Minimum Gutter Pitch

Increasing the pitch increases a gutter s handling capacity but the gutter may look askew over a long run.

Minimum gutter pitch.

Place the line spirit level on the string. From the table above a gutter with diameter 100 mm 4 inches can be used. This means that your gutter should be a half inch lower in height at every 10 foot mark until you reach the downspout. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

The downspout can be 75 mm. Even though they look level from a distance gutters should be pitched slightly from one end to the other. 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. 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. Use the bubble on the line level to make sure the line is level the length of the gutter area. The standard is about inch per 10 feet. Secure it with eight pop rivets or sheet metal screws.

However you can only use this pitch with built up roofing or specialized synthetic roofing. 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. Cut a triangular section from.

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. Gutters should slope an inch or two for every 40 feet. This brings up another important rule to keep in mind. Sorry to see that you are blocking ads on the engineering toolbox.

Wrap the aluminum strip tight around the underside of the gutter. Working out gutter slope as a general rule gutter slope is set at 1 4 inch per 10 feet of guttering. This means the downspout end of the gutter should be set 3 4 of an inch lower than the other end. All guttering must slope toward the nearest downspout.

The standard slope for rain gutters is half of an inch for every 10 feet. For example if the gutter is 16 feet long the end near the down spout must be 1 inch lower than the starting end.