Originally Posted by amosnandy
Roof maintenance is one of the most overlooked maintenance items. Winnebago products are pretty good but where the roof coves meet the sidewalls do need attention. I bought my new to me 2006 Journey last year. The PO had is since 2011. I asked when the last time he cleaned and resealed the roof. He had never been up there in 10 years. 6 hours with the pressure washer and a box of TSP and it was clean again. Someone had slapped some Dicor on a few spots which is a No No on Winnebago products. They use a silicone base sealer. Cleaned off the Dicor and resealed with Geocell and all is good.
While Dicor may not be on Winnes list of sealants, it DOES work in various applications on a Winne/Itasca roof. I've used it around the vents and front and rear cap. Did that several years ago and, been in plenty of rain storms and washings, no leaks yet. I myself never thought the use of a pressure washer on an RV roof was or is needed. When we bought our '04 Itasca Horizon 36GD with the CAT C-7 330HP just over 10 years ago, the roof was in fair shape and, had at that time, zero maintenance done on it by the previous owner(s).
I proceeded to get up and scrape big blotches of Silicone off at various points that were dropped on there by installers of some of the aftermarket equipment, i.e. Kingdome and then, a good stiff brush, some dish soap and some cleanser and that roof was sparkling clean when done. After that, about two days of machine buffing and and a wax coat. Way better than new when done.