Multiplying that number by the local maximum rainfall intensity 6 8 inches per hour yields an adjusted square footage of 7 480 square feet.
Roof square footage per downspout.
A high slope moves water more quickly and if gutters have trouble dealing with a lot of water in a short period of time an extra downspout can alleviate that issue.
On a ladder beside the roof place the level a foot or so up the roof hold it level and measure from the 12 inch mark on the level s bottom straight down to the roof.
For a 5 inch k style gutter the square footage should be up to 5 500 sq ft and for a 6 inch k style gutter the square footage should be upto 7 900 sq ft.
Labor costs vary based on the type of underlay at 0 15 to 0 22 per square foot.
For the vast majority of rains gutter and downspouts sizes considerably less than recommended will do the job.
One foot of 6 k style gutters holds 2 0 gallons of water.
After you have calculated the square footage use following calculations.
Primary cause for water spillage is debri in the gutter.
A large roof is going to move a lot of water which means the downspout locations may need to be adjust to compensate.
If this distance measures 4 inches you have a 4 in 12 pitch.
Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed.
The 6 in 12 pitch factor 1 1 multiplied by 1 000 yields an effective area of 1 100 square feet.
Vinyl gutters cost 2 to 5 per linear foot.
Intensity lasting calculated roof area intensity lasting calculated roof area 5 minutes drained per 5 minutes drained per downspout area downspout area in hr mm hr sq ft sq m in hr mm hr sq ft sq m sq in 100 sq mm sq in 100 sq mm 7 4 187 160 2 30 10 4 265 110 1 70 7 1 181 170 2 40 9 9 251 120 1 70 1 8 46 660 9 50 3 1 77 390 5 70.
Multiplying that number by the local maximum rainfall intensity 6 8 inches per hour yields an adjusted square footage of 7 480 square feet.
Metal gutters vary in price from 6 to 12 for aluminum and 9 to 20 for steel to 25 or more for high end copper.
Doubling the number of downspouts halves the required capacity for each.
Pitch measurement method 2.
One foot of 5 k style gutters holds 1 2 gallons of water.
It doesn t take many sticks leaves or needles to impede the proper flow of water in the eavestrough.
A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour.
Therefore this roof should be equipped with 6 inch k style gutters.
Two hundred feet of gutter can cost anywhere between 660 and 4 500.
Size downspouts to fit the gutter.
8 inches and you have an 8 in 12 pitch.
For a 2 400 square foot roof you can expect to spend 792 to 1 704.
To do that simply multiply drainage area calculated earlier by roof pitch factor and rainfall intensity.
