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how many downspouts do I need on a 45 foot gutter

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Posted 2013-10-18T17:25:03+0000  by bb10 bb10
 

thank you that is really helpful !

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Posted 2013-10-19T20:32:17+0000  by bb10

Hello bb10 and welcome to the community!

 

 

The number of downspouts can be determined by the surface square feet of your roof. Once you add up the square footage of your roof you can then determine the number of downspouts. 

 

For example: 3200 square feet of roof is calculated as 3200/600= 5.33, rounding up you would need 6 2x3 downspouts 

 

or 3200 square feet of roof is calculated as 3200/1200=2.67, rounding up you would need 3 3x4 downspouts 

 

One 2x3 Downspout will drain 600 sq. Ft. of roof area.
One 3x4 Downspout will drain 1200 sq. Ft. of roof area.

 

If I could do it all over again, I would have used 3x4 size downspouts, the 2x3 size just can't handle these 100 year storms. 

Posted 2013-10-18T20:14:53+0000  by Angelo_HD_CHI
 
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