Had to edit my post as 1 8 is way too much.
Correct pitch for gutters.
If gutters don t slope water gathers in them.
If gutters slope too severely they don t hold water and water could splash over the sides in heavy rain.
If the pitch is too moderate the water won t be able to reach the downspout thus.
For a 30 foot gutter thats 1 7 8 inches of crown and ive never done that much.
Gutters need to be pitched at a 5 degree angle.
But the correct answer is it depends.
The gutter slope also called the pitch is the amount the gutter tilts down to let rainwater flow out of it.
It will stay in the gutter until it overflows causing leaky gutters and pooled water all over your home s siding entrance or garage.
However for gutters to function correctly they require a slight slope called a pitch which causes rainwater to flow to the downspouts.
The amount of collected water increases until it spills over the sides of the gutter.
Gutters need to slope towards the downspouts in order to function properly.
In theory if your gutters are dead level the ice and mud wont be very deep.
If the gutter is too level it will hold a lot of run off water and risk becoming too heavy for the supports to handle.
Myself though i always pitch my gutters at least some minimal amount.
Gutters play an important role in keeping your home structurally sound by directing water away from the foundation of the home.
For example for every 10 feet of gutter they need to drop 1 2 inch from the high end to the downspout.