Minimum Gutter Pitch

The standard slope for rain gutters is half of an inch for every 10 feet.

Minimum gutter pitch.

This brings up another important rule to keep in mind. Form strip miter joint at corner cover the joint between two lengths of gutter at each corner with a strip miter a 3 inch wide strip of aluminum. Use the bubble on the line level to make sure the line is level the length of the gutter area. Cut a triangular section from.

For example if the gutter is 16 feet long the end near the down spout must be 1 inch lower than the starting end. However you can only use this pitch with built up roofing or specialized synthetic roofing. This means that your gutter should be a half inch lower in height at every 10 foot mark until you reach the downspout. Place the line spirit level on the string.

Secure it with eight pop rivets or sheet metal screws. Wrap the aluminum strip tight around the underside of the gutter. The downspout can be 75 mm. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

Working out gutter slope as a general rule gutter slope is set at 1 4 inch per 10 feet of guttering. 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. Next place a ladder at the left side of the house and measure from the roof down to the gutter. All guttering must slope toward the nearest downspout.

Even though they look level from a distance gutters should be pitched slightly from one end to the other. Increasing the pitch increases a gutter s handling capacity but the gutter may look askew over a long run. A roof with area 45 m2 can be drained with a gutter with slope 1. For example if you have 30 feet of guttering the calculation is 1 4 x 3 0 75 i e.

From the table above a gutter with diameter 100 mm 4 inches can be used. Multiply the number of feet by 1 16 inch to determine the total slope the gutter requires. If the pitch is too gentle water will just fill up in the gutters until it overflows and a too sharp pitch isn t aesthetically pleasing. Gutters should slope an inch or two for every 40 feet.

Most contractors tend to set the slop at one quarter inch per ten feet of guttering. This means the downspout end of the gutter should be set 3 4 of an inch lower than the other end.