A friend is having an extension built and the cavity wall and insulation is not yet completed and was open to the elements at the top. Due to the weather the builders have stopped work but did not cover the top of the wall. My friend was concerned that the insulation would get damp and he was concerned whether it could cause problems once the wall was completed. I said I didn't think it would be an issue as you could expect dampness from the mortar etc and this would dry out over time. But what do the group think? Should he get the builders to replace the insulation.( probably easier said than done due to the wall ties.)