A little moss shouldn't be much a problem for your roof (although it can look ugly), but a lot of moss can retain water which which can cause the roofing materials to rot.
Furthermore, the water trapped by the moss collects in gaps between your roof tiles, and as that water freezes and thaws it can push the tiles apart.
It also prevents good run-off from your roof and clogs your gutters and drains with debris.
But the roof can easily be damaged (as well as the workman) if the wrong methods are used to remove the moss. That's why we don't recommend cleaning the roof yourself. JSC-Cardiff have over 25 years experience working on roofs.
So whether you're a domestic or commercial customer, if you're looking for roof cleaners in Cardiff, fill out our online enquiry form or call us on 07577 644 018 for competitive rates and a clean, problem-free roof.