23/10/2026
What can cause white marks to appear on your sandstone?
In this case a roof repair with incorrectly fitted guttering caused rainwater to saturate the sandstone and this was the result.
Front of house re cleaned, salt residue chipped off and now the cause of the issue has been resolved it’s less likely to happen again.
Remember sandstone is a natural product and as such these things can happen due to pe*******on of water if it has nowhere to go.