You should try to limit the number of downspouts. The number is really determined by the length of gutter run. If the length is over 25-30 feet you may need a downspout at each end. Otherwise you would not be able to get enough pitch or slope on the gutter for it to drain properly. Aslo look to place downspouts where the excess water can easily drain away the house and foundation.
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We need more information. Houses come in all sizes. How many square feet of foundation? What state are you in?
A house needs a roof because anything could just drop inside the house from the sky, and in some cases, it helps support the walls of the house.
This depends on several factors. 1) size of gutter 2) size of downspout 3) amount of roof area draining into gutter
insulation is important, because in order to keep your house nice and warm, and not freezingly cold, you need to insulate your house
Heck no you don't need a trap IF you don't mind carcinogenic and highly flammable fumes from entering the house Heck no you don't need a trap IF you don't mind carcinogenic and highly flammable fumes from entering the house