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These marks appeared several years ago over the period of a few weeks on our Welsh Slate roof. We eventually got fed up of looking at them and asked a roofer who specialised in cleaning to see he could get the marks off. Try as he might, using scrubbing by hand and eventually 2 types of acid, he couldn’t get them off - all that happened was the marks became pure white on the test tile that he used the acids on. He eventually gave up and conceded defeat.
The marks are not raised in any way. If you close your eyes and move your finger over them, you won’t feel a difference between the mark and the tile.
The weird thing is that they ONLY appear on one side of the roof and our neighbour (around 100 ft away) doesn’t have them.
Does anyone have any idea what these could be?
The marks are not raised in any way. If you close your eyes and move your finger over them, you won’t feel a difference between the mark and the tile.
The weird thing is that they ONLY appear on one side of the roof and our neighbour (around 100 ft away) doesn’t have them.
Does anyone have any idea what these could be?