Calculating the size of gutters you need starts with determining the square footage of the gutter's drain area. Chuck Barringer, owner of M&M, mentioned that the longest seamless gutter he knew was 450 feet long and was hung by Theodore's Seamless Gutters in Ellsworth, Maine. If you already have gutters installed and need to replace some or all of the system, you can measure the existing gutters to determine their width. The Thompson Creek replacement gutter system even reduces the need for regular maintenance, as it includes hoods that filter out a large amount of common waste.
If you want to install a completely new gutter system, you'll need to take some measurements on the roof to understand which gutter size is best. The standard 5K gutter and the larger 6K style gutter are available for larger homes, steep roofs, and problem areas. To accurately calculate the size of gutters you need, you must first measure the square footage of the gutter's drain area. This will help you determine which type of gutter is best for your home.
Once you have this information, you can then measure the existing gutters or install a new system. Knowing the longest seamless gutter length can also help you decide which type of gutter is best for your home.