Lay the stones with an ordinary mortar and leave the joints raked out to a depth of approx 10mm – 15mm

For the pointing mix:

• Mix pointing material supplied with white or grey cement* (see chart below) at 5:1 ratio (5 parts pointing material to 1 part cement).
• Mix approximately 1 part waterproof PVA to 5 parts water and use this to wet the pointing material.
• Wet the mixture so it only just holds together when compressed in your hand. Do not add too much water as this will result in the mixture looking a much lighter colour than the stone – a normal bricklaying mortar is far too wet.
• When pointing, use a small tool (small enough to fit into the joint) and pack the mix into the joints tightly. Trowel smooth and leave to dry. Shade from strong sunlight and rain initially.