Quote Originally Posted by Retread68 View Post
I was just up on my roof for the purpose of investigating why all of a sudden my black water tank is not venting properly; actually not venting at all ! SURPRISE ! - - My roof looks exactly like the picture in Yarrly's post. My roof has chicken-pox !! First time I have ever seen this in person; and I'm old.
I have the same thing occurring...small blisters and bubbles that are in the membrane itself, not under the membrane. This area also feels sticky, tacky.