Marley Modern Tiles Colour Fading/Surface Wearing Away

[emmaamme]

Hi, I'm in a 9 yr old bungalow which is covered in Marley Modern grey tiles. Some of the tiles appear to be changing colour which i'm guessing is the surface wearing away.
These are the worst ones (see photos).
Other tiles are showing the same signs but a lot less severe.

Will this affect the waterproofing of the tiles and should I be worried or is it just natural wear & tear? Has anyone experienced similar? Thanks.

 

[jj4091]

That's not the colour fading it is algae or lichen forming on the tiles. Is that a shaded section of roof, common in that situation

 

[Wayners]

I think that's just weathering.
I didn't think it was growth.
Maybe I'm wrong so try some wet and forget.

We've had some brutal summers and rain.

Many hot countries paint roof tiles much to my mates amusement when the builder asked what colour did he want the roof painted.
Maybe in a few years if it bothers you to get yours done if they don't clean up.

Try cleaning though.
Post how that works out