Rain Gutter Downspout Spacing

Downspouts and gutters are sized in relation to rainfall on this basis.

Rain gutter downspout spacing.

Featuring durable vinyl construction this extension can be buried bent or connected to additional sections. Welcome to gutter supply your online reference for gutters gutter machines gutter guards and accessories. Multiply the number of downspouts by square footage of each. The steeper a roof s pitch the more windblown rain it can collect.

Downspout sizes must not exceed the bottom width of the gutter. Rain water will pass through the cracks in the walls windows and into the buildings foundation. 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. 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.

Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. When water accumulates around the home s foundation it creates puddles and eventually can cause major leaks and cracks within the foundation walls. You can measure pitch with a 2 foot level and a tape measure. Downspout sizes are based on table 1 3 dimensions of standard downspouts page 1 4 of the architectural sheet metal manual 7th edition.

Proper placement of gutter downspouts is one of the most important components of ensuring a gutter system is effective. If the downspouts do not allow water to flow out of the gutter system freely and do not channel the water away from the home then the house could be susceptible to issues such as roof rot foundation damage and landscape erosion. Come visit our selection of quality products. With 1 gpm 0 063 l s flow rate.

Without perfectly working downspouts rainwater will fall off the roofs edge and may cause flooding and damage to the building. Every home should have some sort of system designed to move the water away from the roof line and the home. 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. 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.