Re: I'm truly at a loss for words...REALLY!
This is unbelievable. What's holding those shingles down; roofing tar? The roof doesn't have enough pitch to let the shingles drain properly, so water will accumulate under the tabs. One freeze will lift the outer edges and allow even more water under the tabs. A second freeze will have them lift right off the roof. The next breeze will blow them all away. What he should have done is to put up a pitched roof made of 2x4's and A/C plywood, with the shingles properly nailed and copper flashing at the edges. Then he'd be able to properly insulate the "attic space" between it and the cabintop and lower his winter fuel bills. He'd have to be careful about electrolysis with the copper, but it would be manageable.