Condensation or Leak

[Brian E. Kelly]

Without being there could be a combination of both leak and condensation. Now if the roof was recently repaired perhaps the moisture from the leak will go away. That sure looks like condensation to me and better attic ventilation couldn't hurt.

[sploof]

Are there any "misplaced" outside vents that could be putting moisture into the attic through the eaves?

[Joe Funderburk, CMI]

Looks like a leak to me. I probably would have said: "Roof sheathing is water damaged at XXX. An active leak is thought to exist. Observation of the roof during a period of prolonged rain is recommended. We also recommend an evaluation and repair by a licensed roofing contractor."

[Joe Funderburk, CMI]

Originally Posted by bmahar

No attic vapor barrier only blown in insulation directly onto the sheetrock supported by rafters.

As for the Ventelation It did not look like enough. I am working on determinaing if indead this is a factor at this time.

I never see vapor barriers in new construction with blown insulation. My view is that the vapor barrier would trap the moisture next to the ceiling and it would condense and cause ceiling stains. I wouldn't want a vapor barrier in the attic of my house. If the attic has good ventilation, there shouldn't be any condensation.

[Kenton H. Shepard, CMI]

The situation sounds like a leak but the picture looks like condensation.

If it's the master BR and they shower with the door to the bathroom open and no have no ventilation, a recessed lighting fixture might route water vapor to this area where it could condense on the sheathing, especially if there were a big difference in temperature between room and attic.

If this isn't the case, that much water must come from a leak.

[tmels]

my guess is a leak. I have seen some very bad condisation leaks before but not that bad this time of year.

[gbeaumont]

Originally Posted by kshepard

The situation sounds like a leak but the picture looks like condensation.

That is the problem with OSB, it soaks up water like a sponge, but when it it saturated it looks like condensation as the moisture takes multiple routes out of the fibers.

Regards

Gerry

[Carl A. Brown]

Did the roofers put felt on?