How many downspout installations should your gutters have.
How many downspouts per foot of gutter.
The incline should be approximately one inch for every sixteen feet.
One 3x4 downspout will drain 1200 sq.
The average cost to install 175 feet of seamless aluminum gutters with six downspouts and six corners is 1 650 to 2 475 or between 6 and 15 per foot add 1 per foot for each additional story and 0 50 per foot for removing and disposing of your old gutter system.
Galvanized versions are treated to resist corrosion.
At 8 19 per linear foot steel gutters and downspouts are as sturdy as copper for a moderate price.
For especially long gutter runs of 40 feet or more the slope or pitch should start in the middle diverting the water to a downspout at each end.
Rectangular downspouts move slightly less water at 600 square feet for 2 by 3 inch or 1 200 square feet for a 3 by 4 inch downspout.
The standard is about inch per 10 feet.
Multiply the number of downspouts by square footage of each.
As with gutters a downspout s capacity must.
For a homeowner of a 1 500 square foot home the average cost for sectional gutters ranges from 1 065 to 2 256 for 160 feet of gutters or 7 12 per linear foot depending on the material of gutter installed.
Size downspouts to fit the gutter.
Cost of steel gutters and downspouts.
There are many more important factors that can change this broad rule.
Increase the pitch of the gutter.
Average seamless gutters cost.
The above recommendations assume that you have properly sized downspouts every 40 feet.
Increasing the pitch increases a gutter s handling capacity but the gutter may look askew over a long run.
Two hundred linear feet of copper gutter plus five downspouts at an average of 10 feet each will set you back at least 6250.
3200 square feet of roof is calculated as 3200 600 5 33 rounding up you would need 6 2x3 downspouts 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.
Doubling the number of downspouts halves the required capacity for each.
The standard is about inch per 10 feet.
As with gutters a downspout s capacity must match or exceed the expected runoff.
Increasing the pitch increases a gutter s handling capacity but the gutter may look askew over a long run.
A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour.
The highest tip of the guttering should gently slope downwards to end at the downspout.
If we have to sum it up in a single rule gutters need a downspout around every 30 to 40 feet.
Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed.
