we had a new asphalt shingled roof put on our twin house, a-frame roof. The roofer is off by about 3-4 inches in the front of the house where it joins neighbors roof, where he placed a hip down the middle. The back is perfectly lined up with his in a straight line. How can this be fixed? He still has not gotten back to us as to why it is 3-4 short from center. And what if it leaks on this 3-4 inch gap as it is on our side?