Quote:
Originally Posted by ajk170
My in-laws 2018 Alpine has a similar issue, the strips are more spotted and not solid black and my 2105 316RL has a similar black spotting issue along the roof seams- it seems odd that we’d have to do some sort of roof coating already. Are we sure this isn’t some sort of algae that needs to be killed through some sort of cleaner- I’ve seen something similar on “sticks and bricks” roofs back east in Va, NC, SC and Ga.
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The TPO roofing membrane does not support algae/mold growth. Any "organic coating" (dirt, tree sap, bird droppings, etc) that sit on the TPO surface can (and do) support growth of algae and mold. It's the "organic dirt" that's left on the roof membrane that allows the mold to grow and it's that condition that causes the stain.
The "best practice" to prevent black spots/black stains on the roof is to keep the roof clean. While that's difficult for most of us, DICOR and Alpha Systems both produce cleaners that will help remove the organic compounds and stains, but not much is going to make a dirty, stained roof look like new again. Usually, there's not a need to apply an expensive coating to a relatively new roof and doing so might not be the best idea for longevity of the roof, but it will make it "look good for a while"...
You can download the DICOR "Rudy's RV Roofcare Handbook" here:
https://dicorproducts.com/resourcesrudys/