
To answer that question, you will need to determine where the moss is growing. For example, if you notice it is growing in and around the gutters and downspouts, it may be causing them to clog up which would prevent water from draining properly. If this is not cleared it could cause the home to have structural issues.
Another thing you should consider is the building materials used for the roof’s construction. If the shingles are made of clay or stone, it is unlikely that moss growing on them will create any problems. It is important to remember, however, that moss retains a great deal of moisture which could have a negative impact on the structure of the roof so you may decide to err on the side of caution and remove the moss anyway.
Removing moss from a roof should be done correctly. There are some methods used for cleaning roofs that could actually do more damage than the moss itself so do your research and choose the best company to take care of it.
If you are unsure about whether moss will damage your roof it may be best to have it inspected. This way you can discover the condition of the roof and find out if the moss is creating any problems.