Over the past several days built a support structure that would sit on top of my van to keep the Formosa cover and the rain off the roof. My penthouse has sagged and collects rain water in the depression. The support is a light weight and should help prevent ponding on the cover.
I used 1/2" PVC pipe to build the base structure.
Then cut up the gasket material used to waterproof electrical junction boxes that are located in wet areas. The gasket material is stuck on with silicone.
Was concerned that the distance between the upper supports would allow the cover to sag. To prevent this I wove about 100 feet of rope between the supports to prevent the cover from sagging.
I centered the support on the roof and covered it with a poly tarp.
The poly tarp was pulled tight using bungie cords. It provides a second layer of protection to the top under the cover.
Finely I installed the Formosa cover. Hopefully this belts and suspenders approach should rain off the roof.