How To Figiure Gutter Slope

As a general rule gutter slope is set at 1 4 inch per 10 feet of guttering.

How to figiure gutter slope.

Then fasten one end of the string at the highest point of the gutter and the other at the spot where the downspout will be. Or you can slope the gutters down from each end toward a single downspout placed in the middle of the run. How to determine gutter slope. For those you will need to add up the area of each surface within a drainage area to get the total square footage.

Multiply the number of feet by 1 16 inch to determine the total slope the gutter requires. For example if you have 30 feet of guttering the calculation is 1 4 x 3 0 75 i e. To ensure that gutters drain properly make certain they slope inch for every 10 feet toward a downspout. Compute the ponded depth and width.

Therefore this roof should be equipped with 6 inch k style gutters. The best way to calculate the slope of a gutter run before hanging it is to use a long string and a string level. First determine the location of each one of your downspouts. Hip roofs and intersecting roofs have multiple facets.

Place the line spirit level on the string. First you ll need to calculate the square footage of the gutter s drainage area. For gutter runs longer than 40 feet it s best to pitch the gutter down from the middle to a downspout at each end. For a simple gable end roof you would only need to make two calculations one for each slope.

Multiplying that number by the local maximum rainfall intensity 6 8 inches per hour yields an adjusted square footage of 7 480 square feet. This means the downspout end of the gutter should be set 3 4 of an inch lower than the other end. Determine the longitudinal slope transverse slope and manning s roughness coefficient of the gutter. The 6 in 12 pitch factor 1 1 multiplied by 1 000 yields an effective area of 1 100 square feet.

For a constant transverse slope compute the ponded depth using equation 10 1 and the ponded width using equation 10 2.