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400 sq ft per drop is a very good general rule of thumb, seldom is this used. Most folks think like using a extention cord, you can circle the earth and it will still work. If you have sparrows, trees, or dislike the cleaning gutter job, I would probably put in three. Not that it is needed, just if one gets plugged the water will most likley drain. Klower in Dubuque Ia, is the biggest in our area for making eve spouts. The K style is the most popular, and a eve bracket is the simplest to install by yoursef. We usualy avoid the stupid splices, just overlap the joints. We also use some over the roof hangers to sweeten the deal. Some company makes a open sided down spout that will never plug with leaves or ice. I can not think of the company right now. A inch per ten is a good rule of thumb, any steeper and it does not carry the crud. I know that continuous gutters made on the job site is popular, We get numerous calls to fix them each year. They tend to be pretty light duty. Most of those companies are a new good deal, yesterday I was selling used cars and today I is a selling seamless gutters. Usualy refered to as the trailer house version of eve spouts in our area. The wind always goes to a trailer court first, and a seamless gutter next. Most gutter failure is designed into the instalation. Cost cutting, lack of experiance, and hit and run contractors are the biggest factors.
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