Shape, Size, Seamless
Homeowners will have two main gutter shapes to choose from: half-round and K-style. A smaller K-style gutter will drain the same amount of water as a larger half-round gutter. Half-round (also called U-shape) gutters are typically considered a traditional shape, as this was the original gutter shape dating back to the early 1900′s. K-style gutters didn’t emerge as an option until around the 1950s. Downspouts generally come in round or rectangular shapes.
When it comes to size, a homeowner will have to choose from gutter size (the measurement of the top opening), downspout size (length and width or diameter), and thickness. The most common gutter sizes are 5 inches and 6 inches, although 4 inches is available as well. Downspouts are commonly 2 x 3 inches and 3 x 4 inches in size or 3 or 4 inches in diameter.
When determining the size of a home’s gutter system, a homeowner should consider the area’s rainfall density. Such facts can usually be found on gutter supply websites. A home that sees a lot of rain or has a steep roof pitch should have a larger gutter system. Similarly, a home surrounded by tall trees will need a larger system to accommodate falling leaves without clogging.
Thickness is rated differently, depending on the material used. A thicker gutter system will be sturdier, more durable, and more expensive. Aluminum systems range from .019 to .032 inches in thickness. Copper is usually rated in weight, with a heavier weight indicating greater thickness. It is common to see 16-ounce and 20-ounce options for copper systems. Steel may be rated in inch-thickness or gauge.
Finally, a homeowner will have to decide between a sectional or seamless system. Traditionally, gutters came in sections that had to be pieced together, leaving seams. Today’s aluminum sectional systems require gutter sealant at the seams to prevent leakage. This sealant usually has to be re-applied as regular maintenance. Sectional copper or steel systems are actually soldered together at the seams, eliminating the need for a sealant. Proper installation of a sectional copper or steel system should include soldering, although some installers will use a metal sealant. Seamless systems are growing in popularity, and require professional installers. In a seamless system, an installer will use a special machine on-site to form long stretches of gutter (usually copper or aluminum) that will run the length of the roofline without a seam.