even more simple, dig out the mortar in a couple of joints and replace with these? DISCLAIMER: I am not in the building line but I see that the builder has used a number of them on our recent rear extension.
https://www.amazon.co.uk/Terracotta-Ventilation-Cavity-Retaining-Garden/dp/B00H5MFDMG
Thanks for the link to these.
@hugo7 started
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even more simple, dig out the mortar in a couple of joints and replace with these? DISCLAIMER: I am not in the building line but I see that the builder has used a number of them on our recent rear extension.
https://www.amazon.co.uk/Terracotta-Ventilation-Cavity-Retaining-Garden/dp/B00H5MFDMG