As we have inspected it every year when cleaning and applying the 303, we have never found any soft spots and there are no interior stains in the ceiling and having it stored under cover when not in use for most of its life, has really prolonged its normal life compared to what it would normally look like if having been on the road these years.
Other than the bubbles, the roof looks like new: we have just started using a conditioner that is produced by the Rubber Roof Manufacturer, think it might be an improvement over the 303 stuff, and less expensive.]
Originally Posted by BigBaron
Yes, but if it doesn't leak, leave it alone. I used to do commercial rubber membrane roofs and found it's best to wait until it's bad. It's probably just the wood outgassing.
Can you inspect the underside for water stains? Leaks can travel a surprising distance under a membrane.