Guttering Between Two Pitched Roofs

The standard is about inch per 10 feet.

Guttering between two pitched roofs.

The steeper a roof s pitch the more windblown rain it can collect. Pitched roofs have peaks and valleys that direct water downward in very specific directions. To correct this yourself you ll need to measure from the peak to the downspout. The valley gutter problem areas can be made worse where there are surrounding trees and associated leaves and branches that can block the valley gutters up.

For example between a double lapped plain tile and a single lapped large format interlocking tile. A bonding gutter refers to a detail which weathers the vertical junction between different roof coverings. They ll cost more and probably require a custom order through a professional installer. Get on a ladder after a rainstorm and look in the gutter.

You want at least a quarter inch of slope for every 10 feet. Roof pitch is very important for right roof gutter sizing. If there s standing water it s not pitched properly. Once you know pitch you can find your roof pitch factor in the table below.

You can measure pitch with a 2 foot level and a tape measure. Increasing the pitch increases a gutter s handling capacity but the gutter may look askew over a long run. A valley gutter is where two main roofs meet or where there is a change in roof direction. A 5 inch gap for instance is a 5 in 12 pitch.

Gutters need to be pitched toward the downspouts for the water to flow properly. 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. Increase the pitch of the gutter. Get 7 or 8 inch gutters.

The detail can be formed using preformed polymer based products traditional lead work or more modern lead replacement flashings.