Whilst not wanting to become a lime-pointing-bore (I bet there aren’t too many of those in the world) I feel another update is in order.
The tools that I ordered to help in raking out the mortar joints have disappointingly not arrived yet but the repointing tools have. I managed to break the mortar hawk as soon as I took it out of the box so it didn’t score highly for resilience, but it’s nothing a drilled hole and suitably sized bolt can’t fix. More on the pointing gun below…
Iâ€™ve tried some innovations to my repointing technique with good and bad outcomesâ€¦
Whilst despised by many as water wasting and noisy, I found using a pressure washer to clean out the joints and dislodge loose mortar before hacking out, then tidying up again with the pressure washer saves time and leaves clean, well-prepared joints ready for re-mortaring. (Sorry about the noise and wasted water).
Don’t use a cement mixer to mix lime putty and sand – it doesn’t work, you just get blobs of putty encased in sand rumbling round-and-round in the mixer. I know everyone who knows anything about lime mortar knows this one – I just had to prove it for myself.
A mix of 3-1 sand to lime putty doesn’t work in a pointing gun (an over-sized version of the sealants guns that we all know) it just compresses the mortar and squeezes out the water. I think the problem is a combination of not using a plasticiser and / or the ‘wrong type’ of sand – I just used standard building sand. As the plasticiser supplied was not to be used with lime and the instructions for the gun say not to use sharp sand I’ve hit a bit of a (stone) wall with this one. I might try messing around with the mix (less sand or a finer one). Anyone know if there is a plasticiser suitable for use with lime?
The saga continues…