How Many Downspouts On Long Gutter Run

Determine the length of the gutter run how many downspouts your system will require and how long those downspouts will need to be.

How many downspouts on long gutter run.

Write out all of your measurements. If the run is more than 35 feet long some specialists recommend installing the high point of the system in the middle and sloping the gutter downward in both directions to downspouts on both ends. Most gutter installers add a downspout about every 20 or 30 feet of gutter although depending on the slope of your roof and the rooflines you may need more. Increasing the pitch increases a gutter s handling capacity but the gutter may look askew over a long run.

The standard is about inch per 10 feet. Or 3200 square feet of roof is calculated as 3200 1200 2 67 rounding up you would need 3 3x4 downspouts one 2x3 downspout will drain 600 sq. Smaller gutters may need extra downspouts to make up for their low volume. One 3x4 downspout will drain 1200 sq.

If your old gutter system worked well you may find it easiest to simply copy that exact system and replace it with a new one keeping the old downspouts in the same area etc. Increase the pitch of the gutter. Large gutters can hold more water and may not need as many spouts. Heavy rainstorms put a lot more pressure on gutters.

The above recommendations assume that you have properly sized downspouts every 40 feet. Gutters come in many sizes. Particularly wet climates could require better drainage systems than relatively dry climates rainy.