Can I Use a 3x4 Downspout With a 5 Inch Gutter
Nosotros frequently hear from homeowners seeking answers to repair and maintenance issues. Many of these questions and answers are compiled in our Dwelling house Improvement Library. Hither is a recent question. 
Question
I accept a 41 foot span of guttering across the dorsum of my villa that has only one down spout. The gutters overflow during heavy rain storms. The downwards spout is ii×3 inch. Do you think the solution is adding another downwardly spout or replacing the 2×three" with a 3×4", or both? Likewise do you have any experience with gutter embrace products sold at the hardware stores?
Respond
You are right nearly wanting another downspout, because a business firm does need ane downspout per 40' span for proper drainage. At Mosby Edifice Arts, we install vi" gutters with three×four" downspouts because we discover very few instances of gutters that piece of work properly for the long haul with a 2×3" downspout. Please keep in mind that when enlarging the downspout you will as well need to enlarge the pigsty in the bottom of the gutter, also. And adding the second downward spout will crave adjusting or re-sloping the gutter. Currently, the whole span of gutter is likely sloping toward the existing unmarried down spout. With an boosted downspout, they will need to be adjusted so that the high point of the gutter is in the middle of the 41' span, sloping downhill in both directions toward both down spouts. Nosotros also recommend using pop rivets rather than screws and then less droppings catches within the organization causing menstruation restrictions. 
5" gutters typically go the ii×iii" downspout, and then be aware that if you add together 3×4" downspouts to 5" gutters, it will look very odd. Since work must be done to add your boosted, larger downspout, at present would be the best time to switch out to six" gutters, also. To protect your foundation and basement, please make certain to properly drain the downward spouts a minimum of 10 feet away from the house, or pipe the water underground. If you choose the underground method, use only smooth-walled PVC pipe. Please avoid the corrugated black drain pipes as they tin can create unnecessary blockages. Every bit to gutter cover products, we recommend and apply the Leafguard Gutters. The one-slice system protects the roof material and the roof warranty because it does not connect or jamb under the shingles which sometimes causes roof leak problems. We are not fans of gutter covers that are inserted into existing gutters. Many of the blockage problems St. Louis homes experience can be taken care of with 6" gutters with the proper number of 3×4" downspouts. Simply if a retro-fit of existing gutters with covers is the only option, we prefer Shur Flo, considering information technology's an aluminum tray, which gives far ameliorate performance than plastic or galvanized steel. Please be aware that this method of covering gutters can create a whole new prepare of drainage and maintenance issues, which is why nosotros adopt an all-in-one, integrated system. For assistance with your gutter organisation, or for any h2o and moisture repair issues in your dwelling house, we're here to assistance. In the Metro St. Louis surface area, please call the Mosby Building Arts office at 314.909.1800 or contact us here.
Source: https://mosbybuildingarts.com/qa-should-i-add-another-downspout-to-my-gutters/#:~:text=5%E2%80%9D%20gutters%20typically%20get%20the,6%E2%80%9D%20gutters%2C%20as%20well.
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