stones replaced next year but meanwhile there is a slight leak into the room below this terrace wall.

How can I make an effective temporary repair to these joints please?

The coping stones are sound and very solidy in place. I'd like to just fill the gaps for now.

Should I use a cement mix, gripfill, caulking, glue, chewy,... ?

Any advice to get me by and dry until March/April would be very much appreciated.

parapet walls!!


pointing with compo (mortar or sand/cement) is the best option unless the joints are unfeasibly narrow.

well that's the first time an emoticon made me jump - I was really quite scared

thanks for telling me the name of the offending part of the wall - this is progress for me

the joints are quite thin all along the gaps between the big coping stones.

If sand and cement is too thick - what else could I squeeze along those cracks please?