Indeed, levels of moss that grow on the roof can trap drinking water under it. More than time, this water seeps via the shingles to damage the whole structure. Consequently, unless of course we have them removed on normal interval, we may have to change the entire roof a lot as well early. https://Milestono.com/2024/06/21/dos-and-donts-when-building-a-new-roof-2/