My fifth wheel is "in the pole barn" about 6 or 7 months of the year. During those times I don't worry about the roof membrane. During the rest of the year it sits beside the garage, in the sun and I wash it about every 2 months, sometimes more often and always apply Aerospace 303 to the entire RV (roof and exterior walls) after it dries.
Here's what DICOR has to say about UV protection in their Roof Maintenance Guide:
"Get some UV protection. Most RVers spend a lot of time in the sunny climates. The steady beat of the sun and its UV rays on your roof can cause oxidation to occur. The chalk-like powder that’s the result of this oxidation is the equivalent of a sunburn that turns your skin brown to protect it from the sun’s rays. If you feel the need to add extra UV protection, you need a protectant with a UV inhibitor like Dicor’s Roof Gard. A coating like this is also a great dirt inhibitor, as its chemical formulation makes it harder for dirt and other stuff to stick to your roof. Prior to application, we recommend thoroughly cleaning your roof (see Roof Cleaning, Page 4). Then, with your RV out of direct sunlight, simply spray it on and use a soft cloth or sponge mop to evenly spread it around. Bingo, you’re done! To maintain maximum results, we suggest reapplying Roof Gard every three to five weeks or after your next cleaning. If you have a regular cleaning schedule apply it each time you clean
the roof."
While it may not be "necessary" to provide additional UV protection to the roof membrane, I've never seen any data to suggest it's harmful. So, I suppose each of us needs to make our own decision on what we do to maintain our roof and how often we do it.....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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