How to determine gutter slope the best way to calculate the slope of a gutter run before hanging it is to use a long string and a string level.
How to slope your gutters.
You want at least a quarter inch of slope for every 10 feet.
Once the gutter is properly pitched re install the gutter brackets.
The standard slope for rain gutters is half of an inch for every 10 feet.
A gutter over 30 feet needs two downspouts.
For example if you have 30 feet of guttering the calculation is 1 4 x 3 0 75 i e.
A gutter over 30 feet needs two downspouts.
For spans longer than 40 feet it s wise to have a downspout on each end and start the high spot of the gutter in the center.
It should pitch from the middle toward the downspouts at each end.
First determine the location of each one of your downspouts.
Go to the side of the gutter farthest from the downspout and pour the water in.
Granade roofing on another awesome seamless gutter project adjusting a section of gutter to get the proper flow of water.
This means that your gutter should be a half inch lower in height at every 10 foot mark until you reach the downspout.
For example if the gutter is 16 feet long the end near the down spout must be 1 inch lower than the starting end.
Put a temporary screw at the back to adjust the pitch.
Snap a chalk line between the two and find the spots where the gutter is out of alignment.
To check the slope of your gutters you ll need a ladder tall enough to safely get to your gutter and a one gallon bucket of water.
This means the downspout end of the gutter should be set 3 4 of an inch lower than the other end.
It should run at a consistent speed down the gutter to the downspout.
If there s standing water it s not pitched properly.
As a general rule gutter slope is set at 1 4 inch per 10 feet of guttering.
To get started measure the side of the house directly under the gutter to determine its length in feet.
Pull the gutter down about 3 quarters of an inch lower than it originally was.
Then fasten one end of the string at the highest point of the gutter and the other at the spot where the downspout will be.
To correct this yourself you ll need to measure from the peak to the downspout.
Get on a ladder after a rainstorm and look in the gutter.
However shorter spans can simply slope in one direction.
Multiply the number of feet by 1 16 inch to determine the total slope the gutter requires.