I have not (YET) expierenced this problem but per the Woodalls RV-Owner's Manual the odds are I will, if I don't prevent it
Rubber roofs are nice, baring damage and with proper care they can last a long, long, long, long time, Much longer than most other roofs This is because unlike metal panals, Rubber can stretch and flex... Unless it's sun damaged.
The sun is not your friend when it comes to rubber, It dries the rubber out, this leads to cracking and Well... leaks
Of course mositure is no friend either.. Every rubber roof, or for that matter ROOF no matter what it's made of, has microscopic imprefections where mold and mildew spores can (and do) lodge, As the mold and mildew take hold they further damage the roof and cause leaks, which of course leads to more mold and mildew and finally..... Well, you don't want to be inside the rig when it reaches it's natural end (Roof collasping) but you know that... You have seen it with your own eyes.
Finally there is physical damage from low hanging branches and the like,,,, Including walking on it in some cases
So what can you do to keep the roof secure?
First, "Bright Tech" roofs (if I've spelled it right) are white, reflecting much of the sun... It's still rubber though. But this helps, They are also smoother, which further helps. But this does not eliminate the need for maintance.
So, what do you do to maintain the roof (And yes, there is a plug here for another forum member's products)
First, Regular inspections.. At least twice a year (IE: Spring and fall) Get up on the roof, do it on a nice day please, not when it's raining or you are sweating buckets due to the heat and humidity. Give it a good once over with the old mark-1 Eyeball. Make sure ther eare no holes, tears or other damage.
Also.. If you have any suspusion of possible damage (Say from a low hanging tree, or a hail storm) Make an extra trip up and inspect it
Then, again on the spring/fall schedule, Give it a good bath... Protect-all Roof Cleaner is recommended by Woodalls
Then, Just like your "Roof" (Hair) once you have shampooed, Give it a good conditioner, Once again Protect-All is recommended by Woodalls.
For more information on Protect-All products.. Just ask, but not me.. I strongly suspect there will be a post below this one telling you who the Protect-All representive is