Designing Gutter Downspout System

When installing a gutter downspout drainage system be sure to avoid some of the common mistakes made.

Designing gutter downspout system. The area of roof contributing runoff to each gutter and downspout should be determined. The above sizing is reflected in the development of figure 4 downspout outlet sizing leader pipe sizing. Cross off any edge that isn t at the bottom of a slope. The standard is about inch per 10 feet.

The above recommendations. Increasing the pitch increases a gutter s. The amerimax home products flex a spout downspout extension has the amerimax home products flex a spout downspout extension has a rigid corrugated design for versatility. Use the factor of 1 05 from table 2 to adjust the roof plan area for the 4 12 roof pitch.

Featuring durable vinyl construction this extension can be buried bent or connected to additional sections. Gutters and downspouts do a great job of handling water run off from the roof but you also need to think about how your downspout drainage system is performing. Once all the parts of the drainage system were installed we covered the tubes with several inches of rock. The issue is soil.

Where the tube passes by the downspout from the gutter we installed a y fitting and drained the roof water from the gutter system directly into the main drainage line. Design area for pitched roofs. Increase the pitch of the gutter. Get 7 or 8 inch gutters.

Some downspouts simply can t move the water far enough away from your house on their own. Assume a level rectangular gutter with a depth to width ratio of 0 75. Usually your gutter contractor will decide between 5 inch gutters with 2 by 3 inch downspouts or. The map needs to be as close to scale as possible.

A 4 x 5 downspout can also fit but again some trimming of the flange of the preformed downspout outlet may be required. An amateur may only consider the length of the roof s edge when planning a gutter installation. That line eventually emptied into the low spot in the back yard. Remember a gutter downspout system is a containment sy.

You have three options. Some soil absorbs and drains the water very well so a downspout that diverts water just a few inches away from your home. Design a gutter downspout system for a 40 by 80 foot free stall barn located near folsom la with a 4 12 gable roof. The maximum accumulation of rainfall occurs when it falls perpendicular to the roof plane.

A little water will fall off these edges but not enough. Draw a map of your roof on a piece of paper. How to design a gutter downspout system step 1. A 6 inch top width k style gutter can receive a 3 x 4 downspout.

They ll cost more and probably require a custom order through a professional installer. On the 80 foot long roof assume two down spouts on each side.