Does anyone know the correct overlap that the ashphalt shingles should be at the drip edge and eaves? The roofing contactors installed the first row of shingles to the edge of the drip edge only with little if no overlap on the drip edge and the water was leaking past the eavestrough. When asked he said that it was correct for the new percentage of fibreglass shingles? With the water still leaking down the fascia they came back and installed a wider drip edge under the starter row and explained the wrong drip edge was used for the width of the fascia boards??