Condensation in joists in flat roof

[Luke Dilorenzo]

Just curious. I believe I have picked the route I’m going to take however I wanted others opinions before pulling the trigger. Like the title says, roof is flat TPO style with no crawl/attic. Due to poor ventilation moisture has accumulated in the joists/purlins. One spot habitually shows signs of moisture on drywall ceiling. (Not a lot, spotting). I planned on putting truss and shingle on in the future however did not expect this so soon.

I plan on basically “running till the wheels fall off” so to speak (patch drywall as needed) until I can work the money to do the full truss and shingle show. Roof is only 8 years old. Curious if other would handle this the same I plan to.

Thanks in advance!

[David Tyrawa]

If there is room between the insulation and roof deck you can add mushroom vents. It doesn't vent like a pitched roof but it will get some of the moisture out. Also if your getting water stains in high moisture areas like bathrooms install some strong exhaust fans. It will help draw the moisture out. It's still a big under taking but it may be cheaper to tear dry wall ceiling out and build the ceiling down to get more insulation in. It's just a thought