Repairing Cracks in External Rendered Walls

At Logic Plastering we often get queries about repairing cracks in external rendered walls. This is a typical query from a customer who had moved to his current house 3 years ago:

“We were warned that the render was poor when we moved in. It looked OK, though, until recently when cracks have started appearing. I’m just wondering whether it’s possible to repair the cracks, or will I have to replace the whole lot? It looks like it’s a smooth, cream coloured render that’s been used – not sure what it’s called though”