There should be no more than a inch drop in the direction of the downspout.
Gutter leaking behind.
The first cause is when the roofing material is installed many roofers will not extend the roofing material past the roof edging or drip edge.
1 your roof sheets have a hole in them or your screws or nails or equivalent are not watertight anymore or 2 the more common reason is where roof sheets are cut too short or they don t overhang far enough into the gutter.
If your gutters are fastened with spikes and some spikes are loose or rusted simply hammering the spike back in isn t.
Place downspouts in areas with the least amount of obstructions electrical wires hose bibs sidewalks etc.
When the roof shingles do not extend past the metal drip edge the water will suck back on the metal drip edge this is called capillary action and run behind your gutters.
Here are a few guidelines you need to follow to get it right.
Many of the solid gutter covers are design to take advantage of this water characteristic.
Water leaking in behind the facia of your roof could be caused by a couple of things.
Put downspouts in a hidden location to ensure that they don t detract from your home s overall look you can camouflage.
If you can t see anything with your naked eye you can also try pouring water into the gutter and then making a note of every spot where it leaks out.
If you re not closely attuned to the behavior of your home s water drainage system you may not notice this occurrence.
Should you notice the gutter leaking in one or a few small ish spots you ll want to carefully inspect the area to see if you can spot either of these problems.
On some homes water tends to drip behind the gutters down the fascia and soffit and then either down the side of the house or straight to the ground.