I hired a guy recommended by my window cleaner to render 2 upper outside walls in cement/sand whilst we were away. Received a message that the top coat had slippe off after being applied morning after scratch coat applied morning before. Both wall s are soft Cheshire clay commons. Render has done a runner leaving site it a terrible mess. On removing his scratch coat (6/1 plastering sand) found it well attached suggesting bonder/primer applied. However when removing the scratch coat found it easily crumbled like chalk when lightly tapped. It's surface was almost plain faced with poor combing in only a few areas which part explained why 6/1 top coat slipped off. Any clues on why the scratch coat should only have the strength of a digestive biscuit? Was it just the 24 hour diff between coats or were there other causes?
Top render fell off wall after 24 hours of applying scratch coat. Should it have been 48 hours?
- Thread starter Rogeranerley
- Start date
DIYnot Local
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