Choosing Rain Gutters: Wood, Metal, or Plastic?
Help keep water where it belongs
Roofs shed a surprisingly large volume of rainwater. Gutters can be a nuisance, but they're an important first line of defense in keeping water away from the house and out of the basement.
Gutters are available in a variety of materials, styles, and price ranges, but sizing them correctly is a key consideration.
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LOOK FOR SOMETHING THAT WILL LAST
Several types of gutter hangers are available
There are two key issues when hanging gutters: how well the hanger and fastener will support the gutter; and how easy the hangers are to install. Options include straps nailed to the roof, hidden brackets with integral screws, snap-lock hangers that are attached to the house before the gutters are installed ,and ribbed aluminum spikes that are driven through the gutter and supported by ferrules.
Snap-lock hangers support the gutter from below as well as above, so they offer more support. That's a factor in snow country, but these hangers also are more time consuming to install.
Hidden hangers are popular with installers. Using integral hex-head screw makes installing these hangers easier, and they're often a first choice with gutter contractors who typically work with K-style aluminum gutters. Hangers can be snapped into place on the ground, so there's less fumbling for tools on the ladder.
Gutters should be attached to rafter (or truss) tails, not just 1x fascia. When roof framing is on 24-inch centers, Rhode Island builder Mike Guertin fastens gutters to each rafter tail. For framing on 16-inch centers, he uses every other rafter tail.
Do you need gutters, and if so, how can they work harder?
Are they necessary? The answer depends on your climate. If you get a lot of rainfall, or you don’t get a lot annually, but when it comes, it all comes at once, then gutters may be essential. Consider other solutions, such as the Frank Lloyd Wrightian rain chain, gravel trenches under the eave line (which also complement a fire-safe zone strategy), or even partial gutters at strategic locations, such as over entryways.
Gutters are often an afterthought —something that's just tacked on at the end of the job. They might still do their job if addressed in this way, but you may be missing some great opportunities.
Gutters are water-collection systems. A gutter's main job is usually collecting and diverting water to prevent problems. Why not use the same system to solve some? Clean water is a resource that is getting harder to come by. Municipal water authorities use a lot of electricity to move and process water. Diverting rainwater into a cistern for reuse instead of into a storm drain can address both of these issues. If you don't have the space or money to install a system for collecting, storing, and processing rain for drinking water, at least consider using simple rain barrels to collect it for irrigation. Stormwater could also be used to directly irrigate a rain garden.
Gutter positioning is key to functionality and durability
Good installation details can increase the chance that gutters make it through the winter. Snow and ice sliding off a roof can tear off the gutters in just a season or two. Keep the outer edge of the gutter lower than the plane of the roof.
Sloping gutters by 1/16 of an inch per foot will prevent debris from collecting in the bottom. Avoid spikes and furrules and other hangers that prevent natural expansion and contraction. Use expansion joints on runs longer than 40 feet.
Consider running downspouts into rain barrels or cisterns and using the collected water for irrigation.
Section 801.3 of the IRCInternational Residential Code. The one- and two-family dwelling model building code copyrighted by the International Code Council. The IRC is meant to be a stand-alone code compatible with the three national building codes—the Building Officials and Code Administrators (BOCA) National code, the Southern Building Code Congress International (SBCCI) code and the International Conference of Building Officials (ICBO) code. requires gutters and downspouts on structures located in areas where expansive or collapsible soils are known to exist. The section specifies that roof water be discharged at least five feet from the foundation or to an approved drainage system.
ABOUT RAIN GUTTERS
Your choice: half-round or ogee
The two most common gutter profiles are half-round and the so-called K-style, which comes with an ogee profile. Contractors who produce seamless gutters with on-site forming machines are most likely to offer the K-style. Half-round gutters are available in lengths of 10 feet and up and assembled on-site. They can be ordered or bought locally in several materials.
Inexpensive aluminum or PVC gutters can look tacky on a well-designed house with handsome exterior trim. Since attractive alternatives like copper are so expensive, omitting gutters entirely may be tempting in some situations. If that's the case, installing a perimeter ground gutter around the house topped with gravel may be an alternative for controlling runoff.
ABOUT TYPES OF GUTTERS
Size and cosmetic considerations aside, the chief question is what material to choose. Choices involve durability, cost, aesthetic, and environmental trade-offs. Materials that can be recycled easily are preferable.
An earth-friendly material, but wood gutters will need more maintenance than other materials and may not last as long as plastic or metal. High-quality cedar, redwood, and Douglas fir are expensive and getting harder to find.
Easy to recycle and can be formed into seamless lengths that don’t leak. Aluminum also is corrosion resistant. Limited style choices are one drawback.
Strong and dent resistant. For rust protection, steel gutters can be galvanized with zinc, coated with Galvalume (zinc and aluminum), or terne (tin and lead). Simple galvanized gutters are relatively inexpensive and long-wearing, and can be recycled.
Elegant-looking, durable, easy to recycle, and very expensive. Sections can be soldered together for leakproof installations or made from coil stock into seamless gutters. Unfortunately, rainwater can leach copper from roofs and gutters and carry it into local waterways, where it may harm to aquatic creatures. It's not known how much copper as a green material in a residential gutter and downspout system actually contributes to the environment, but copper leachate is a consideration.
Light, durable, and won’t rust. Sections up to 10 feet long must be joined with gaskets or cement, and the connections are prone to leaking. PVC also has some environmental disadvantages, including low recyclability and toxic emissions during manufacture and when incinerated.
- Dan Thornton/Fine Homebuilding #177
- Andy Engel/Fine Homebuilding #125
- Charles Bickford/Fine Homebuilding #187
- Dan Thornton/Fine Homebuilding #125