Quote:
Originally Posted by NULarry B
Jack
What is the white covering on the roof in picture 136?
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The roof surface is a continuous sheet of pebbled fiberglass laminated as the exterior of the roof. The roof is a laminated structure - inside to outside: soft touch padded vinyl interior, luan, 2" high density Dow foam with the AC ducts cut into it, topped by 2" of foam, then luan, then the fiberglass exterior. This is all 100% glue covered between layers and pinch rolled. It is a very strong and stiff one-piece structure. It feels like walking on the ground
The top 2" of the high density foam is laid over the AC ducting so that heat from outside does not affect the ducts and returns (or has minimal effect).
The edge seams of the 2015's are covered with a trim strip that you see that cleans up the screw heads and caulk over them. It is an appearance improvement.
The roof is flat side-to-side, unlike many RVs that have a arched roof. Drainage is to the ends from a slight peak oriented over the area of the stairs inside. This has many advantages, most significant of which is the laminated structure. It also has a disadvantage in that "some" water can pool at the seam tape for the end caps - there is no side-to-side runoff area. With the condensate drains for the air conditioning units that route water directly to the ground this is only rain water and it evaporates fairly quickly. But it does require that you maintain your endcap sealing. Which should be done anyway. It is rare to have an issue with this, but it is different and does bring up questions. One advantage is no side gutters and no water runoff on the sides. Like anything else, there are tradeoffs to each construction technique.
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