Repointing with lime mortar

03:47

The performance of repointing mortar is dependent on preparation of the substrate, application of materials and aftercare.

Here are some best-pactice key steps to follow when repointing:

• 00:02 Repointing with non-permeable, highly hydraulic material will trap moisture which will cause damage to the masonry when it evaporates.
• 00:28 The joints must be thoroughly dampened to reduce suction, improve adhesion of the mortar and prevent the mortar from drying too quickly.
• 01:12 Joints need to be thoroughly filled and compacted to avoid voids. Can be done at once with a hot-mixed and in layers for a NHL mortar.
• 01:27 Joints should be filled slightly proud.
• 01:52 With NHL, regular mist spraying may be needed to maintain damp conditions as the mortar starts to set .
• 02:52 Cover NHL with damp hessian to stop evaporation and help it cure.