I did an inspection of a 2/12 roof today with my thermal camera and moisture meters. The current owner found 4 leaks, and I found 6 or so places of water intrusion.
The roof coverings are owens corning 50 yr with Sure-nail. They put ice guard on entire roof surface before shingle installation according to manufacturers installation. Entire roof replaced in Sept 07. Previous roof was old 3-tab that never leaked.
The problem appears to be the water is going under the shingles, due to low slope, and running into nail space to drain onto sheathing.
I also very much doubt that the problem is nails through the ice and water shield, especialy on a new roof, the product is designed to have a “memory” so that it closes back around nials and screws, thats the whole point of it.
My guess would be either a very poor installation of the Ice and water layer, or that it is missing in some key areas like flashing locations.
When I got to the inspection they were removing some of the shingles to replace. The owner showed me the Owens Corning installation instructions that he printed for his roofer to install. He made sure that the roofer, his friend, followed his instructions.
The leaks were coming form all over the roof surface not any areas with flashing, only 3 terminations on this affected side of roof. Ice damming has not hapened as we have not had snow yet.
They owner just called and he told me he is going to cover the entire roof with metal standing seam. Quite a $$$. not sure who is going to pay.
I’ll update when I get more info.
Thank you all for your help.
The roofer was a friend of this guy who was a carpenter for 20 years with the union here in SW PA. In some of the rural parts around here, when your a teen in high school you take carpentry classes at a Tech school. That is just how things have been for 40-50 years. Most of these guys in the rural parts are quite skilled at carpentry. However, this guy is not a true roofer.
Yes Will, the kid got a free roof, from a trade. Nuff said!!!
This young mans father traded equiptment for the roof materials and installation, I do not what type or quantity.