Our exterior courtyard wall is shedding large pieces of render. How is it repaired with mesh so it doesn't crack again?

Exterior courtyard and boundary walls absorb moisture both from rain and from the ground. Once old renderRender (plaster)A layer of mortar (sand, cement or lime, and water) spread over brick or concrete to give a wall a straight, sound surface ready for paint or tiles. debonds from the brickwork and falls away, simple spot-patching usually cracksCrackA split or gap in render, concrete, a wall, a coating or wood. Fine cracks are usually only on the surface; ones that grow, keep reopening or run diagonally need attention. again along the joint between old and new mortar.

On this courtyard wall, all hollow, blistered sections were hacked off first and the deeper voids filled with new mortar. Fibreglass reinforcing meshReinforcement meshA mesh or fabric, usually glass fibre or polyester, set into render, a coating or liquid waterproofing to hold it together and stop cracks from opening. was then laid across the surface to tie the patches into the surrounding wall.

A full skim coatFillerA fine paste or powder that fills holes, fine cracks and dents so a wall, ceiling or piece of wood is smooth before it is painted. of fine render was trowelled over the mesh across the entire wall and, once cured, painted white with no visible joints.