To build with stone and lime mortar you need:
1)LIME. This brand (spare the irony) is made in Germany. We chose NHL 5 (natural hydraulic lime) because of our location a few miles from the Atlantic coast being wet and windswept, walls need strong stuff. Lime is more expensive than cement, but by its benefits it should pay for itself. We order two pallets from The Traditional Lime Company in Carlow.
4)STONEMASON. One Rónán Crehan ready, willing and able, and with knowledge of working with lime.