this might be of use. https://www.rhs.org.uk/advice/profile?PID=258 "but common or English ivy (Hedera helix sp.) supports itself by aerial roots and where these penetrate cracks or joints they may cause structural damage. Sound masonry is unaffected."
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https://www.rhs.org.uk/advice/profile?PID=258
"but common or English ivy (Hedera helix sp.) supports itself by aerial roots and where these penetrate cracks or joints they may cause structural damage. Sound masonry is unaffected."