Rain Gutter Downspout Spacing

Downspouts are an important element to the design and function of your rain flow and gutter system.

Rain gutter downspout spacing.

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. The rain intensity according to table 1 2 rainfall data and drainage factors uses a 5 minute duration for a 10 year or 100 year storm thereby providing a worst case scenario for the downspout and gutter design. Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. Without perfectly working downspouts rainwater will fall off the roofs edge and may cause flooding and damage to the building.

Downspout sizes must not exceed the bottom width of the gutter. Featuring durable vinyl construction this extension can be buried bent or connected to additional sections. Downspout sizes are based on table 1 3 dimensions of standard downspouts page 1 4 of the architectural sheet metal manual 7th edition. Come visit our selection of quality products.

When water accumulates around the home s foundation it creates puddles and eventually can cause major leaks and cracks within the foundation walls. Rectangular downspouts move slightly less water at 600 square feet for 2 by 3 inch or 1 200 square feet for a 3 by 4 inch downspout. Welcome to gutter supply your online reference for gutters gutter machines gutter guards and accessories. Every home should have some sort of system designed to move the water away from the roof line and the home.

With 1 gpm 0 063 l s flow rate. Proper placement of gutter downspouts is one of the most important components of ensuring a gutter system is effective. Downspouts and gutters are sized in relation to rainfall on this basis. Rain water will pass through the cracks in the walls windows and into the buildings foundation.

The steeper a roof s pitch the more windblown rain it can collect. You can measure pitch with a 2 foot level and a tape measure. Plumbing codes typically use the vertically projected roof area for drainage design and they often use a square foot allowance per square inch of downspout for 1 in hr 25 mm hr rainfall that varies with diameter for example 3. Downspouts are most commonly seen attached to the corners of home or building.