Apologies for asking this, but googling the group is giving me a massive information overload. There must be thousands of posts about repointing old wall, many of which contradict each other.
The situation is that I need to repoint a section of of wall of my 1901 end of terrace house (in Leamington Spa if that helps).
Looking at the wall, the bricks seem modern-ish - by which I mean that the surface looks hard, almost shiny and the edges are well defined (except the ones that have spalled below the DPC !).
Areas of mortar seem to have been replaced already in what looks like concrete mortar - mid grey, very fine sand, very hard, can't press a palette knife in at all. Under this is a much darker, much softer mortar which I'm assuming is water damaged since you can more or less sweep it out with fingers.
Finally, at little higher up there looks like the original mortar (untouched). Dark grey, almost black, with large sharp-edged 'sand' particles up to about 2 mm across, you can just about scratch it with a palette knife.
So what is safest mix to use to repoint ?
From the zillion post I've read, it looks as if the consensus is a 6:1:1 mix (soft sand: Portland cement: Hydrated lime). This would be softer than pure cement mortar and more convenient to make up that the Second favourite, lime mortar (3 or 4:1 soft sand:lime putty).
Definitely to be avoided unless your certain the bricks are modern is the cement:sand mix sold as pre-mixed mortar in the sheds.
I'd like to avoid the lime mortar option (for reasons of time), so will the 6:1:1 mix be okay ? Does anybody have anything to add ?
Thanks,
Phil Young