Many of today s newer homes have more complex roof lines.
Pitch rate for gutters.
Hold one end of the level against the roof level it and then measure the distance between the roof and the underside of the level at its midpoint which gives you a 12 inch run.
Gutters need to be pitched at a 5 degree angle.
This means the downspout end of the gutter should be set 3 4 of an inch lower than the other end.
This allows the water to flow gently but.
For example for every 10 feet of gutter they need to drop 1 2 inch from the high end to the downspout.
In my opinion some pitch is good i d say 1 8 per ft.
Increasing the pitch increases a gutter s handling capacity but the gutter may look askew over a long run.
I have never had an issue with this as for mud and sludge build up it makes no difference it dont move inside the gutter.
The standard is about inch per 10 feet.
For example if the gutter is 16 feet long the end near the down spout must be 1 inch lower than the starting end.
To get started measure the side of the house directly under the gutter to determine its length in feet.
These rates correspond to 0 133 in min 3 4 mm min and 0 08 in min 2 mm min.
Metal roofs also shed water at a much quicker rate than an asphalt roof therefore we always recommend 6 gutters to handle the faster runoff of the water.
Steeper pitches require less clearance.
A steeper pitch will make water run down faster and require an oversized gutter.
For example if you have 30 feet of guttering the calculation is 1 4 x 3 0 75 i e.
My gutter installer keeps them close to level unless something above dumps into it.
Roof pitch is very important for right roof gutter sizing.
Multiply the number of feet by 1 16 inch to determine the total slope the gutter requires.
Gutter can be run level for appearance but addition downspout will be necessary see section on proper gutter and downspout sizing.
Gutter should be pitched 1 16 or greater per foot for proper drainage.
The steeper a roof s pitch the more windblown rain it can collect.
As a general rule gutter slope is set at 1 4 inch per 10 feet of guttering.
Increase the pitch of the gutter.
You can measure pitch with a 2 foot level and a tape measure.
