It is recommended that gutters are placed under or 'behind' the drip edge of your roof. ... If gutters are installed below the drip edge, water can drip behind
Apply roofing cement when installing drip edge on an existing roof. Coat the flat part of the flashing that sits on the deck, using a putty knife. Lift the shingles, slide the drip edge underneath them and position it so that it extends over the gutters, then replace the shingles and pus...