If there s a drip edge installed where the fascia meets your shingles and the gutter is hung below the drip edge get some roll flashing and tuck it up under the drip edge and over the top of the gutter.
Fix outside drip gutter.
Check the downspout step 4.
If clips or brackets hold your gutters check for broken clips and loose or missing screws.
Apply silicone and reassemble.
Clean the downspout joints and replace the gaskets step 5.
If necessary use a table saw to rip the inch thick strips from a pressure treated 1x6.
Home centers sell rolls of 6 in.
If the existing aluminum drip edge is pressed tight against the fascia board shim it out with inch thick x inch wide x 8 foot long strips of pressure treated wood.
Apply plastic roofing cement step 3.
If your gutters are fastened with spikes and some spikes are loose or rusted simply hammering the spike back in isn t.
However sometimes it s enough to tighten the fasteners and then apply caulking or sealant around them to ensure that the holes are watertight.
Contractors have tried fixes like installing a lead plate in the elbow then a magnetic cushioned plate but those fixes usually just change the tone from a metallic drip drip drip to a thud thud thud sound.
Slide the wood strips behind the drip edge.
Otherwise you may end up having to have your fascia replaced along with your gutters re hung.
Patches sealants step 1.
Use tin snips to cut the gutter apron flashing roll in two 3 in.
There should be no more than a inch drop in the direction of the downspout.
Clean the area around the leak step 2.
If the gutter is close to a bedroom window this can get annoying.