Guttering Between Two Pitched Roofs

For example between a double lapped plain tile and a single lapped large format interlocking tile.

Guttering between two pitched roofs.

Valley gutters are generally considered to be a problem area. They ll cost more and probably require a custom order through a professional installer. You want at least a quarter inch of slope for every 10 feet. A bonding gutter refers to a detail which weathers the vertical junction between different roof coverings.

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 pitch is very important for right roof gutter sizing. A 5 inch gap for instance is a 5 in 12 pitch. Take one look at a pitched roof versus a flat roof and the structural differences are quite obvious.

If there s standing water it s not pitched properly. 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. Get 7 or 8 inch gutters.

You can measure pitch with a 2 foot level and a tape measure. The standard is about inch per 10 feet. Gutters need to be pitched toward the downspouts for the water to flow properly. Increase the pitch of the gutter.

The detail can be formed using preformed polymer based products traditional lead work or more modern lead replacement flashings. Pitched roofs have peaks and valleys that direct water downward in very specific directions. Once you know pitch you can find your roof pitch factor in the table below. Get on a ladder after a rainstorm and look in the gutter.

Flat roofs operate with the same basic principle but of course their lower angles mean that gravity isn t quite as effective in shedding water rapidly.