Slope Of Roof Guttering

Calculate the gutter slope by dividing the length of the gutter needed by 10.

Slope of roof guttering.

125 mm 5 gutter 100 mm 4 downspout. The standard slope for rain gutters is half of an inch for every 10 feet. 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. 1 grade 1 cm per 100 cm run 0 125 inch per 1 ft run.

As a general rule gutter slope is set at 1 4 inch per 10 feet of guttering. 2 grade 2 cm per 100 cm run 0 250 inch per 1 ft run. 0 5 grade 0 5 cm per 100 cm run 0 0625 inch per 1 ft run. This means that your gutter should be a half inch lower in height at every 10 foot mark until you reach the downspout.

If there s standing water it s not pitched properly. This means the downspout end of the gutter should be set 3 4 of an inch lower than the other end. The minimal slope needed for proper gutter drainage is 1 25 cm 1 4 inch for every 3 metres 10 feet of gutter. Get on a ladder after a rainstorm and look in the gutter.

Gutters need to be pitched toward the downspouts for the water to flow properly. To correct this yourself you ll need to measure from the peak to the downspout. 100 mm 4 gutter 75 mm 3 downspout. Working out gutter slope.

For example if you have 30 feet of guttering the calculation is 1 4 x 3 0 75 i e. 150 mm 6 gutter 100 mm 4 downspout. If the length of the gutter is 10 5 metres 35 feet the amount of slope required is 1 25 cm 1 4 inch multiplied by 1 metres 3 5 feet which when rounded up is 2 5 cm 1 inch. You want at least a quarter inch of slope for every 10 feet.