![Screenshot_20240711-190858.png Screenshot_20240711-190858.png](https://cdn.diynot.com/data/attachments/348/348820-de87d4ce7c0f16ef70f752c08ded79fc.jpg)
Hi all
I know the white stuff in photo is from lack of ventilation in loft. I have been trying to tackle this lately, it's only in one certain but (above bathroom).
Tonight I tried to wipe it with a dry trowel and it sorted of powdered away. I'm now a bit paranoid as to how unhealthy the stuff is especially as my son was climbing the loft ladder as I did this. So basically I'm wondering if anyone knows what the stuff actually is (and how harmful it is if disturbed in small quantity)?
Thanks all