Ranch house with roof of 5 12 pitch 48 feet long with a small gable extending out over a porch at one end.
Gutter slope per foot.
Gutter should be pitched 1 16 or greater per foot for proper drainage.
Slope 1 8 inch per running foot.
Plenty of rain but not usually much snow.
Most contractors tend to set the slop at one quarter inch per ten feet of guttering.
For rainy climates where gutters will handle a larger amount of water for long periods they should have a maximum distance of 18 inches apart between them.
This means the downspout end of the gutter should be set 3 4 of an inch lower than the other end.
So what s the ideal amount of slope for your gutters.
Modern roofing care and repair creative homeowner press.
So if you have a 25 foot section of guttering you should set the downspout end of the gutter 5 8 of an inch lower 1 4 x 2 5 5 8 than the other end.
For example if you have 30 feet of guttering the calculation is 1 4 x 3 0 75 i e.
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.
Increasing the pitch increases a gutter s handling capacity but the gutter may look askew over a long run.
To ensure that gutters drain properly make certain they slope inch for every 10 feet toward a downspout.
There are two factors that go into determining gutter position on the eave the pitch of the gutter and the roof slope.
The standard is about inch per 10 feet.
The standard slope for rain gutters is half of an inch for every 10 feet.
This means that your gutter should be a half inch lower in height at every 10 foot mark until you reach the downspout.
Max run per downspout of 40 feet.
I live in climate zone 4a in virginia.
As with gutters a downspout s capacity must match or exceed the expected runoff.
If you live in a warm place with sporadic rain you can hang gutter hangers close to the middle of the gutter with a spacing of no more than 36 inches or three feet apart from the center.
1 sq in downspout cross section per 100 sq ft of roof drained.
As a general rule gutter slope is set at 1 4 inch per 10 feet of guttering.
At the ends of the gutters are 4 inch diameter corrugated aluminum downspouts 1 75 per linear foot which were ordered in white to match the house trim.
Gutter can be run level for appearance but addition downspout will be necessary see section on proper gutter and downspout sizing.
The above recommendations assume that you have properly sized downspouts every 40 feet.
