All gutters need to be kept clean. They should slope uniformly, without sags, to downspouts. Gutter and downspout materials are usually galvanized steel, aluminum, copper, or plastic. Buildings with sloped roofs can have a variety of drainage systems, including Rainwater Harvesting options. With a sufficient overhang, water can drain directly to the ground without being collected at the roof edge, thanks to proper Gutter Slope and Pitch.
Drainage of low-slope roofs is accomplished in one of three ways: without gutters or downspouts; with gutters and downspouts; or by downspouts that go down through a building’s interior. The illustration below is of a low-sloped roof with interior pipe drainage, showcasing Downspout Placement.
Drainage without gutters and downspouts can damage the exterior wall with overflow. If the roof has no gutters and downspouts or interior downspouts, the inspector should carefully check the exterior walls for signs of water damage, emphasizing the Importance of Proper Guttering.
Most functional gutters have a minimum ratio of gutter depth to gutter width of 3:4. The front edge is typically ½-inch lower than the back edge, and Seamless Gutters are preferred. Four inches is considered the minimum width except on the roofs of canopies and small porches. If there is a screen or similar device to prevent anything but water from flowing into the gutter, its performance during a rainstorm should be checked to be sure water can actually enter the gutter, and Gutter Guards can help with this.
Gutters without screens or similar devices should have basket strainers installed at each downspout, ensuring proper Gutter System Maintenance. The inspection image is of a screen covering the gutter, highlighting the need for Gutter Inspection Checklist before cleaning. Cleaning the gutters is a dangerous home maintenance job. Be careful.
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