The white you see is frost on the nails and plywood.....the sheathing is soaked and you can see that by the darker areas on the sheathing.
Also on this part of the roof there is maybe 1/8" of snow on top of the shingles.
You can also see in this picture above that the moisture has a definite ending point.
Sorry about the angle of above pic, but this is the flat part of the roof (left angle side of the pic). The sheathing here is wet in areas (large areas) but not the nail heads here. And it is not exactly next to the area of the sloped roof that has the moisture problem.
By the way, There were two different roofing contractors on this roof. One did the entire roof 4 years ago and then a different one on the flat area this past summer.
My question here is, can the problem on the pitched roof be only condensation (the roofer is suggesting that about the water dripping off the nails) The Ventilation in the attic is not enough. I was quite comfortable in there and it was 8 degrees outside. Or do you think it is more of a problem with the installation.?.?
I could not see the top of the shingles because of the snow. So I don't know if the nail heads were exposed or not.
Thanks in advance on any opinions, The roofing contractor is going there tomorrow morning. 
Originally Posted By: ekartal3 This post was automatically imported from our archived forum.
Hi Dan.
Almost everytime I see frosted or rusted nail tips there is inadequate ventilation and no vapor barrier. Lack of insulation too but it appears you have that checked. I agree with Pat that soaked sheating would be from water entry. It would take a very long time before ventilation problems would completely soak the sheating if that is indeed the case. Snow covered roof and wet sheathing..don't forget your clearly expressed disclaimers here. 
Originally Posted By: dedwards This post was automatically imported from our archived forum.
You have already gotten good advice but your gut instinct has already told you too that this isn’t right. The attic should never be wet inside. I see several narrow strips of roof sheathing. Looks like a typical half a$$ install to me. If it is wet during the winter than you can bet it is wet in the summer as well. The lack of clips, the signs of moisture, and the comments from the roofer indicates to me they know they did a crappy job and are trying to cover their 6.
Originally Posted By: Jay Moge This post was automatically imported from our archived forum.
not to mention the use of a nail gun to nail shingles. too much psi and the nail head goes right threw the shingle, not enough and you get nail pops. either way it add up to a leak, sooner or later. and seeing how the actual pressur from any compressor varies as it kicks on and off at limits, you’ll never have a nail gun set perfect for every nail.
