Slate Roof Repairs. On slate roofs it is important to keep the roof maintained as these roofs are relatively expensive to replace. The most common Slate Roof repairs are replacing slipped or broken slate; replacing soaker flashings that fit under the edges of a slate roof; replacing rusted valley gutters and re-bedding and re-pointing ridge capping. G-Force Roofing Services Sydney Inner West specialise in these repairs and more and can help you keep your slate roof in sound condition.