Roof Gutters How Much Pitch

Hold one end of the level against the roof level it and then measure the distance between the roof and the underside of the level at its midpoint which gives you a 12 inch run.

Roof gutters how much pitch.

Or you can slope the gutters down from each end toward a single downspout placed in the middle of the run. For gutter runs longer than 40 feet it s best to pitch the gutter down from the middle to a downspout at each end. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. However you can only use this pitch with built up roofing or specialized synthetic roofing.

The steeper a roof s pitch the more windblown rain it can collect. That said gutters need to be completely level from front to back or water could spill over either edge. You can measure pitch with a 2 foot level and a tape measure. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

Roof pitch is very important for right roof gutter sizing. See the image below for more explanation on rise run and pitch. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. A 12 in 12 pitch is a steep 45 degree angle roof.

Note the measurement as you will need it later. Weather bureau records the maximum rainfall that could possibly happen in a 5 minute period in inches per hour for various regions. The gutter slope also called the pitch is the amount the gutter tilts down to let rainwater flow out of it. You can measure pitch with a 2 foot level and a tape measure.

If gutters don t slope water gathers in them. Measure down 1 inch past the first measurement and mark it with a pencil. The steeper a roof s pitch the more windblown rain it can collect. Next place a ladder at the left side of the house and measure from the roof down to the gutter.

To ensure that gutters drain properly make certain they slope inch for every 10 feet toward a downspout. 12 in 12 or higher 1 3 9 in 12 to 11 in 12 1 2 6 in 12 to 8 in 12 1 1 4 in 12 to 5 in 12 1 05 flat to 3 in 12 1. 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. Then slide the ladder to the other end of the gutter and measure down from the roof to the gutter.

Roof pitch roof pitch factor. Gutters should slope an inch or two for every 40 feet.