Welcome Jerry Peters to the Newmar forum & irv2.
All roofs no mater what material will have some problems as they age.
Maintenance will always be required to prevent possible leaks some roofs as Newmars I have never had a problem on three coach's but I do check roof and clean during spring check.
Here is a thread on rubber roof leak control and maintenance.
Still checking on fiberglass roofs.
Not saying this could happen to Newmar fiberglass roofs
but this thread will explain.
More on
Fiberglass & more on
Fiberglass.
As you can see maintenance is needed for both types is there an advantage with fiberglass someone should answer that has one.
They both need cleaning to look good glass will cost more we'll just have to see.
Well I
found a thread on the question allot of answers but still ??????