One foot of 5 k style gutters holds 1 2 gallons of water.
Roof square footage per downspout.
Labor costs vary based on the type of underlay at 0 15 to 0 22 per square foot.
Doubling the number of downspouts halves the required capacity for each.
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.
8 inches and you have an 8 in 12 pitch.
A large roof is going to move a lot of water which means the downspout locations may need to be adjust to compensate.
There is a range of different solutions for roofing underlay some are tacked or stapled while others are self adhesive ranging in price from 0 18 to 0 49 per square foot for materials only.
Vinyl gutters cost 2 to 5 per linear foot.
A house in chicago has a roof whose actual drainage area is 1 000 square feet.
Pitch measurement method 2.
Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed.
If this distance measures 4 inches you have a 4 in 12 pitch.
One foot of 6 k style gutters holds 2 0 gallons of water.
The 6 in 12 pitch factor 1 1 multiplied by 1 000 yields an effective area of 1 100 square feet.
To do that simply multiply drainage area calculated earlier by roof pitch factor and rainfall intensity.
After you have calculated the square footage use following calculations.
For a 2 400 square foot roof you can expect to spend 792 to 1 704.
Primary cause for water spillage is debri in the gutter.
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.
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.
Gutters come in a wide range of materials the cost depends on which you choose.
Size downspouts to fit the gutter.
For the vast majority of rains gutter and downspouts sizes considerably less than recommended will do the job.
Multiplying that number by the local maximum rainfall intensity 6 8 inches per hour yields an adjusted square footage of 7 480 square feet.
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.
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.
