Great reply Dieseldawg. Providing the description and a web site along with a picture of the finished product is very helpful. Ardvarks views are also helpful. Most of know the flashing and all the vent holes along with seams are normally the problem, but it never hurts to tell the people that are new to RV’s. The propensity of RV’s to start leaking after only a couple years is why I am not a fan of extra stuff that require holes to be anywhere on the RV. Ladders, roof racks, solar, sky lights and awnings are all non essential items that IMO do more harm than good.