Gutter Pitch Angle

Technically speaking the slope also called the pitch of the gutters is the amount by which the gutters slant downward along the path of the water flow.

Gutter pitch angle.

If gutters are not sloped enough the water will simply pool in the gutters and eventually spill over their sides. 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. Gutters need to be pitched at a 5 degree angle. Gutter can be run level for appearance but addition downspout will be necessary see section on proper gutter and downspout sizing.

There s no hard rule on the angle of the slope. If you have a length of gutter that is more than 35 feet long the center point should be the highest elevation and each side should pitch down toward the downspouts on either end. If the run requires two sections of gutter overlap them by 8 inches and use a 3 8 inch long self tapping stainless steel screws or pop rivets in two rows of four each to join them. There are two factors that go into determining gutter position on the eave the pitch of the gutter and the roof slope.

This allows the water to flow gently but. As long as there is enough slope the water will naturally run out. For example if you have 30 feet of guttering the calculation is 1 4 x 3 0 75 i e. Place the line spirit level on the string.

For example for every 10 feet of gutter they need to drop 1 2 inch from the high end to the downspout. Calculate the gutter slope by dividing the length of the gutter needed by 10. A good guideline is that the pitch should cause a decrease somewhere between 1 to 2 inches over a 40 foot run. Gutters should be placed below the extended roof line so that snow and ice can slide clear.

Measure from the roof edge at both ends of the gutter if you want to be sure. 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.